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S-MAX.Galaxy 2006.5 (03.2006-)

Exterior Lighting - Headlamp Leveling S-MAX/Galaxy 2006.5 (03/2006-)
Diagnosis and Testing

Refer to Wiring Diagrams Section 417-01, for schematic and connector information.

Special Tool(s)

Terminal Probe Kit

29-011A

Inspection and Testing

NOTE:
NOTE:The generic electronic module (GEM) is part of the central junction box (CJB).
NOTE:
NOTE:If a new GEM module is being installed, the new module must be configured following installation. For this purpose, the vehicle-specific data or the data to be changed is read out of the module using WDS and is transferred to the new module. REFER to:
Modul-Konfiguration (418-01, General Procedures),
Zentralelektrikmodul (GEM) (419-10, Diagnosis and Testing).
NOTE:
NOTE:Before reading out the vehicle-specific data make sure that all electrical connections in the vehicle are reconnected so that the module and WDS can communicate correctly.
  1. Verify the customer concern.
  1. Visually inspect for obvious signs of electrical damage.

Visual Inspection Chart

Electrical systems
  • Fuse(s)
  • Bulb(s)
  • Connector
  • Switch
  • Wiring loom
  1. Resolve any obvious causes or concerns found during the visual inspection before carrying out any further tests.
  1. If the cause of the concern cannot be found by visual inspection, continue with the symptom chart.

Symptom chart

Symptom chart

Symptom Possible Sources Action
The headlamp levelling is inoperative/does not operate correctly (vehicles with conventional headlamps)
*
Fuse(s)
*
Circuit(s)
*
Lighting control module
*
Adaptive front lighting module
*
Headlamp
*
Central Junction Box (CJB)
*
GO to Pinpoint Test A.
The headlamp levelling is inoperative/does not operate correctly (vehicles with xenon headlamps)
*
Fuse(s)
*
Circuit(s)
*
Headlamp levelling motor.
*
Xenon headlamps
*
Headlamp levelling front sensor
*
Headlamp levelling rear sensor
*
Adaptive front lighting module
*
Central Junction Box (CJB)
*
GO to Pinpoint Test B.

Pinpoint test

NOTE:
NOTE:Use a digital multimeter for all measurements.

PINPOINT TEST A : THE HEADLAMP LEVELLING IS INOPERATIVE/DOES NOT OPERATE CORRECTLY (VEHICLES WITH CONVENTIONAL HEADLAMPS)
TEST CONDITIONS DETAILS/RESULTS/ACTIONS
A1: DETERMINE THE CAUSE OF THE FAULT
1
Ignition switch in position II.
2
SWITCH ON dipped beam.
3
ADJUST the headlamp levelling (UP/DOWN).
4
CHECK the headlamp levelling.

Is the headlamp levelling left-hand side and right-hand side inoperative?
Yes
GO to A2.
No
- Left-hand headlamp levelling inoperative: GO to A19.
- Right-hand headlamp levelling inoperative: GO to A22.
A2: CHECK FUSE F43 (5 A) (EJB)
1
Ignition switch in position 0.
2
Disconnect fuse F43 (5 A) (EJB).
3
CHECK fuse F43 (5 A) (EJB).

Is the fuse OK.?
Yes
GO to A3.
No
RENEW fuse F43 (5 A) (EJB). CHECK the operation of the system. If the fuse blows again, LOCATE and RECTIFY the short to ground using the Wiring Diagrams. CHECK the operation of the system.
A3: CHECK THE VOLTAGE SUPPLY TO FUSE F43 (5 A) (EJB)
1
Connect fuse F43 (5 A) (EJB).
2
Ignition switch in position II.
3
Measure the voltage between fuse F43 (5A) (EJB) and ground.

Does the meter display battery voltage?
Yes
- vehicles without adaptive front lighting module: GO to A6.
- vehicles with adaptive front lighting module: GO to A4.
No
LOCATE AND RECTIFY the break in the voltage supply of fuse F43 (5 A) (EJB) using the Wiring Diagrams. CHECK the operation of the system.
A4: CHECK FUSE F39 (15 A) (EJB)
1
Ignition switch in position 0.
2
Disconnect fuse F39 (15 A) (EJB).
3
CHECK fuse F39 (15 A) (EJB).

Is the fuse OK.?
Yes
GO to A5.
No
RENEW fuse F39 (15 A) (EJB). CHECK the operation of the system. If the fuse blows again, LOCATE and RECTIFY the short to ground using the Wiring Diagrams. CHECK the operation of the system.
A5: CHECK THE VOLTAGE SUPPLY TO FUSE F39 (15 A) (EJB)
1
Connect fuse F39 (15 A) (EJB).
2
Ignition switch in position II.
3
Measure the voltage between fuse F39 (15 A) (EJB) and ground.

Does the meter display battery voltage?
Yes
GO to A6.
No
LOCATE AND RECTIFY the break in the voltage supply of fuse F39 (15 A) (EJB) using the Wiring Diagrams. CHECK the operation of the system.
A6: CHECK THE COMMON VOLTAGE SUPPLY OF THE HEADLAMP LEVELLING MOTORS FOR OPEN CIRCUIT
1
Ignition switch in position 0.
2
Disconnect Left-hand headlamp from connector C1LF08.
3
Ignition switch in position II.
4
Measure the voltage between left-hand headlamp, connector C1LF08, pin 1, circuit CBB43B (GY), wiring harness side and ground.

Does the meter display battery voltage?
Yes
GO to A7.
No
LOCATE and RECTIFY the break in circuits between fuse F43 (5 A) (EJB) and soldered connection SP171 using the Wiring Diagrams. CHECK the operation of the system.
A7: CHECK THE COMMON CONTROL CIRCUIT FOR HEADLAMP LEVELLING FOR SHORT TO BATTERY VOLTAGE
1
Ignition switch in position 0.
2
Disconnect Right-hand headlamp from connector C1LF09.
3
Disconnect Lighting control module from connector C2LF23D.
4
Disconnect Vehicles with adaptive front lighting module: Adaptive front lighting module from connector C2LF23A.
5
Ignition switch in position II.

6
Measure the voltage between the lighting control module, connector C2LF23D, pin 4:
  • Vehicles without adaptive front lighting module: circuit VLF22B (VT/GN), wiring harness side and ground.
  • Vehicles with adaptive front lighting module: circuit A_VLF22A (VT/GN), wiring harness side and ground.

Does the meter display battery voltage?
Yes
LOCATE and RECTIFY the short to battery voltage in the circuits connected to the lighting control module, connector C2LF23D, pin 4 using the Wiring Diagrams. CHECK the operation of the system.
No
- vehicles without adaptive front lighting module: GO to A12.
- vehicles with adaptive front lighting module: GO to A8.
A8: CHECK THE COMMON CONTROL CIRCUIT FOR HEADLAMP LEVELLING FOR SHORT TO BATTERY VOLTAGE

1
Measure the voltage between adaptive front lighting module, connector C2LF23A, pin 16, circuit VLF22E (VT/GN), wiring harness side and ground.

Does the meter display battery voltage?
Yes
LOCATE and RECTIFY the short to battery voltage in the circuits connected to the adaptive front lighting module, connector C2LF23A, pin 16 using the Wiring Diagrams. CHECK the operation of the system.
No
GO to A9.
A9: CHECK VOLTAGE SUPPLY TO ADAPTIVE FRONT LIGHTING MODULE FOR OPEN CIRCUIT

1
Measure the voltage between adaptive front lighting module, connector C2LF23A, pin 10, circuit CBB43C (GY), wiring harness side and ground.

Does the meter display battery voltage?
Yes
GO to A10.
No
LOCATE and RECTIFY break in circuit between soldered connection SP171 and adaptive front lighting module using the Wiring Diagrams. CHECK the operation of the system.
A10: CHECK VOLTAGE SUPPLY TO ADAPTIVE FRONT LIGHTING MODULE FOR OPEN CIRCUIT
1
Ignition switch in position 0.
2
Disconnect Adaptive front lighting module from connector C2LF23B.
3
Ignition switch in position II.
4
Measure the voltage between adaptive front lighting module, connector C2LF23B, pin 1, circuit CBB39D (VT/WH), wiring harness side and ground.
5
Measure the voltage between adaptive front lighting module, connector C2LF23B, pin 2, circuit CBB39G (VT/WH), wiring harness side and ground.

Is battery voltage measured in both cases?
Yes
GO to A11.
No
- If battery voltage is not measured during both of the measurements: LOCATE and RECTIFY the break in circuits between soldered connection SP174 and fuse F39 (15 A) (EJB) using the Wiring Diagrams. CHECK the operation of the system.
- If battery voltage is not measured during one of the measurements: LOCATE and RECTIFY break in the affected circuit between soldered connection SP174 and adaptive front lighting module using the Wiring Diagrams. CHECK the operation of the system.
A11: CHECK GROUND CONNECTION TO ADAPTIVE FRONT LIGHTING MODULE FOR OPEN CIRCUIT
1
Ignition switch in position 0.

2
Measure the resistance between adaptive front lighting module, connector C2LF23A, pin 1, circuit GD138BU (BK/WH), wiring harness side and ground.

Is a resistance of less than 2 Ohms registered?
Yes
GO to A12.
No
LOCATE and RECTIFY break in circuit between adaptive front lighting module and ground connection G6D139 using the Wiring Diagrams. CHECK the operation of the system.
A12: CHECK THE COMMON CONTROL CIRCUIT FOR HEADLAMP LEVELLING FOR SHORT TO GROUND
1
Ignition switch in position 0.

2
Measure the resistance between the lighting control module, connector C2LF23D, pin 4:
  • Vehicles without adaptive front lighting module: circuit VLF22B (VT/GN), wiring harness side and ground.
  • Vehicles with adaptive front lighting module: circuit A_VLF22A (VT/GN), wiring harness side and ground.

Is a resistance of more than 10,000 Ohm measured?
Yes
- vehicles without adaptive front lighting module: GO to A15. - vehicles with adaptive front lighting module: GO to A13.
No
LOCATE and RECTIFY the short to ground in the circuits connected to the lighting control module, connector C2LF23D, pin 4 using the Wiring Diagrams. CHECK the operation of the system.
A13: CHECK THE COMMON CONTROL CIRCUIT FOR HEADLAMP LEVELLING FOR SHORT TO GROUND

1
Measure the resistance between adaptive front lighting module, connector C2LF23A, pin 16, circuit VLF22E (VT/GN), wiring harness side and ground.

Is a resistance of more than 10,000 Ohm measured?
Yes
GO to A14.
No
LOCATE and RECTIFY the short to ground in the circuits connected to the adaptive front lighting module, connector C2LF23A, pin 16 using the Wiring Diagrams. CHECK the operation of the system.
A14: CHECK COMMON CONTROL CIRCUIT OF HEADLAMP LEVELLING FOR OPEN CIRCUIT

1
Measure the resistance between the lighting control module, connector C2LF23D, pin 4, circuit A_VLF22A (VT/GN), wiring harness side and adaptive front lighting module, connector C2LF23A, pin 9, circuit A_VLF22A (VT/GN), wiring harness side.
2
Measure the resistance between adaptive front lighting module, connector C2LF23A, pin 16, circuit VLF22E (VT/GN), wiring harness side and left-hand headlamp, connector C1LF08, pin 3, circuit VLF22A (VT/GN), wiring harness side.

Is a resistance of less than 2 Ohm measured in both cases?
Yes
GO to A16.
No
LOCATE and REPAIR the break in the affected circuit using the Wiring Diagrams. CHECK the operation of the system.
A15: CHECK COMMON CONTROL CIRCUIT OF HEADLAMP LEVELLING FOR OPEN CIRCUIT
1
Measure the resistance between adaptive front lighting module, connector C2LF23D, pin 4, circuit VLF22B (VT/GN), wiring harness side and left-hand headlamp, connector C1LF08, pin 3, circuit VLF22A (VT/GN), wiring harness side.

Is a resistance of less than 2 Ohms registered?
Yes
GO to A16.
No
LOCATE and RECTIFY break in circuit between lighting control module and intermediate connector C21A/B using the Wiring Diagrams. CHECK the operation of the system.
A16: RULE OUT THE LEFT-HAND HEADLAMP AS A POSSIBLE CAUSE OF THE FAULT
1
Connect Left-hand headlamp to connector C1LF08A.
2
Ignition switch in position II.

3
Vehicles without adaptive front lighting module: Measure the voltage between adaptive front lighting module, connector C2LF23D, pin 4, circuit VLF22B (VT/GN), wiring harness side and ground.

4
Vehicles with adaptive front lighting module: Measure the voltage between adaptive front lighting module, connector C2LF23A, pin 16, circuit VLF22E (VT/GN), wiring harness side and ground.

Does the meter display battery voltage?
Yes
RENEW left-hand headlamp. CHECK the operation of the system.
No
GO to A17.
A17: RULE OUT THE RIGHT-HAND HEADLAMP AS A POSSIBLE CAUSE OF THE FAULT
1
Ignition switch in position 0.
2
Connect Right-hand headlamp to connector C1LF09.
3
Ignition switch in position II.

4
Vehicles without adaptive front lighting module: Measure the voltage between adaptive front lighting module, connector C2LF23D, pin 4, circuit VLF22B (VT/GN), wiring harness side and ground.

5
Vehicles with adaptive front lighting module: Measure the voltage between adaptive front lighting module, connector C2LF23A, pin 16, circuit VLF22E (VT/GN), wiring harness side and ground.

Does the meter display battery voltage?
Yes
RENEW right-hand headlamp. CHECK the operation of the system.
No
- vehicles without adaptive front lighting module: RENEW lighting control module. CHECK the operation of the system.
- vehicles with adaptive front lighting module: GO to A18.
A18: RULE OUT THE LIGHTING CONTROL MODULE AS A POSSIBLE SOURCE OF THE FAULT.
1
Ignition switch in position 0.
2
Connect Lighting control module to connector C2LF23D.
3
Ignition switch in position II.
4
SWITCH ON dipped beam.
5
OPERATE the headlamp levelling (UP/DOWN).

6
Measure the voltage between adaptive front lighting module, connector C2LF23A, pin 9, circuit A_VLF22A (VT/GN), wiring harness side and ground.

Does the voltage measurement change in line with the headlamp levelling position.
Yes
RENEW adaptive front lighting module. CHECK the operation of the system.
No
RENEW lighting control module. CHECK the operation of the system.
A19: CHECK VOLTAGE SUPPLY OF LEFT-HAND HEADLAMP LEVELLING MOTOR FOR OPEN CIRCUIT
1
Ignition switch in position 0.
2
Disconnect Left-hand headlamp from connector C1LF08.
3
Ignition switch in position II.
4
SWITCH ON dipped beam.
5
Measure the voltage between left-hand headlamp, connector C1LF08, pin 1, circuit CBB43B (GY), wiring harness side and ground.

Does the meter display battery voltage?
Yes
GO to A20.
No
LOCATE and RECTIFY the break in the circuit between soldered connection SP171 and headlamp using the Wiring Diagrams. CHECK the operation of the system.
A20: CHECK GROUND CONNECTION OF LEFT-HAND HEADLAMP LEVELLING MOTOR FOR OPEN CIRCUIT
1
Ignition switch in position 0.
2
Measure the resistance between the left-hand headlamp, connector C1LF08, pin 11, circuit GD130AE (BK/YE), wiring harness side and ground.

Is a resistance of less than 2 Ohms registered?
Yes
GO to A21.
No
LOCATE and RECTIFY the break in the circuit between the headlamp and soldered connection SP371 using the Wiring Diagrams. CHECK the operation of the system.
A21: CHECK CONTROL CIRCUIT OF LEFT-HAND HEADLAMP LEVELLING MOTOR FOR OPEN CIRCUIT
1
Disconnect Right-hand headlamp from connector C1LF09.
2
Measure the resistance between left-hand headlamp, connector C1LF08, pin 3, circuit VLF22A (VT/GN), wiring harness side and right-hand headlamp, connector C1LF09, pin 3, circuit VLF22C (VT/GN), wiring harness side.

Is a resistance of less than 2 Ohms registered?
Yes
RENEW left-hand headlamp. CHECK the operation of the system.
No
LOCATE and RECTIFY break in circuit between headlamp and intermediate connector C21A/B using the Wiring Diagrams. CHECK the operation of the system.
A22: CHECK VOLTAGE SUPPLY OF RIGHT-HAND HEADLAMP LEVELLING MOTOR FOR OPEN CIRCUIT
1
Ignition switch in position 0.
2
Disconnect Right-hand headlamp from connector C1LF09.
3
Ignition switch in position II.
4
SWITCH ON dipped beam.
5
Measure the voltage between right-hand headlamp, connector C1LF09, pin 1, circuit CBB43A (GY), wiring harness side and ground.

Does the meter display battery voltage?
Yes
GO to A23.
No
LOCATE and RECTIFY the break in the circuit between soldered connection SP171 and headlamp using the Wiring Diagrams. CHECK the operation of the system.
A23: CHECK GROUND CONNECTION OF RIGHT-HAND HEADLAMP LEVELLING MOTOR FOR OPEN CIRCUIT
1
Ignition switch in position 0.
2
Measure the resistance between the right-hand headlamp, connector C1LF09, pin 11, circuit GD132W (BK/VT), wiring harness side and ground.

Is a resistance of less than 2 Ohms registered?
Yes
GO to A24.
No
LOCATE and RECTIFY the break in the circuit between the headlamp and soldered connection SP380 using the Wiring Diagrams. CHECK the operation of the system.
A24: CHECK CONTROL CIRCUIT OF RIGHT-HAND HEADLAMP LEVELLING MOTOR FOR OPEN CIRCUIT
1
Disconnect Left-hand headlamp from connector C1LF08.
2
Measure the resistance between left-hand headlamp, connector C1LF08, pin 3, circuit VLF22A (VT/GN), wiring harness side and right-hand headlamp, connector C1LF09, pin 3, circuit VLF22C (VT/GN), wiring harness side.

Is a resistance of less than 2 Ohms registered?
Yes
RENEW headlamp. CHECK the operation of the system.
No
LOCATE and RECTIFY break in circuit between headlamp and intermediate connector C21A/B using the Wiring Diagrams. CHECK the operation of the system.

PINPOINT TEST B : THE HEADLAMP LEVELLING IS INOPERATIVE/DOES NOT OPERATE CORRECTLY (VEHICLES WITH XENON HEADLAMPS)
WARNING:
WARNING:High voltages of up to 30 kV are present in the system. Ensure that the headlamp assembly electrical connector is disconnected if the headlamp assembly is removed.
NOTE:
NOTE:It is not possible to adjust the headlamps manually.
NOTE:
NOTE:For testing the basic function of the automatic headlamp levelling system, switch on the dipped beams and change the load (rear axle) of the vehicle. Check if the headlamp levelling system adjusts the headlamps correctly.
NOTE:
NOTE:The headlamp levelling positioning motor cannot be replaced by itself. If necessary, it needs to be replaced together with the complete headlamp unit.
TEST CONDITIONS DETAILS/RESULTS/ACTIONS
B1: DETERMINE THE CAUSE OF THE FAULT
1
Ignition switch in position II.
2
SWITCH ON dipped beams.
3
CHECK the headlamp levelling.

Is the headlamp levelling left-hand side and right-hand side inoperative?
Yes
GO to B2.
No
- Left-hand headlamp levelling inoperative: GO to B25.
- Right-hand headlamp levelling inoperative: GO to B28.
B2: CHECK FUSE F43 (5 A) (EJB)
1
Ignition switch in position 0.
2
Disconnect fuse F43 (5 A) (EJB).
3
CHECK fuse F43 (5 A) (EJB).

Is the fuse OK.?
Yes
GO to B3.
No
RENEW fuse F43 (5 A) (EJB). CHECK the operation of the system. If the fuse blows again, LOCATE and RECTIFY the short to ground using the Wiring Diagrams. CHECK the operation of the system.
B3: CHECK THE VOLTAGE SUPPLY TO FUSE F43 (5 A) (EJB)
1
Connect fuse F43 (5 A) (EJB).
2
Ignition switch in position II.
3
Measure the voltage between fuse F43 (5A) (EJB) and ground.

Does the meter display battery voltage?
Yes
GO to B4.
No
LOCATE AND RECTIFY the break in the voltage supply of fuse F43 (5 A) (EJB) using the Wiring Diagrams. CHECK the operation of the system.
B4: CHECK FUSE F39 (15 A) (EJB)
1
Ignition switch in position 0.
2
Disconnect fuse F39 (15 A) (EJB).
3
CHECK fuse F39 (15 A) (EJB).

Is the fuse OK.?
Yes
GO to B5.
No
RENEW fuse F39 (15 A) (EJB). CHECK the operation of the system. If the fuse blows again, LOCATE and RECTIFY the short to ground using the Wiring Diagrams. CHECK the operation of the system.
B5: CHECK THE VOLTAGE SUPPLY TO FUSE F39 (15 A) (EJB)
1
Connect fuse F39 (15 A) (EJB).
2
Ignition switch in position II.
3
Measure the voltage between fuse F39 (15 A) (EJB) and ground.

Does the meter display battery voltage?
Yes
GO to B6.
No
LOCATE AND RECTIFY the break in the voltage supply of fuse F39 (15 A) (EJB) using the Wiring Diagrams. CHECK the operation of the system.
B6: CHECK THE COMMON VOLTAGE SUPPLY OF THE HEADLAMP LEVELLING MOTORS FOR OPEN CIRCUIT
1
Ignition switch in position 0.
2
Disconnect Left-hand headlamp from connector C1LF08.
3
Ignition switch in position II.
4
Measure the voltage between left-hand headlamp, connector C1LF08, pin 13, circuit (VT/WH), wiring harness side and ground.

Does the meter display battery voltage?
Yes
GO to B7.
No
LOCATE and RECTIFY the break in circuit between fuse F39 (15 A) (EJB) and soldered connection SP172 using the Wiring Diagrams. CHECK the operation of the system.
B7: CHECK VOLTAGE SUPPLY TO ADAPTIVE FRONT LIGHTING MODULE FOR OPEN CIRCUIT
1
Ignition switch in position 0.
2
Disconnect Adaptive front lighting module from connector C2LF23A.
3
Ignition switch in position II.

4
Measure the voltage between adaptive front lighting module, connector C2LF23A, pin 10, circuit CBB43C (GY), wiring harness side and ground.

Does the meter display battery voltage?
Yes
GO to B8.
No
LOCATE and RECTIFY break in circuit between soldered connection SP171 and adaptive front lighting module using the Wiring Diagrams. CHECK the operation of the system.
B8: CHECK VOLTAGE SUPPLY TO ADAPTIVE FRONT LIGHTING MODULE FOR OPEN CIRCUIT
1
Ignition switch in position 0.
2
Disconnect Adaptive front lighting module from connector C2LF23B.
3
Ignition switch in position II.
4
Measure the voltage between adaptive front lighting module, connector C2LF23B, pin 1, circuit CBB39D (VT/WH), wiring harness side and ground.
5
Measure the voltage between adaptive front lighting module, connector C2LF23B, pin 2, circuit CBB39G (VT/WH), wiring harness side and ground.

Is battery voltage measured in both cases?
Yes
GO to B9.
No
- If battery voltage is not measured during both of the measurements: LOCATE and RECTIFY the break in circuits between soldered connection SP174 and fuse F39 (15 A) (EJB) using the Wiring Diagrams. CHECK the operation of the system.
- If battery voltage is not measured during one of the measurements: LOCATE and RECTIFY break in the affected circuit between soldered connection SP174 and adaptive front lighting module using the Wiring Diagrams. CHECK the operation of the system.
B9: CHECK GROUND CONNECTION TO ADAPTIVE FRONT LIGHTING MODULE FOR OPEN CIRCUIT
1
Ignition switch in position 0.

2
Measure the resistance between adaptive front lighting module, connector C2LF23A, pin 1, circuit GD138BU (BK/WH), wiring harness side and ground.

Is a resistance of less than 2 Ohms registered?
Yes
GO to B10.
No
LOCATE and RECTIFY break in circuit between adaptive front lighting module and ground connection G6D139 using the Wiring Diagrams. CHECK the operation of the system.
B10: CHECK LIN DATABUS CONNECTION BETWEEN ADAPTIVE FRONT LIGHTING MODULE AND HEADLAMP LEVELLING MOTOR FOR SHORT CIRCUIT TO BATTERY VOLTAGE
1
Ignition switch in position II.

2
Measure the voltage between adaptive front lighting module, connector C2LF23A, pin 17, circuit VLF32B (YE), wiring harness side and ground.

Does the meter display battery voltage?
Yes
LOCATE and RECTIFY the short to battery voltage in circuits between adaptive front lighting module and headlamp levelling motor using the Wiring Diagrams. CHECK the operation of the system.
No
GO to B11.
B11: CHECK LIN DATABUS CONNECTION BETWEEN ADAPTIVE FRONT LIGHTING MODULE AND HEADLAMP LEVELLING MOTOR FOR SHORT CIRCUIT TO GROUND
1
Ignition switch in position 0.

2
Measure the resistance between adaptive front lighting module, connector C2LF23A, pin 17, circuit VLF32B (YE), wiring harness side and ground.

Is a resistance of more than 10,000 Ohm measured?
Yes
GO to B12.
No
LOCATE and RECTIFY the short to ground in circuits between adaptive front lighting module and headlamp levelling motor using the Wiring Diagrams. CHECK the operation of the system.
B12: CHECK LIN DATABUS CONNECTION BETWEEN ADAPTIVE FRONT LIGHTING MODULE AND HEADLAMP LEVELLING MOTOR FOR OPEN CIRCUIT
1
Measure the resistance between adaptive front lighting module, connector C2LF23A, pin 17, circuit VLF32B (YE), wiring harness side and left-hand headlamp levelling motor, connector C1LF08, pin 14, circuit VLF32A (YE), wiring harness side.

Is a resistance of less than 2 Ohms registered?
Yes
GO to B13.
No
LOCATE and RECTIFY break in circuits between adaptive front lighting module and intermediate connector C21A/B using the Wiring Diagrams. CHECK the operation of the system.
B13: CHECK FRONT HEADLAMP LEVELLING SENSOR
1
Disconnect Front headlamp levelling sensor from connector C5CD07.
2
Check the front headlamp levelling sensor in accordance with the Component Checks in this operation.

Is the front headlamp levelling sensor OK?
Yes
GO to B14.
No
INSTALL a new front headlamp levelling sensor. CHECK the operation of the system.
B14: CHECK REAR HEADLAMP LEVELLING SENSOR
1
Disconnect Rear headlamp levelling sensor from connector C7CD12.
2
Check the rear headlamp levelling sensor in accordance with the Component Checks in this operation.

Is the rear headlamp levelling sensor OK?
Yes
GO to B15.
No
INSTALL a new rear headlamp levelling sensor. CHECK the operation of the system.
B15: CHECK THE VOLTAGE SUPPLY TO THE HEADLAMP LEVELLING SENSORS FOR OPEN CIRCUIT
1
Connect Adaptive front lighting module to connector C2LF23A.
2
Connect Adaptive front lighting module to connector C2LF23B.
3
Ignition switch in position II.
4
SWITCH ON dipped beam.

5
Measure the voltage between front headlamp levelling sensor, connector C5CD07, pin 5, circuit LCD23B (GN/OG), wiring harness side and ground.

6
Measure the voltage between rear headlamp levelling sensor, connector C7CD12, pin 5, circuit LCD23D (GN/OG), wiring harness side and ground.

Is a voltage of 5 Volts measured in both cases?
Yes
GO to B17.
No
- If no voltage is measured during both of the measurements: GO to B16.
- Is a voltage of 5 Volts measured during just one measurement? LOCATE and RECTIFY break in the affected circuit between soldered connection SP406 and headlamp levelling sensor using the Wiring Diagrams. CHECK the operation of the system.
B16: RULE OUT THE ADAPTIVE FRONT LIGHTING MODULE AS A POSSIBLE CAUSE OF THE FAULT
1
Ignition switch in position 0.
2
Disconnect Adaptive front lighting module from connector C2LF23A.

3
Measure the resistance between adaptive front lighting module, connector C2LF23A, pin 11, circuit LCD23G (GN/OG), wiring harness side and front headlamp levelling sensor, connector C5CD07, pin 5, circuit LCD23B (GN/OG), wiring harness side.

Is a resistance of less than 2 Ohms registered?
Yes
RENEW the adaptive front lighting module. CHECK the operation of the system.
No
LOCATE and RECTIFY break in circuit between adaptive front lighting module and soldered connection SP406 using the Wiring Diagrams. CHECK the operation of the system.
B17: RULE OUT THE ADAPTIVE FRONT LIGHTING MODULE AS A POSSIBLE CAUSE OF THE FAULT
1
Ignition switch in position II.

2
Measure the resistance between front headlamp levelling sensor, connector C5CD07, pin 1, circuit RCD02G (GN/BN), wiring harness side and ground.

3
Measure the resistance between rear headlamp levelling sensor, connector C7CD12, pin 1, circuit RCD23D (WH/BN), wiring harness side and ground.

Is a resistance of less than 2 Ohm measured in both cases?
Yes
GO to B19.
No
- If a resistance of less than 2 Ohm is not measured in either measurement: RENEW the adaptive front lighting module. CHECK the operation of the system.
- If a resistance of less than 2 Ohm is measured in one measurement: GO to B18.
B18: RULE OUT THE ADAPTIVE FRONT LIGHTING MODULE AS A POSSIBLE CAUSE OF THE FAULT
1
Ignition switch in position 0.
2
Disconnect Adaptive front lighting module from connector C2LF23A.

3
Open circuit in ground connection to front headlamp levelling sensor: Measure the resistance between adaptive front lighting module, connector C2LF23A, pin 12, circuit RCD02L (GN/BN), wiring harness side and front headlamp levelling sensor, connector C5CD07, pin 1, circuit RCD02G (GN/BN), wiring harness side.

4
Open circuit in ground connection to rear headlamp levelling sensor: Measure the resistance between adaptive front lighting module, connector C2LF23A, pin 3, circuit RCD23K (WH/BN), wiring harness side and rear headlamp levelling sensor, connector C7CD12, pin 1, circuit RCD23D (WH/BN), wiring harness side.

Is a resistance of less than 2 Ohms registered?
Yes
RENEW the adaptive front lighting module. CHECK the operation of the system.
No
LOCATE and RECTIFY break in circuit between adaptive front lighting module and headlamp levelling sensor using the Wiring Diagrams. CHECK the operation of the system.
B19: CHECK SIGNAL CIRCUIT BETWEEN ADAPTIVE FRONT LIGHTING MODULE AND FRONT HEADLAMP LEVELLING SENSOR FOR SHORT CIRCUIT TO BATTERY VOLTAGE
1
Ignition switch in position II.

2
Measure the voltage between front headlamp levelling sensor, connector C5CD07, pin 4, circuit VCD10B (BN), wiring harness side and ground.

Does the meter display battery voltage?
Yes
LOCATE and RECTIFY the short to battery voltage in circuit(s) between adaptive front lighting module and headlamp levelling sensor using the Wiring Diagrams. CHECK the operation of the system.
No
GO to B20.
B20: CHECK SIGNAL CIRCUIT BETWEEN ADAPTIVE FRONT LIGHTING MODULE AND FRONT HEADLAMP LEVELLING SENSOR FOR SHORT CIRCUIT TO GROUND
1
Ignition switch in position 0.

2
Measure the resistance between front headlamp levelling sensor, connector C5CD07, pin 4, circuit VCD10B (BN), wiring harness side and ground.

Is a resistance of more than 10,000 Ohm measured?
Yes
GO to B21.
No
LOCATE and RECTIFY the short to ground in circuit(s) between adaptive front lighting module and headlamp levelling sensor using the Wiring Diagrams. CHECK the operation of the system.
B21: CHECK SIGNAL CIRCUIT BETWEEN ADAPTIVE FRONT LIGHTING MODULE AND FRONT HEADLAMP LEVELLING SENSOR FOR OPEN CIRCUIT

1
Measure the resistance between the front headlamp levelling sensor, connector C5CD07, pin 4, circuit VCD10B (BN), wiring harness side and adaptive front lighting module, connector C2LF23A, pin 15, circuit VCD10D (BN), wiring harness side.

Is a resistance of less than 2 Ohms registered?
Yes
GO to B22.
No
LOCATE and RECTIFY break in circuit(s) between adaptive front lighting module and headlamp levelling sensor using the Wiring Diagrams. CHECK the operation of the system.
B22: CHECK SIGNAL CIRCUIT BETWEEN ADAPTIVE FRONT LIGHTING MODULE AND REAR HEADLAMP LEVELLING SENSOR FOR SHORT CIRCUIT TO BATTERY VOLTAGE
1
Ignition switch in position II.

2
Measure the voltage between rear headlamp levelling sensor, connector C7CD12, pin 4, circuit VCD12B (VT/WH), wiring harness side and ground.

Does the meter display battery voltage?
Yes
LOCATE and RECTIFY the short to battery voltage in circuit(s) between adaptive front lighting module and headlamp levelling sensor using the Wiring Diagrams. CHECK the operation of the system.
No
GO to B23.
B23: CHECK SIGNAL CIRCUIT BETWEEN ADAPTIVE FRONT LIGHTING MODULE AND REAR HEADLAMP LEVELLING SENSOR FOR SHORT CIRCUIT TO GROUND

1
Measure the resistance between rear headlamp levelling sensor, connector C7CD12, pin 4, circuit VCD12B (VT/WH), wiring harness side and ground.

Is a resistance of more than 10,000 Ohm measured?
Yes
GO to B24.
No
LOCATE and RECTIFY the short to ground in circuit(s) between adaptive front lighting module and headlamp levelling sensor using the Wiring Diagrams. CHECK the operation of the system.
B24: CHECK SIGNAL CIRCUIT BETWEEN ADAPTIVE FRONT LIGHTING MODULE AND REAR HEADLAMP LEVELLING SENSOR FOR OPEN CIRCUIT

1
Measure the resistance between the rear headlamp levelling sensor, connector C7CD12, pin 4, circuit VCD12B (VT/WH), wiring harness side and adaptive front lighting module, connector C2LF23A, pin 6, circuit VCD12C (VT/WH), wiring harness side.

Is a resistance of less than 2 Ohms registered?
Yes
RENEW the adaptive front lighting module. CHECK the operation of the system.
No
LOCATE and RECTIFY break in circuit(s) between adaptive front lighting module and headlamp levelling sensor using the Wiring Diagrams. CHECK the operation of the system.
B25: CHECK VOLTAGE SUPPLY OF LEFT-HAND HEADLAMP LEVELLING MOTOR FOR OPEN CIRCUIT
1
Ignition switch in position 0.
2
Disconnect Left-hand headlamp from connector C1LF08.
3
Ignition switch in position II.
4
SWITCH ON dipped beam.
5
Measure the voltage between left-hand headlamp, connector C1LF08, pin 13, circuit CBB39E (VT/WH), wiring harness side and ground.

Does the meter display battery voltage?
Yes
GO to B26.
No
LOCATE and RECTIFY break in circuit between soldered connection SP172 and headlamp using the Wiring Diagrams. CHECK the operation of the system.
B26: CHECK GROUND CONNECTION OF LEFT-HAND HEADLAMP LEVELLING MOTOR FOR OPEN CIRCUIT
1
Ignition switch in position 0.
2
Measure the resistance between the left-hand headlamp, connector C1LF08, pin 11, circuit GD130AE (BK/YE), wiring harness side and ground.

Is a resistance of less than 2 Ohms registered?
Yes
GO to B27.
No
LOCATE and RECTIFY the break in the circuit between the headlamp and soldered connection SP371 using the Wiring Diagrams. CHECK the operation of the system.
B27: CHECK LIN DATABUS CONNECTION BETWEEN ADAPTIVE FRONT LIGHTING MODULE AND LEFT-HAND HEADLAMP FOR OPEN CIRCUIT
1
Disconnect Right-hand headlamp from connector C1LF09.
2
Measure resistance between left-hand headlamp, connector C1LF08, pin 14, circuit VLF32A (YE), wiring harness side and right-hand headlamp, connector C1LF09, pin 14, circuit VLF32C (YE), wiring harness side.

Is a resistance of less than 2 Ohms registered?
Yes
CHECK headlamp levelling motor. CHECK the operation of the system. If the concern persists, RENEW the headlamp. CHECK the operation of the system.
No
LOCATE and RECTIFY break in circuit between left-hand headlamp and intermediate connector C21A/B using the Wiring Diagrams. CHECK the operation of the system.
B28: CHECK VOLTAGE SUPPLY OF RIGHT-HAND HEADLAMP LEVELLING MOTOR FOR OPEN CIRCUIT
1
Ignition switch in position 0.
2
Disconnect Right-hand headlamp from connector C1LF09.
3
Ignition switch in position II.
4
SWITCH ON dipped beam.
5
Measure the voltage between right-hand headlamp, connector C1LF09, pin 13, circuit CBB39F (VT/WH), wiring harness side and ground.

Does the meter display battery voltage?
Yes
GO to B29.
No
LOCATE and RECTIFY break in circuit between soldered connection SP172 and headlamp using the Wiring Diagrams. CHECK the operation of the system.
B29: CHECK GROUND CONNECTION OF RIGHT-HAND HEADLAMP LEVELLING MOTOR FOR OPEN CIRCUIT
1
Ignition switch in position 0.
2
Measure the resistance between the right-hand headlamp, connector C1LF09, pin 11, circuit GD132W (BK/VT), wiring harness side and ground.

Is a resistance of less than 2 Ohms registered?
Yes
GO to B30.
No
LOCATE and RECTIFY the break in the circuit between the headlamp and soldered connection SP380 using the Wiring Diagrams. CHECK the operation of the system.
B30: CHECK THE LIN DATABUS CONNECTION FOR OPEN CIRCUIT
1
Disconnect Left-hand headlamp from connector C1LF08.
2
Measure resistance between left-hand headlamp, connector C1LF08, pin 14, circuit VLF32A (YE), wiring harness side and right-hand headlamp, connector C1LF09, pin 14, circuit VLF32C (YE), wiring harness side.

Is a resistance of less than 2 Ohms registered?
Yes
CHECK headlamp levelling motor. CHECK the operation of the system. If the concern persists, RENEW the headlamp. CHECK the operation of the system.
No
LOCATE and RECTIFY break in circuit between right-hand headlamp and intermediate connector C21A/B using the Wiring Diagrams. CHECK the operation of the system.

Component checks

HEADLAMP LEVELLING SENSOR

CAUTION:
CAUTION:Electronic modules are sensitive to electrical charge. If exposed to these charges, damage may result.
CAUTION:
CAUTION:Be sure, that the headlamp levelling sensor is supplied with exactly 5 volts.
NOTE:
NOTE:Check the headlamp levelling sensor when installed.
  • Switch off the ignition.
  • Disconnect the electrical connector.
  • Using an external 5 volts DC supply.
  • Using a digital multimeter.
  • Using a test cable, set up the test as in the following description.
  1. Check headlamp levelling sensor, front/rear.

  • Connect the positive terminal of the voltage supply with fused cable (5 A) to pin 5 of the headlamp levelling sensor and the negative terminal to pin 1.
  • To measure the voltage at the sensor, connect the positive terminal of the Digital Multimeter to pin 4 and the negative terminal to pin 1.
  • Change the vehicle load during the measurement.

Measure the voltage.

Is the range of values at the digital multimeter between 2.0 - 2.7 volts?

If yes, the headlamp levelling sensor is OK.

If no, RENEW the headlamp levelling sensor.

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