Stoplights (vehicles before 08.2001) — Pinpoint tests

R1: CHECK FUSE F54

1 CHECK F54.

• Is the fuse good?

→ Yes

Go to R2

→ No

REPLACE fuse F54. If fuse F54 fails again, FIND and REPAIR the short circuit using the wiring diagrams. CHECK the system is working properly.

R2: CHECK THE VOLTAGE IN FUSE AREA F54

1 Drive the ON position.

2 Measure the voltage between fuse F54 and "weight".

• Does the meter show battery voltage?

→ Yes

Go to R3

→ No

Go to R9

R3: CHECK STOP LIGHT SWITCH VOLTAGE

1 Disconnect C444.

2 Drive the ON position.

3 Measure the voltage at pin 3 of C444,.

• Does the meter show battery voltage?

→ Yes

Go to R4

→ No

REPAIR circuit 15-LG23. CHECK the system is working properly.

R4: CHECK STOP LIGHT SWITCH

1 Disconnect C444.

2 Drive the ON position.

3 Use a suitable wire as a jumper between pins 3 and 1 of connector C444.

• Do the brake lights come on?

→ Yes

REPLACE brake light switch. CHECK the system is working properly.

→ No

Vehicles with Electronic Stability Program (ESP): Go to R5

Vehicles without Electronic Stability Program (ESP): REPAIR circuit 15S-LG14A (green-red) or 15S-LG14B (green-red). CHECK the system is working properly.

R5: INSPECT STOP LIGHT RELAY

1 Detach the CBJB.

2 Drive the ON position.

3 Depress the brake pedal.

4 Check the voltage on pin 3 of the C1014 BJB.

• Does the meter show battery voltage?

→ Yes

Go to R6

→ No

REPAIR circuit 15S-LG14B, 15S-CF58, or 15S-CF58A. CHECK the system is working properly.

R6: INSPECT STOP LIGHT RELAY

1 Detach C1014 BJB.

2 Drive the ON position.

3 Depress the brake pedal.

4 Use a suitable wire as a jumper between pins 3 and 4 of the C1014 BJB connector.

• Do the brake lights come on?

→ Yes

Go to R7

→ No

REPAIR circuit 15S-LG14A. CHECK the system is working properly.

R7: INSPECT STOP LIGHT RELAY

1 Detach C1014 BJB.

2 Drive the ON position.

3 Check the voltage on pin 1 of the C1014 BJB.

• Does the meter show battery voltage?

→ Yes

Go to R8

→ No

REPAIR circuit 15-CF58. CHECK the system is working properly.

R8: INSPECT STOP LIGHT RELAY

1 Detach C1014 BJB.

2 Using an ohmmeter, measure the resistance between pin 2 of the C1014 BJB connector and "weight".

• Is the measured resistance less than 2 ohms?

→ Yes

REPLACE brake light relay. CHECK the system is working properly.

→ No

REPAIR circuit 31S-CF71 if necessary REPLACE electronic stability program module (ESP). CHECK the system is working properly.

R9: CHECK POWER SUPPLY

1 Disconnect Fuse F1.

2 CHECK Fuse F1.

• Is fuse F1 in BJB OK?

→ Yes

Go to R10

→ No

REPLACE fuse F1. If fuse F1 fails again, FIND and REPAIR the short circuit using the wiring diagrams. CHECK the system is working properly.

R10: CHECK POWER SUPPLY

1 Drive the ON position.

2 Measure the voltage at fuse F1.

• Does the meter show battery voltage?

→ Yes

REPAIR circuit 15-DA3 if necessary REPLACE CJB. CHECK the system is working properly.

→ No

REPAIR circuit 15-DC1 if necessary REPLACE ignition relay. CHECK the system is working properly.

S1: CHECK OPTIONAL STOP LIGHT

1 Drive the ON position.

2 Depress the brake pedal.

• Does the auxiliary brake light come on?

→ Yes

Go to S4

→ No

Go to S2

S2: INSPECT ELECTRICAL CIRCUIT 15S-LG6

1 Enter the OFF position.

2 Disconnect C107 additional brake lights.

3 Drive the ON position.

4 Depress the brake pedal.

5 Check voltage between C107 accessory brake light connector pin 1, circuit 15S-LG6 (green-yellow), from the wiring side, and "weight".

• Does the meter show battery voltage?

→ Yes

Go to S3

→ No

REPAIR circuit 15S-LG6. CHECK the system is working properly.

S3: INSPECT 31-LG6 GAS ELECTRICAL CIRCUIT

1 Enter the OFF position.

2 Check resistance between C107 auxiliary brake light connector pin 2, circuit 31-LG6 (black), from the wiring side, and "weight".

• Is the resistance less than 2 ohms?

→ Yes

After checking the bulb, REPLACE the auxiliary brake light. CHECK the system is working properly.

→ No

REPAIR 31-LG6 fouling circuit. CHECK the system is working properly.

S4: CHECK THE STOP LIGHTS

1 Check the operation of the brake lights.

• Are both brake lights not working?

→ Yes

REPAIR circuit 15S-LG14 (green-red), and/or REPAIR solder points S154 or S212. CHECK the system is working properly.

→ No

Right brake light not working: Go to S5

Left brake light not working: Go to S7

S5: CHECK ELECTRICAL CIRCUIT 15S-LG21

1 Enter the OFF position.

2 Disconnect the C473, C475 and/or C477 of the right rear light assembly.

3 Drive the ON position.

4 Check the voltage between the right tail lamp assembly, circuit 15S-LG21 (green-black), from the wiring side, and "weight".

- 3-/5-door options: pin 2 C473

- 4-door variant: pin 2 C477

- "station wagon": pin 1 C475

• Does the meter show battery voltage?

→ Yes

Go to S6

→ No

REPAIR circuit 15S-LG21. CHECK the system is working properly.

S6: CHECK 31-LF24 / 31-LF4 ELECTRICAL GROUND CIRCUIT

1 Enter the OFF position.

2 Measure the resistance between the right tail light assembly, circuit 31-LF24 (black), 31-LF4, wiring side, and "weight".

- 3-/5-door options: pin 3 C473

- 4-door variant: pin 4 C477

- "station wagon": pin 3 C475

• Is the resistance less than 2 ohms?

→ Yes

After checking the bulb, REPLACE the right rear light assembly. CHECK the system is working properly.

→ No

REPAIR the 31-LF24 / 31-LF4 ground circuit. CHECK the system is working properly.

S7: CHECK ELECTRICAL CIRCUIT 15S-LG14A

1 Enter the OFF position.

2 Disconnect the C472, C474 and/or C476 tail light assembly.

3 Drive the ON position.

4 Check the voltage between the left rear light unit, circuit 15S-LG14A (green-red), from the wiring side, and "weight".

- 3-/5-door options: pin 2 C472

- 4-door variant: pin 1 C476

- "station wagon": pin 1 C474

• Does the meter show battery voltage?

→ Yes

Go to S6

→ No

REPAIR circuit 15S-LG14A. CHECK the system is working properly.

S8: CHECK 31-LF23 / 31-DA18 GROUND CIRCUIT

1 Enter the OFF position.

2 Measure the resistance between the left tail light assembly, circuit 31-LF23 (black) / 31-DA18 (black), from the wiring side, and "weight".

- 3-/5-door options: pin 3 C472

- 4-door variant: pin 6 C476

- "station wagon": pin 3 C474

• Is the resistance less than 2 ohms?

→ Yes

After checking the bulb, REPLACE the left rear light assembly. CHECK the system is working properly.

→ No

REPAIR the ground circuit 31-LF23 / 31-DA18 CHECK the system is working properly.

T1: CHECK ELECTRICAL CIRCUIT (AND)

1 Disconnect Connector C51.

2 Drive the ON position.

• Are the brake lights on all the time?

→ Yes

REPAIR circuit 15S-LG21 (green-black), 15S-LG14A (green-red), 15S-LG14 (green-red) or 15S-LG6 (green-yellow). CHECK the system is working properly.

→ No

Go to T2

T2: CHECK STOP LIGHT SWITCH

1 Disconnect Connector C444.

2 Drive the ON position.

• Do the brake lights come on?

→ Yes

Vehicles without Electronic Stability Program: Go to T3

Vehicles with Electronic Stability Program: Go to T6

→ No

REPLACE brake light switch. CHECK the system is working properly.

T3: CHECK MODULES

1 Disconnect the C385 ABS control module.

2 Disconnect the C415 powertrain control module.

3 Disconnect the C831 speed control module.

• Are the brake lights on all the time?

→ Yes

REPAIR circuits 15S-CF58, 15S-LG14B, 15S-LG14A, 15S-RN2, 15S-RE13, or 15S-PG17. CHECK the system is working properly.

→ No

Go to T4

T4: CHECK ABS CONTROL MODULE

1 Connect the ABS Control Module.

2 Drive the ON position.

• Are the brake lights on all the time?

→ Yes

REPLACE ABS control module. CHECK the system is working properly.

→ No

Go to T5

T5: INSPECT POWERTRAIN CONTROL MODULE (PCM)

1 Connect Powertrain Control Module (PCM).

2 Drive the ON position.

• Are the brake lights on all the time?

→ Yes

REPLACE the powertrain control module (PCM) CHECK the system is working properly.

→ No

REPLACE speed control module. CHECK the system is working properly.

T6: CHECK ELECTRICAL CIRCUIT 15S-LG14A

1 Detach C1014 BJB.

2 Drive the ON position.

• Are the brake lights on all the time?

→ Yes

REPAIR circuit 15S-LG14A to C51. CHECK the system is working properly.

→ No

Go to T7

T7: CHECK MODULES

1 Disconnect the C830 of the Electronic Stability Program module.

2 Disconnect the C415 powertrain control module.

3 Disconnect the C831 speed control module.

4 Drive the ON position.

• Are the brake lights on all the time?

→ Yes

REPAIR circuit 15S-PG7, 15S-PG17, 15S-RE13, 15S-RN2, 15S-CF58, or 15S-CF58A. CHECK the system is working properly.

→ No

Move to T8

T8: CHECK E-STABILITY PROGRAM MODULE (ESP)

1 Connect the Electronic Stability Program Module (ESP).

2 Drive the ON position.

• Are the brake lights on all the time?

→ Yes

REPLACE Electronic Stability Program module (ESP). CHECK the system is working properly.

→ No

Go to T5