| Diagnosis and Testing Refer to Wiring Diagrams Section 417-04, for schematic and connector information. Special Tool(s) | | Terminal probe kit 29-011A | Inspection and Checking NOTE:The generic electronic module (GEM) forms part of the central junction box (CJB). NOTE:If the generic electronic module (GEM) is changed, the new one must be reinitialised. For this purpose, the vehicle-specific data is read out of the module to be replaced using WDS and is transferred to the new module. REFER to: Module Configuration (418-01 Module Configuration, General Procedures), Generic Electronic Module (GEM) (419-10 Multifunction Electronic Modules, Removal and Installation). NOTE:Before reading out the vehicle-specific data, remake all the electrical connections to the module to be removed, so that communication between the module and WDS is ensured. - Verify the customer concern.
- Visually inspect for obvious signs of electrical damage.
Visual Inspection | Electrical | - Fuse(s)
- Bulb(s)
- Switches
- Electrical connector(s)
- Wiring harness
| - Resolve any obvious causes or concerns found during the visual inspection before carrying out any further tests.
- If the concern is not visually evident, refer to the Symptom Chart.
Symptom Chart Symptom Chart | Symptom | Possible Sources | Action | | Daytime running lamps (DRL) inoperative (dipped beam OK) | * Fuse(s) * Circuit(s) * Daytime running lamp relay * Resistance line * Central junction box (CJB) * Generic electronic module (GEM) | * | | Daytime running lamps on when the ignition is off | * Circuit(s) * Headlight switch * Dipped beam relay * Resistance line * Central junction box (CJB) * Generic electronic module (GEM) | * | | Parking lamps and number plate lamps inoperative with the daytime running lamps switched on. | * Circuit(s) * Headlight switch * Central junction box (CJB) * Generic electronic module (GEM) | * | System Checks NOTE:Use a digital multimeter for all electrical measurements. | PINPOINT TEST A : DAYTIME RUNNING LAMPS (DRL) INOPERATIVE (DIPPED BEAM OK) | | TEST CONDITIONS | DETAILS/RESULTS/ACTIONS | | A1: DETERMINE THE FAULT CONDITION | | | 1 Ignition switch in position II. | | | 2 CHECK parking lamps and licence plate lamps. | | | Are parking lamps and licence plate lamps operative? Yes - Vehicles with conventional headlamps: GO to A2. - Vehicles with gas discharge headlamps: GO to A8. No - Parking lamps or license plate lamps inoperative:
REFER to: Parkleuchten, Rückleuchten, Kennzeichenleuchten - 3-Türer (417-01 Außenbeleuchtung, Diagnosis and Testing).
- Parking lamps and license plate lamps inoperative: GO to Pinpoint Test C. | | A2: CHECK THE HEADLIGHT SWITCH | | | 1 Ignition switch in position 0. | | | 2 Disconnect Headlight switch from connector C320. | | | 3 Using a fused bridging cable (7.5 A) at the headlight switch, connect between connector C320, pin 8, circuit 15-LE29 (GN/BK) and pin 4, circuit 15S-LE42 (GN/RD), wiring harness side. | | | 4 Ignition switch in position II. | | | 5 CHECK the low beams. | | | Is the dipped beam lit up with reduced intensity? Yes INSTALL A NEW headlight switch. CHECK the operation of the system. No | | A3: CHECK THE VOLTAGE SUPPLY OF THE DAYTIME RUNNING LIGHT RELAY AT PIN 1 | | | 1 Ignition switch in position 0. | | | 2 Connect Headlight switch with connector C320. | | | 3 Disconnect DRL relay from socket C1015. | | | 4 Ignition switch in position II. | | | 5 Measure the voltage between the DRL relay, socket C1015, pin 1, CJB side and ground. | | | Does the meter display battery voltage? Yes No LOCATE and RECTIFY the break in the circuit between the headlight switch and the DRL relay using the Wiring Diagrams, if necessary CHECK and RENEW the CJB. CHECK the operation of the system. | | A4: CHECK THE VOLTAGE SUPPLY OF THE DAYTIME RUNNING LIGHT RELAY AT PIN 3 | | | 1 Measure the voltage between the DRL relay, socket C1015, pin 3, CJB side and ground. | | | Does the meter display battery voltage? Yes No RENEW the CJB. CHECK the operation of the system. | | A5: CHECK GROUND CONNECTION OF THE DAYTIME RUNNING LIGHTS RELAY | | | 1 Ignition switch in position 0. | | | 2 Measure the resistance between the DRL relay, socket C1015, pin 2, CJB side and ground. | | | Is the resistance less than 2 ohms? Yes No LOCATE and RECTIFY the break in the circuit between the DRL relay and soldered connection S6 using the Wiring Diagrams. CHECK the operation of the system. | | A6: CHECK THE DRL RELAY | | | 1 Connect a fused (20 A) bridging cable at the DRL relay, socket C1015, between pin 3 and pin 5, CJB side. | | | 2 Ignition switch in position II. | | | 3 CHECK the low beams. | | | Is the dipped beam lit up with reduced intensity? Yes RENEW the DRL relay. CHECK the operation of the system. No | | A7: CHECK RESISTANCE LINE 15S-LE8 (GN/RD) FOR OPEN CIRCUIT | | | 1 Ignition switch in position 0. | | | 2 Disconnect CJB from connector C96. | | | 3 Measure the resistance between the resistance line, connector C96, pin 26, circuit 15S-LE8 (GN/RD), wiring harness side and pin 1, circuit 15S-LE8 (GN/RD), wiring harness side. | | | Is the resistance greater than 10,000 Ohms? Yes LOCATE and RECTIFY the break in resistance line 15S-LE8 (GN/RD) with the aid of the Wiring Diagrams. CHECK the operation of the system. No CHECK and if necessary INSTALL A NEW CJB. CHECK the operation of the system. | | A8: CHECK THE HEADLIGHT SWITCH | | | 1 Ignition switch in position 0. | | | 2 Disconnect Headlight switch from connector C320. | | | 3 Using a fused bridging cable (7.5 A) at the headlight switch, connect between connector C320, pin 8, circuit 15-LE29 (GN/BK) and pin 4, circuit 15S-LE42 (GN/RD), wiring harness side. | | | 4 Ignition switch in position II. | | | 5 Check the daytime running lamps. | | | Are the daytime running lamps illuminated? Yes INSTALL A NEW headlight switch. CHECK the operation of the system. No | | A9: CHECK THE CONTROL LINE OF THE DAYTIME RUNNING LIGHTS AT THE CENTRAL JUNCTION BOX | | | 1 Ignition switch in position 0. | | | 2 Connect Headlight switch with connector C320. | | | 3 Disconnect CJB from connector C103. | | | 4 Ignition switch in position II. | | | 5 Measure the voltage between the CJB, connector C103, pin 5, circuit 15S-LE42 (GN/RD), CJB side and ground. | | | Does the meter display battery voltage? Yes RENEW the CJB. CHECK the operation of the system. No LOCATE and RECTIFY the break in the circuit between the headlight switch and CJB using the wiring diagrams. CHECK the operation of the system. | | PINPOINT TEST B : DAYTIME RUNNING LAMPS SWITCHED ON WITH THE IGNITION SWITCHED OFF. | | TEST CONDITIONS | DETAILS/RESULTS/ACTIONS | | B1: DETERMINE THE FAULT CONDITION | | | 1 Ignition switch in position 0. | | | 2 CHECK the dipped beam, parking lamps and license plate lamps. | | | Do dipped beam, parking lamps and license plate lamps illuminate continuously? Yes No Dipped beam illuminates continuously:
REFER to: Scheinwerfer (417-01 Außenbeleuchtung, Diagnosis and Testing).
Diminished dipped beam permanently on: GO to B2. | | B2: RULE OUT THE DAYTIME RUNNING LAMP RELAY AS A POSSIBLE CAUSE OF THE FAULT | | | 1 Disconnect Daytime running lamp relay from socket C1015. | | | 2 CHECK the headlamps. | | | Are the headlamps lit with less intensity? Yes LOCATE and RECTIFY the short to battery voltage in circuit 15S-LE8 (GN/RD) (resistance line) with the aid of the Wiring Diagrams. CHECK the operation of the system. If necessary CHECK and RENEW the CJB. CHECK the operation of the system. No RENEW the daytime running lamp relay. CHECK the operation of the system. | | B3: NARROW DOWN THE FAULT CONDITION | | | 1 Disconnect Headlight switch from connector C320. | | | 2 Check the daytime running lamps (DRL). | | | Are the daytime running lamps (DRL) permanently lit? Yes - Vehicles with conventional headlamps: GO to B4. - vehicles with gas discharge headlamps: LOCATE and RECTIFY short to battery voltage in circuit 15S-LE42 (GN/RD) between headlight switch and CJB using the wiring diagrams. If necessary CHECK and RENEW the CJB. CHECK the operation of the system. No - The parking lamps or license plate lamps illuminate continuously:
REFER to: Parkleuchten, Rückleuchten, Kennzeichenleuchten - 3-Türer (417-01 Außenbeleuchtung, Diagnosis and Testing).
- The daytime running lamps (DRL) no longer come on: GO to B6. | | B4: CHECK CIRCUIT 15S-LE42 (GN/RD) FOR SHORT TO BATTERY VOLTAGE | | | 1 Disconnect CJB from connector C103. | | | 2 Measure the voltage between headlamp switch, connector C320, pin 4, circuit 15S-LE42 (GN/RD), wiring harness side and ground. | | | Does the meter display battery voltage? Yes LOCATE and RECTIFY the short to battery voltage in the circuit between the CJB and the headlamp switch using the Wiring Diagrams. CHECK the operation of the system. No | | B5: CHECK DAYTIME RUNNING RELAY PIN 1 IN THE CENTRAL JUNCTION BOX FOR SHORT TO BATTERY VOLTAGE | | | 1 Disconnect DRL relay from socket C1015. | | | 2 Measure the voltage between the DRL relay, socket C1015, pin 1, CJB side and ground. | | | Does the meter display battery voltage? Yes RENEW the CJB. CHECK the operation of the system. No RENEW the daytime running lamp relay. CHECK the operation of the system. | | B6: CHECK HEADLAMP SWITCH FOR SHORT TO BATTERY VOLTAGE | | | 1 Measure the voltage at the headlight switch, connector C320, pin 8, circuit 15-LE29 (GN/BK), wiring harness side and ground. | | | Does the meter display battery voltage? Yes No INSTALL A NEW headlight switch. CHECK the operation of the system. | | B7: CHECK CIRCUIT 15-LE29 (GN/BK) FOR SHORT TO BATTERY VOLTAGE | | | 1 Disconnect CJB from connector C102. | | | 2 Measure the voltage at the headlight switch, connector C320, pin 8, circuit 15-LE29 (GN/BK), 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 CJB, connector C102, pin 13 using the Wiring Diagrams. CHECK the operation of the system. No | | B8: CHECK IGNITION SWITCH FOR SHORT TO BATTERY VOLTAGE | | | 1 Measure the voltage at the CJB, connector C102, pin 36, circuit 15-DA1 (GN/YE), wiring harness side and ground. | | | Does the meter display battery voltage? Yes No | | B9: CHECK CIRCUIT 15-DA1 (GN/YE) FOR SHORT TO BATTERY VOLTAGE | | | 1 Disconnect Ignition switch from connector C456. | | | 2 Measure the voltage at the CJB, connector C102, pin 36, circuit 15-DA1 (GN/YE), wiring harness side and ground. | | | Does the meter display battery voltage? Yes LOCATE and RECTIFY the short to battery voltage in the circuit between the ignition switch and CJB using the Wiring Diagrams. CHECK the operation of the system. No RENEW the ignition switch. CHECK the operation of the system. | | B10: CHECK CIRCUIT 15-LE6 (GN/YE) FOR SHORT TO BATTERY VOLTAGE | | | 1 Measure the voltage at the CJB, connector C102, pin 15, circuit 15-LE6 (GN/YE), wiring harness side and ground. | | | Does the meter display battery voltage? Yes LOCATE and RECTIFY the short to battery voltage in the circuit between the CJB and the headlamp switch using the Wiring Diagrams. CHECK the operation of the system. No RENEW the CJB. CHECK the operation of the system. | | PINPOINT TEST C : PARKING LAMPS AND NUMBER PLATE LAMPS INOPERATIVE WITH DAYTIME RUNNING LAMPS LIT. | | TEST CONDITIONS | DETAILS/RESULTS/ACTIONS | | C1: DETERMINE THE EQUIPMENT LEVEL OF THE CENTRAL JUNCTION BOX (CJB). | | | 1 Unfasten the CJB and fold it down. | | | Is the location for connector C100 on the top of the CJB? Yes No | | C2: CHECK FUSE F110 (CJB) | | | 1 Ignition switch in position 0. | | | 2 Disconnect Fuse F110 (10 A) (CJB). | | | 3 CHECK Fuse F110 (10 A) (CJB). | | | Is the fuse OK.? Yes No RENEW fuse F110 (10 A) (CJB). 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. | | C3: CHECK VOLTAGE AT FUSE F110 (CJB) | | | 1 Connect Fuse F110 (10 A) (CJB). | | | 2 Ignition switch in position II. | | | 3 Measure the voltage between fuse F110 (10 A) (CJB) and ground. | | | Does the meter display battery voltage? Yes No LOCATE and RECTIFY the break in the voltage supply to fuse F71 (CJB) using the Wiring Diagrams. CHECK the operation of the system. If necessary CHECK and RENEW the CJB. CHECK the operation of the system. | | C4: CHECK FUSE F71 (CJB) | | | 1 Ignition switch in position 0. | | | 2 Disconnect fuse F71 (10 A) (CJB). | | | 3 CHECK fuse F71 (10 A) (CJB). | | | Is the fuse OK.? Yes No RENEW fuse F71 (10 A). 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. | | C5: CHECK THE VOLTAGE AT FUSE F71 (CJB) | | | 1 Connect fuse F71 (10 A) (CJB). | | | 2 Ignition switch in position II. | | | 3 Measure the voltage between fuse F71 (10 A) (CJB) and ground. | | | Does the meter display battery voltage? Yes No LOCATE and RECTIFY the break in the voltage supply to fuse F71 (CJB) using the Wiring Diagrams. CHECK the operation of the system. If necessary CHECK and RENEW the CJB. CHECK the operation of the system. | | C6: CHECK THE HEADLIGHT SWITCH | | | 1 Ignition switch in position 0. | | | 2 Disconnect Headlight switch from connector C320. | | | 3 Ignition switch in position II. | | | 4 Measure the voltage between the headlight switch, connector C320, pin 15, circuit 15-LE6 (GN/YE), wiring harness side and ground. | | | Does the meter display battery voltage? Yes INSTALL A NEW headlight switch. CHECK the operation of the system. No | | C7: CHECK VOLTAGE SUPPLY TO THE HEADLIGHT SWITCH FOR OPEN CIRCUIT | | | 1 Ignition switch in position 0. | | | 2 Disconnect CJB from connector C102. | | | 3 Measure the resistance between CJB, connector C102, pin 15, circuit 15-LE6 (GN/YE), wiring harness side and headlight switch, connector C320, pin 15, circuit 15-LE6 (GN/YE), wiring harness side. | | | Is the resistance less than 2 ohms? Yes RENEW the CJB. CHECK the operation of the system. No LOCATE and RECTIFY the break in the circuit between the CJB and the headlight switch using the wiring diagrams. CHECK the operation of the system. | |
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