Signal Missing. Permanent Fault

Signal missing. Permanent fault

Checking the component




- Ignition off.
Disconnect left seat heater 9/12.
Check the left seat heater module and connector. Check for oxidation.

Other information:
- Checking wiring and terminals Checking Wiring And Terminals.









Was a fault detected?

Yes - Verification

No - Checking the cable

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Checking the cable




- Ignition off
- Disconnect the connector from the central electronic module (CEM)
- Disconnect connector (9/12) from the front left seat heater.
Check the signal cable between central electronic module (CEM) terminal #11B and front left seat heater (9/12) connector terminal #2. Check for a short-circuit to ground. Check for an open-circuit.
Remedy as necessary.

Other information:
- For information about the central electronic module (CEM) connector, see Central electronic module (CEM), replacing Central Electronic Module (CEM), Replacing
- To connect the breakout box, see Connecting the breakout box Connecting the Breakout Box, Central Electronic Module (CEM)
- For information about signals, see Signal specification Pinout Values and Diagnostic Parameters
- Checking wiring and terminals Checking Wiring And Terminals.













Is the cable OK?

Yes - Verification

No - Replacing the component

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Replacing the component
Replace the seat heater control module. See Power seat module (PSM), replacing Service and Repair.


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.
Set the seat heating to maximum.

Was 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 - No Fault Found

Attempt New Test - Checking the component

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