Faulty Signal

Faulty signal

Checking the status




- Ignition on.
Activate the rear windshield defroster.
Check if the fault is permanent or intermittent.
The rear windshield defroster relay clicks when it is activated.
The fault is permanent if the rear windshield defroster does not activate.
If the rear windshield defroster is activated, this is an indication that the fault was present previously but that it is not active at the moment, i.e. the fault is intermittent.





Continue - Checking the component and wiring

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Checking the component and wiring




- Ignition off.
Check that relay 2/82 is correctly installed.
Also check the relay terminal, in particular 2/82 terminal #2. Check for an open-circuit. Check for a short-circuit to ground.
It is not possible to deactivate the tailgate wiper if there is a short-circuit to ground in terminal 2/82#2.

Hint: The fault may have been caused by an open-circuit in the supply to the relay. The voltage must be 12 V at both terminals #1 and #3 for the relay. Also check the fuse for the rear windshield defroster.

Remedy as necessary.

Other information
- Connecting the breakout box Connecting the Breakout Box, Central Electronic Module (CEM)
- Signal specification Signal Description, Central Electronic Module (CEM)
- For further information about the fuses and relays, see the Wiring Diagram
- To replace the relay, see: Control module relay box passenger compartment Service and Repair
- Checking wiring and terminals Checking Wiring and Terminals









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.
Click the VCT2000 symbol to activate and deactivate the relay.
A click should be heard from the relay.
Check that the function is OK.





Is the function OK?

Yes - Troubleshooting procedure complete

No - 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 - Exit Fault-Tracing

No - Attempt New Test

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Attempt New Test - Checking the component and wiring

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