Fog lights (vehicles up to 08.2001) — Pinpoint tests

AK1: CHECK POWER SIGNALS

1 Drive the ON position.

2 Turn on the front and rear fog lights/lights.

3 Check the enable signal.

• Do both switch-on signals light up?

→ Yes

Go to AK2

→ No

Both enable signals do not work: Go to AK3

Front fog light signal not working: REPLACE light switch. CHECK the system is working properly.

AK2: INSPECT ELECTRICAL CIRCUIT 15S-LD1 / 15S-LD11.

1 Enter the OFF position.

2 Disconnect C302 left front fog lamp.

3 Drive the ON position.

4Turn on the front fog lights.

5 Measure the voltage between pin 2 of connector C302 of the light switch, circuit 15S-LD11, wiring side, and "weight".

• Does the meter show battery voltage?

→ Yes

The system is OK after checking the lamp.

→ No

Check and if necessary REPAIR the 15S-LD1/15S-LD11 circuit using the wiring diagrams. If the circuit is OK, REPLACE the light switch. CHECK the system is working properly.

AK3: CHECK F44 FUSE

1 Enter the OFF position.

2 Disconnect Fuse F44 (CJB).

3 Check fuse F44 (CJB)

• Is fuse F44 OK?

→ Yes

Go to AK4

→ No

REPLACE fuse F44. If fuse F44 fails again, FIND and REPAIR the short circuit using the wiring diagrams. CHECK the system is working properly.

AK4: CHECK CJB

1 Enter the OFF position.

2 Disconnect C17 CJB.

3 Connect Fuse F44 (CJB).

4 Verify that fuse F44 is installed and measure the resistance between socket F44 and C17 CJB pin 3, element side.

• Is the resistance less than 2 ohms?

→ Yes

Go to AK5

→ No

REPLACE CJB. CHECK the system is working properly.

AK5: INSPECT CIRCUIT 15-LD16.

1 Disconnect C17 CJB.

2 Disconnect the C320 light switch.

3Measure the resistance between pin 3 of connector C17 of the central electrical box (CJB), circuit 15-LD16, on the wiring side, and pin 7 of the light switch connector C320, on the wiring side.

• Is the resistance less than 2 ohms?

→ Yes

REPLACE light switch. CHECK the system is working properly.

→ No

REPAIR circuit 15S-LD16. CHECK the system is working properly.

AL1: INSPECT REAR FOG LAMP SIGNAL

1 Drive the ON position.

2 Turns on the rear fog light (And)

3 Check the operation of the enable signal.

• Does the rear fog light indicator come on?

→ Yes

Go to AL2

→ No

Vehicles with front fog lamps: Go to AK1

Vehicles without front fog lamps: Go to AL3

AL2: CHECK ELECTRICAL CIRCUIT 15S-LD6

1 Drive the ON position.

2 Disconnect C474/C475 left rear light unit.

3 Turn on the rear fog light (And).

4 Measure the voltage between pin 4 of connector C474/C475, wiring side, and "weight".

• Does the meter show battery voltage?

→ Yes

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

→ No

Check and if necessary REPAIR the 15S-LD6 circuit using the wiring diagrams. If circuit 15S-LD6 is OK, REPLACE light switch. CHECK the system is working properly.

AL3: CHECK FUSE F44

1 Enter the OFF position.

2CHECK F44 (20 A) (CJB).

3 Check fuse F44 (CJB).

• Is the fuse good?

→ Yes

Go to AL4

→ No

REPLACE fuse F44. If F44 fails again, FIND and REPAIR the short circuit using the wiring diagrams. CHECK the system is working properly.

AL4: CHECK CJB

1 Disconnect C17 CJB.

2 Connect Fuse F44 (CJB).

3 Verify that fuse F44 is installed and measure the resistance between socket F44 and C17 CJB pin 3, element side.

• Is the resistance less than 2 ohms?

→ Yes

Go to AL5

→ No

REPLACE CJB. CHECK the system is working properly.

AL5: INSPECT CIRCUIT 15-LD16

1 Enter the OFF position.

2 Disconnect C17 CJB.

3 Disconnect the C320 light switch.

4 Measure the resistance between pin 7 of light switch connector C320, wiring side, and connector C17 CJB, circuit 15-LD16, wiring side.

• Is the resistance less than 2 ohms?

→ Yes

Go to AL2

→ No

REPAIR circuit 15-LD16. CHECK the system is working properly.

AM1: CHECK EQUIPMENT LEVEL

1 Check equipment level.

• Is the vehicle equipped with front fog lamps?

→ Yes

Go to AK1

→ No

Go to AL1

AN1: IDENTIFY FAULTY FOGLIGHT/LAMP

1 Identify the faulty fog/lamp.

• Is one of the front fog lights not working?

→ Yes

Go to AN2

→ No

Rear fog light not working ("station wagon" left hand drive): Go to AN7

Rear fog light not working ("station wagon" right hand drive): Go to AN8

Rear fog light not working (4-door variant): Go to AN9

Rear fog light not working (3-/5-door variant): Go to AN12

AN2: IDENTIFY FAULTY FRONT FOG LAMP

1 Identify the faulty front fog light.

• Left front fog light not working?

→ Yes

Go to AN3

→ No

Go to AN5

AN3: CHECK ELECTRICAL CIRCUIT 15S-LD11

1 Enter the OFF position.

2 Disconnect C302 left front fog lamp.

3 Drive the ON position.

4Turn on the front fog lights.

5 Check voltage between pin 2 of connector C302 left front fog light, circuit 15S-LD11 (green-white), from the wiring side, and "weight".

• Does the meter show battery voltage?

→ Yes

Go to AN4

→ No

REPAIR circuit 15S-LD11. CHECK the system is working properly.

AN4: CHECK 31-LD11 GROUND CIRCUIT

1 Enter the OFF position.

2 Measure the resistance between C302 pin 1 of left front fog lamp circuit 31-LD11, wiring side, and "weight".

• Is the resistance less than 5 ohms?

→ Yes

After checking the bulb, REPLACE the left front fog lamp. CHECK the system is working properly.

→ No

REPAIR circuit 31-LD11. CHECK the system is working properly.

AN5: INSPECT ELECTRICAL CIRCUIT 15S-LD17

1 Enter the OFF position.

2 Disconnect C304 right front fog lamp.

3 Drive the ON position.

4Turn on the front fog lights.

5 Check the voltage between pin 2 of right front fog lamp connector C304, circuit 15S-LD17 (green-white), from the wiring side, and "weight".

• Does the meter show battery voltage?

→ Yes

Go to AN6

→ No

REPAIR circuit 15S-LD17. CHECK the system is working properly.

AN6: CHECK 31-LD17 GROUND CIRCUIT

1 Enter the OFF position.

2 Measure the resistance between pin 1 of right front fog lamp connector C304, circuit 31-LD17, wiring side, and "weight".

• Is the resistance less than 2 ohms?

→ Yes

After checking the bulb, REPLACE the right front fog lamp. CHECK the system is working properly.

→ No

REPAIR circuit 31-LD17. CHECK the system is working properly.

AN7: INSPECT ELECTRICAL CIRCUIT 15S-LD6

1 Enter the OFF position.

2 Disconnect C474 left rear light assembly.

3 Drive the ON position.

4 Turn on the rear fog light.

5 Measure the voltage between pin 4 of connector C474 of the left rear light unit, circuit 15S-LD6, wiring side, and "weight".

• Does the meter show battery voltage?

→ Yes

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

→ No

REPAIR circuit 15S-LD6. CHECK the system is working properly.

AN8: CHECK ELECTRICAL CIRCUIT 15S-LD6

1 Enter the OFF position.

2 Disconnect C475 right rear light unit.

3 Drive the ON position.

4 Turn on the rear fog light.

5 Measure the voltage between pin 4 of connector C475 of the right rear light unit, circuit 15S-LD6, wiring side, and "weight".

• Does the meter show battery voltage?

→ Yes

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

→ No

REPAIR circuit 15S-LD6. CHECK the system is working properly.

AN9: IDENTIFY FAULTY REAR FOG LAMP

1 Identify the faulty rear fog light.

• Left rear fog light not working?

→ Yes

Go to AN10

→ No

Go to AN11

AN10: INSPECT ELECTRICAL CIRCUIT 15S-LD6A

1 Enter the OFF position.

2 Disconnect C476 left rear light assembly.

3 Drive the ON position.

4 Turn on the rear fog light.

5 Measure the voltage between pin 5 of connector C476 of the left rear light unit, circuit 15S-LD6A, wiring side, and "weight".

• Does the meter show battery voltage?

→ Yes

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

→ No

REPAIR circuit 15S-LD6A. CHECK the system is working properly.

AN11: CHECK ELECTRICAL CIRCUIT 15S-LD12

1 Enter the OFF position.

2 Disconnect the C477 of the right rear light assembly.

3 Drive the ON position.

4 Turn on the rear fog light.

5 Measure the voltage between pin 5 of connector C477 of the right rear light unit, circuit 15S-LD12, wiring side, and "weight".

• Does the meter show battery voltage?

→ Yes

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

→ No

REPAIR circuit 15S-LD12. CHECK the system is working properly.

AN12: CHECK ELECTRICAL CIRCUIT 15S-LD6

1 Enter the OFF position.

2 Disconnect the C434 rear fog light.

3 Drive the ON position.

4 Turn on the rear fog light.

5 Measure the voltage between C434 rear fog light connector pin 2, circuit 15S-LD6, wiring side, and "weight".

• Does the meter show battery voltage?

→ Yes

Go to AN13

→ No

REPAIR circuit 15S-LD6. CHECK the system is working properly.

AN13: CHECK 31-LD6 GROUND CIRCUIT

1 Enter the OFF position.

2 Measure the resistance between C434 rear fog light connector pin 1, circuit 31-LD6, wiring side, and "weight".

• Is the resistance less than 2 ohms?

→ Yes

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

→ No

REPAIR circuit 31-LD6. CHECK the system is working properly.

AO1: CHECK LIGHT SWITCH

1 Enter the OFF position.

2 Disconnect the C320 light switch.

3 Drive the ON position.

4 Check if the front fog lights come on all the time.

• Do the front fog lights come on all the time?

→ Yes

REPAIR circuit 15S-LD1, 15S-LD11, or 15S-LD17. CHECK the system is working properly.

→ No

Replace light switch. CHECK the system is working properly.

AP1: CHECK LIGHT SWITCH

1 Enter the OFF position.

2 Disconnect the C320 light switch.

3 Drive the ON position.

4 Check if the rear fog light comes on all the time (And).

• Rear fog lamp (And) turn on all the time?

→ Yes

REPAIR circuit 15S-LD6 and/or 15S-LD6, 15S-LD6A, or 15S-LD12. CHECK the system is working properly.

→ No

REPLACE light switch. CHECK the system is working properly.