Checking the Rear Fog Lamp
Checking the rear fog lamp
Checking the signal from the switch for the rear fog lamp
- Ignition on.
Turn the lighting switch to position 2 and activate the switch for the rear fog lamps. Read off the signal from the switch for the rear fog lamps. The value must be On.
Is the value On?
Yes - Checking the wiring and component
No - Checking the wiring and component
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Checking the wiring and component
- Ignition off.
Check that fuse 23 the integrated relay / fusebox in the engine compartment is intact.
Check the cable between fuse 23 and control module connector F terminal #11 (#B11). Check the cable between control module connector P terminal #6 (#B26) and lighting switch terminal #10. Check for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault. Check for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault. Check for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check the cable between control module connector P terminal #5 (#B25) and left and right parking lamp terminal #1. Check for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Try a new switch if no fault is found in the cables.
Remedy as necessary.
Other information
- To connect the breakout box, see Connecting the breakout box Connecting The Breakout Box. Central Electronic Module (CEM)
- For information about signals, see Signal specification Signal Description. Central Electronic Module (CEM)
- To access or replace the switch, see Replacing rocker switch Replacing Rocker Switch
- To access or replace the relay or fuse, see the inside of the cover on the engine compartment relay/fusebox.
Continue - Verification
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Checking the wiring and component
- Ignition off.
Check that the bulbs for the rear fog lamp are intact.
Check the cable between fog lamp switch terminal # 13 and control module connector P terminal #4 (#B24). Check the cables between control module connector B1 terminal #11 (#A41) and left and right fog lamps terminal #2.1. Check for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault. Check for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault. Check for short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check the ground leads from each fog lamp. Check for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault. Check for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Remedy as necessary.
Other information
- To connect the breakout box, see Connecting the breakout box Connecting The Breakout Box. Central Electronic Module (CEM)
- For information about signals see Signal specification Signal Description. Central Electronic Module (CEM).
Continue - Verification
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Verification
Verification
Hint: After carrying out the repair, check that the fault has been remedied.
- Ignition off.
- Reinstall the connectors, components etc.
- Ignition on.
Activate the rear fog lamp. The rear fog lamp must both light and go out.
Does the rear fog lamp light and go out?
Yes - VERIFIED
No - VERIFICATION FAILED
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VERIFICATION FAILED - Fault-tracing information
VERIFIED - FAULT FOUND
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Fault-tracing information
Information
Fault-tracing information
The fault should have been detected and remedied. As this is not the case fault-tracing has failed.
Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.
Do you want to exit fault-tracing?
Yes - Exit fault-tracing
No - Attempt New Test
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Attempt New Test - Checking the signal from the switch for the rear fog lamp
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