Faulty Signal

Faulty signal

Checking the component




- Ignition on.
Check that the back-up (reversing) lamp is only lit when back-up (reverse) gear is engaged.

Was a fault detected?

Yes - Checking components and wiring

No - Checking components and wiring

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Checking components and wiring
Check the cable between the central electronic module (CEM) and the back-up (reversing) lamp switch. Check for an open-circuit. Check for a short-circuit to ground.
Take readings between:
- Central electronic module (CEM) terminal #C34 (34) and back-up (reversing) lamp switch terminal #1 (3/10).
Measure the resistance between back-up (reversing) lamp switch terminals #1 and #2 with gears 1 to 5 engaged. The resistance must be high.

Hint: The back-up (reverse) gear switch should be open in all gear positions except back-up (reverse).

Remedy as necessary.

Other information
- Connecting the breakout box Connecting the Breakout Box, Central Electronic Module (CEM)
- Signal specification Pinout Values and Diagnostic Parameters
- Back-up lamp switch, replacing Service and Repair
- Checking wiring and terminals Checking Wiring And Terminals










Continue - Verification

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Verification




Verification

Verification

Hint: After carrying out the repair, check that the fault has been remedied.








- Ignition off
- Reinstall the connectors, components etc.
- Ignition on.
The back-up (reversing) lamp should not light with gears 1 to 5 engaged.

Is the function OK?

Yes - VERIFIED

No - VERIFICATION FAILED

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VERIFIED - Fault Found

VERIFICATION FAILED - Fault-tracing information

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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 - FAULT-TRACING FAILED

No - Attempt New Test

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FAULT-TRACING FAILED - FAULT-TRACING FAILED

Attempt New Test - Checking the component

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Checking components and wiring
Check central electronic module (CEM) connector C. Check for contact resistance and oxidation. Check for damage in particular.
Check the connector on the back-up (reversing) lamp switch. Check for contact resistance and oxidation. Check for damage in particular.
Check the cable between the central electronic module (CEM) and the back-up (reversing) lamp switch. Check for an open-circuit. Check for an intermittent short-circuit to ground.
Take readings between:
- Central electronic module (CEM) terminal #C34 (34) and back-up (reversing) lamp switch terminal #1 (3/10).

Other information
- Connecting the breakout box Connecting the Breakout Box, Central Electronic Module (CEM)
- Signal specification Pinout Values and Diagnostic Parameters
- Back-up lamp switch, replacing Service and Repair
- Checking wiring and terminals Checking Wiring And Terminals


Continue - Verification

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