PINPOINT TEST A : DAYTIME RUNNING LAMPS (DRL) INOPERATIVE |
TEST CONDITIONS | DETAILS/RESULTS/ACTIONS |
A1: CHECK THE CAUSE OF THE FAULT |
| 1 Ignition switch in position II. |
| 2 Check parking lights and license plate lamps. |
| Are parking lights and license plate lamps operative? Yes No - Parking lights are inoperative: REFER to: Parkleuchten, Rückleuchten, Kennzeichenleuchten (417-01, Diagnosis and Testing). - Licence plate lamps are inoperative: REFER to: Parkleuchten, Rückleuchten, Kennzeichenleuchten (417-01, Diagnosis and Testing). - Parking lamps, license plate lamps and dipped beam inoperative: GO to A6. |
A2: CHECK THE VOLTAGE SUPPLY OF THE DIPPED BEAM RELAY |
| 1 Ignition switch in position 0. |
| 2 Disconnect Dipped beam relay from socket C901. |
| 3 Ignition switch in position II. |
| 4 Measure the voltage between the dipped beam relay: - Vehicles with conventional headlamps: socket C901, pin 5, circuit 15-LE19 (GN/BU), BJB side and ground.
- Vehicles with gas discharge headlamps: socket C901, pin 5, circuit 30-LE19 (RD), BJB side and ground.
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| Is battery voltage measured? Yes No - Vehicles with conventional headlamps: LOCATE and RECTIFY the break in the circuit between fuse F88 (CJB) and the dipped beam relay using the Wiring Diagrams. CHECK the operation of the system. - vehicles with gas discharge headlamps: LOCATE and REPAIR the break in the circuit using the Wiring Diagrams. CHECK the operation of the system. |
A3: CHECK THE CONTROL CIRCUIT OF THE DIPPED BEAM RELAY |
| 1 Measure the voltage between the dipped beam relay, socket C901, pin 2, circuit 15S-LE19 (GN/BU), BJB side and ground. |
| Is battery voltage measured? Yes No |
A4: CHECK THE GROUND CONNECTION OF THE DIPPED BEAM RELAY |
| 1 Ignition switch in position 0. |
| 2 Measure the resistance between the dipped beam relay, socket C901, pin 1, circuit 31-LE19 (BK), BJB side and ground. |
| Is a resistance of less than 2 Ohms registered? Yes No LOCATE and RECTIFY the break in the circuit between the dipped beam relay and soldered connection S315 using the Wiring Diagrams. CHECK the operation of the system. |
A5: CHECK THE DIPPED BEAM RELAY |
| 1 Use a fused test cable to bridge the dipped beam relay, socket C901, pin 3, circuit(s) 15S-LE23A (GN/WH)/ 15S-LE16A (GN/OG), and pin 5, circuit 15-LE19 (GN/BU), BJB side. - Vehicles with conventional headlamps: Fuse rating 15 A.
- Vehicles with gas discharge headlamps: Fuse rating 40 A.
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| 2 Ignition switch in position II. |
| 3 Check the dipped beam. |
| Does the dipped beam illuminate? Yes RENEW the dipped beam relay. CHECK the operation of the system. No REFER to: Scheinwerfer (417-01, Diagnosis and Testing). |
A6: CHECK THE VOLTAGE SUPPLY OF THE HEADLIGHT SWITCH |
| 1 Ignition switch in position 0. |
| 2 Disconnect Headlight switch from connector C478. |
| 3 Ignition switch in position II. |
| 4 Measure the voltage between the headlight switch, connector C478, pin 8, circuit(s) 15-LE10 (GN/OG)/15-LE21(A) (GN/BK), wiring harness side and ground. |
| Is battery voltage measured? Yes No |
A7: CHECK FUSE F88 (15 A) (CJB). |
| 1 Ignition switch in position 0. |
| 2 Disconnect Fuse F88 (15 A) (CJB). |
| 3 CHECK Fuse F88 (15 A) (CJB). |
| Is the fuse OK.? Yes No RENEW fuse F88 (15 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. |
A8: CHECK THE VOLTAGE AT FUSE F88 (15 A) (CJB) |
| 1 Connect Fuse F88 (15 A) (CJB). |
| 2 Ignition switch in position II. |
| 3 Measure the voltage between fuse F88 (15 A) (CJB) and ground. |
| Is battery voltage measured? Yes No LOCATE AND RECTIFY the break in the voltage supply of fuse F88 (15 A) (CJB) using the Wiring Diagrams. CHECK the operation of the system. If necessary RENEW the CJB. CHECK the operation of the system. |
A9: CHECK FOR OPEN CIRCUIT IN 15-LE21(A) (GN/BK) |
| 1 Ignition switch in position 0. |
| 2 Disconnect Central junction box (CJB) from connector C500. |
| 3 Measure the resistance between the CJB, connector C500, pin 7, circuit(s) 15-LE21 (GN/BK)/15-LE19 (GN/BU), wiring harness side and the headlight switch, connector C478, pin 8, circuit(s) 15-LE21A (GN/BK)/15-LE10 (GN/OG), wiring harness side. |
| Is a resistance of less than 2 Ohms registered? Yes RENEW the CJB. CHECK the operation of the system. No LOCATE and RECTIFY the break in circuit 15-LE21(A) (GN/BK), between the CJB and the headlight switch using the Wiring Diagrams. CHECK the operation of the system. |
A10: CHECK CIRCUIT 15S-LE19 FOR OPEN CIRCUIT |
| 1 Ignition switch in position 0. |
| 2 Disconnect Central junction box (CJB) from connector C509. |
| 3 Measure the resistance between the CJB, connector C509, pin 8, circuit(s) 15S-LE19 (GN/BU), 15S-KA22 (GN/BU), wiring harness side and the dipped beam relay, socket C901, pin 2, circuit 15S-LE19 (GN/BU), BJB side. |
| Is a resistance of less than 2 Ohms registered? Yes Check fuse F95 (CJB) If the fuse is OK, CHECK and if necessary RENEW the CJB. CHECK the operation of the system. No LOCATE and RECTIFY the break in circuit 15S-LE19 (GN/BU), between the CJB and the dipped beam relay using the Wiring Diagrams. CHECK the operation of the system. |
A11: CHECK FUSE F95 (7.5 A) (CJB). |
| 1 Ignition switch in position 0. |
| 2 Disconnect Fuse F95 (7.5 A) (CJB). |
| 3 CHECK Fuse F95 (7.5 A) (CJB). |
| Is the fuse OK.? Yes No RENEW fuse F95 (7.5 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. |
A12: CHECK THE VOLTAGE AT FUSE F95 (7.5 A) (CJB) |
| 1 Ignition switch in position 0. |
| 2 Connect Fuse F95 (7.5 A) (CJB). |
| 3 Ignition switch in position II. |
| 4 Measure the voltage between fuse F95 (7.5 A) (CJB) and ground. |
| Is battery voltage measured? Yes LOCATE and RECTIFY the break in circuit 15S-LE19 (GN/BU), between the fuse F95 (7.5 A) (CJB) and the dipped beam relay using the Wiring Diagrams. CHECK the operation of the system. If the concern persists, CHECK and if necessary RENEW the CJB. CHECK the operation of the system. No |
A13: CHECK THE CJB |
| 1 Ignition switch in position 0. |
| 2 Disconnect Central junction box (CJB) from C501. |
| 3 Ignition switch in position II. |
| 4 Measure the voltage between the CJB, connector C501, pin 4, circuit 15S-LE6 (GN/YE), wiring harness side and ground. |
| Is battery voltage measured? 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. |
A14: CHECK FUSE F84 (20 A) (CJB). |
| 1 Ignition switch in position 0. |
| 2 Disconnect Fuse F84 (20 A) (CJB). |
| 3 CHECK Fuse F84 (20 A) (CJB). |
| Is the fuse OK.? Yes No RENEW fuse F84 (20 A) (CJB). CHECK the operation of the system. If the fuse blows again, LOCATE and RECTIFY the short using the Wiring Diagrams. CHECK the operation of the system. |
A15: CHECK THE VOLTAGE AT FUSE F84 (20 A) (CJB) |
| 1 Connect Fuse F84 (20 A) (CJB). |
| 2 Ignition switch in position II. |
| 3 Measure the voltage between fuse F84 (20 A) (CJB) and ground. |
| Is battery voltage measured? Yes CHECK and if necessary RENEW the CJB. CHECK the operation of the system. No |
A16: CHECK CIRCUIT 15S-LE1 (GN/YE) FOR OPEN CIRCUIT |
| 1 Ignition switch in position 0. |
| 2 Disconnect Central junction box (CJB) from connector C501. |
| 3 Measure the resistance between the CJB, connector C501, pin 8, circuit 15S-LE1 (GN/YE), wiring harness side and the headlight switch, connector C478, pin 4, circuit 15S-LE1 (GN/YE), wiring harness side. |
| Is a resistance of less than 2 Ohms registered? Yes 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. |
A17: CHECK THE CJB |
| 1 Measure the resistance at the CJB, connector C501, between pin 8, circuit 15S-LE1 (GN/YE) and pin 4, circuit 15S-LE6 (GN/YE), CJB side. |
| Is a resistance of less than 2 Ohms registered? Yes RENEW the headlight switch. CHECK the operation of the system. No RENEW the CJB. CHECK the operation of the system. |
A18: CHECK THE HEADLIGHT SWITCH |
| 1 Ignition switch in position 0. |
| 2 Connect a fused jumper lead (15 A) to the headlight switch, connector C478, between pin 8, circuit 15-LE21A (GN/BK)/15-LE10 (GN/OG) and pin 4, circuit 15S-LE1 (GN/YE), wiring harness side. |
| 3 Ignition switch in position II. |
| 4 CHECK the operation of the dipped beam. |
| Does the dipped beam illuminate? Yes RENEW the headlight switch. CHECK the operation of the system. No |
A19: CHECK THE CONTROL CIRCUIT OF THE DAYTIME RUNNING LAMP RELAY |
| 1 Ignition switch in position 0. |
| 2 Connect Headlight switch to connector C478. |
| 3 Disconnect DRL relay from socket C514. |
| 4 Ignition switch in position II. |
| 5 Vehicles built up to 04/2005 |
| 6 Measure the voltage between daytime running lamp relay, socket C514, pin 2, circuit 15S-LE1 (GN/YE), wiring harness side and ground. |
| 7 Vehicles built from 04/2005 |
| 8 Measure the voltage between the daytime running lamp relay, socket C514, pin 2, circuit 15S-LE1 (GN/YE), wiring harness side and ground. |
| Is battery voltage measured? Yes No LOCATE and RECTIFY the break in the circuit between the headlight switch and the daytime running lamp relay using the Wiring Diagrams. CHECK the operation of the system. |
A20: CHECK THE GROUND CONNECTION OF THE DAYTIME RUNNING LAMP RELAY |
| 1 Ignition switch in position 0. |
| 2 Vehicles built up to 04/2005 |
| 3 Measure the resistance between the daytime running lamp relay, socket C514, pin 1, circuit 31-LE6 (BK), wiring harness side and ground. |
| 4 Vehicles built from 04/2005 |
| 5 Measure the resistance between the daytime running lamp relay, socket C514, pin 1, circuit 31-LE6 (BK), wiring harness side and ground. |
| Is a resistance of less than 2 Ohms registered? Yes No LOCATE and RECTIFY the break in the circuit between the daytime running lamp relay and soldered connection S116 using the Wiring Diagrams. CHECK the operation of the system. |
A21: CHECK THE VOLTAGE SUPPLY (LOAD CIRCUIT) TO THE DAYTIME RUNNING LAMP RELAY |
| 1 Ignition switch in position II. |
| 2 Vehicles built up to 04/2005 |
| 3 Measure the voltage between the daytime running lamp relay, socket C514, pin 5, circuit 15-KA22 (GN/BU), wiring harness side and ground. |
| 4 Vehicles built from 04/2005 |
| 5 Measure the voltage between the daytime running lamp relay, socket C514, pin 5, circuit 15-KA22 (GN/BU), wiring harness side and ground. |
| Is battery voltage measured? Yes No LOCATE and RECTIFY the break in the circuit between the DRL relay and soldered connection S145 using the Wiring Diagrams. CHECK the operation of the system. |
A22: CHECK THE DRL RELAY |
| 1 Ignition switch in position 0. |
| 2 Disconnect Headlight switch from connector C478. |
| 3 Vehicles built up to 04/2005 |
| 4 Using a fused bridging cable (15 A) at the daytime running lamp relay, connect between connector C514, pin 5, circuit 15-KA22 (GN/BU) and pin 3, circuit 15S-LE6A (GN/YE), wiring harness side. |
| 5 Vehicles built from 04/2005 |
| 6 Using a fused bridging cable (15 A) at the daytime running lamp relay, connect between connector C514, pin 5, circuit 15-KA22 (GN/BU) and pin 3, circuit 15S-LE6A (GN/YE), wiring harness side. |
| 7 Ignition switch in position II. |
| 8 Measure the voltage at the headlight switch, connector C478, pin 15, circuit 15S-LE6(A) (GN/YE), wiring harness side and ground. |
| Is battery voltage measured? Yes RENEW the DRL relay. CHECK the operation of the system. No LOCATE and RECTIFY the break in circuit 15S-LE6A (GN/YE) between the daytime running lamp relay and the headlight switch using the Wiring Diagrams. CHECK the operation of the system. |