Signal Missing. Permanent Fault

Signal missing. Permanent fault

Checking the connectors




- Ignition off.
Check connector 54/3 and the connector for the central electronic module (CEM). Check for contact resistance and oxidation. Remedy if necessary.
Check for any damage.

Hint: If the fault cause is found, reinstall the components, connectors etc. If the fault cause is not found, do not reinstall the central electronic module (CEM) before continuing with fault-tracing.

Other information:
- To access the central electronic module (CEM) connector, see Central electronic module (CEM), replacing Central Electronic Module (CEM), Replacing
- For connector 54/3, see applicable wiring diagram
- Checking wiring and terminals Checking Wiring And Terminals.









Was a fault detected?

Yes - Verification

No - Checking the component and cable

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Checking the component and cable




- Ignition off.
Check the cable between central electronic module (CEM) connector terminal #20A and the ignition switch 50-supply connector terminal #7. Check for an open-circuit. Check for a short-circuit to ground.

Other information:
- The voltage must be the same as battery voltage if the key is in position III
- To access or replace the central electronic module (CEM) connector, see Central electronic module (CEM), replacing Central Electronic Module (CEM), Replacing
- For the intermediate connector, see the relevant wiring diagram
- To connect the breakout box to the control module, see Connecting the breakout box Connecting the Breakout Box, Central Electronic Module (CEM)
- For further information about signals and other values, see Signal specification Pinout Values and Diagnostic Parameters
- Checking wiring and terminals Checking Wiring And Terminals.













Is the voltage the same as battery voltage?

Yes - Verification

No - Replacing the component

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Replacing the component
Try replacing the ignition switch connector according to Steering wheel lock, replacing Service and Repair.


Continue - Verification

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Verification




Verification

Verification

Hint: After the repair it is necessary to check that the fault has been rectified.








- Ignition off.
- Connect connectors, install components, etc.
- Ignition in starting position.
Check that 50 voltage is OK.





Is voltage on the wire high?

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 - No Fault Found

Attempt New Test - Checking the connectors

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