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

-------------------------------------------------

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)
- For further information about the fuses and relays, see the Wiring Diagram
- Checking wiring and terminals Checking Wiring and Terminals









Continue - 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.
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 - VERIFIED

No - VERIFICATION FAILED

------------------------

VERIFIED - FAULT FOUND

VERIFICATION FAILED - Fault-tracing information

-------------------------------------------------

Fault-tracing information

Attempt New Test - Checking the component and wiring

-------------------------------------------------