Faulty Signal

Faulty signal

Checking the status




- Ignition on.
Click the VCT2000 symbol to activate the back-up gear inhibitor.
Check if the fault is permanent or intermittent.
It is not possible to engage back-up gear when the back-up gear inhibitor is activated.
The fault is permanent if the back-up gear inhibitor does not activate.
If the back-up gear inhibitor 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.





Does the value change?

Yes - Verification

No - Checking the component and wiring

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Checking the component and wiring
Check the voltage on the gear selector module (GSM) connector terminal #1-C13 to the output on the central electronic module (CEM). The voltage must be approximately 12 V when the back-up gear inhibitor is activated.
Check the control signal cable. Check for an open-circuit. Check for a short-circuit to supply voltage.
Take readings between:
- Central electronic module (CEM) terminal #A39 (#39) and gear selector module (GSM) connector terminal #1-C13.
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)
- Control module relay box passenger compartment Service and Repair
- Combined instrument panel Combined Instrument Panel
- 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 back-up gear inhibitor.
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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