Signal Too High. Permanent Fault

Signal too high. Permanent fault

Checking the signal wire




- Ignition off.
- Disconnect the 20-pin connector (group B) from the central electronic module (CEM).
- Disconnect connector from front left seat heater.
Check signal wire between central electronic module (CEM) 11B and front left seat heater 2 for a short circuit to voltage supply as described in Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Do the necessary corrective action.

Additional information:
- For information on the central electronic module (CEM) connector, see Central electronic module (CEM), replacing Central Electronic Module (CEM), Replacing
- To connect the test box, see Connecting the breakout box Connecting the Breakout Box, Central Electronic Module (CEM)
- For information on signals, see Signal specification Pinout Values and Diagnostic Parameters.













Is the signal wire correct?

Yes - Replacing the component

No - Verification

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Replacing the component
Replace the heating module.


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 the connectors, install the components, etc.
- Ignition on.
Check that diagnostic trouble code status changes from permanent to intermittent.





Is the diagnostic trouble code status intermittent?

Yes - VERIFIED

No - VERIFICATION FAILED

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VERIFIED - Fault Found

VERIFICATION FAILED - Trouble-shooting information

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Trouble-shooting 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 signal wire

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