Signal Too High. Permanent Fault

Signal too high. Permanent fault

Checking cables
Check the signal cable between climate control module (CCM) terminal #A10 and right seat heater module terminal A#2. Check for a short-circuit to supply voltage.

Note! If the seat heater is activated at high or low level, the signal in the cable is pulsed between approximately 0 V and battery voltage.

Check that the power supply to the seat heater module is OK between connectors A#1 (ground) and A#4 (battery voltage).
The ignition must be on during this check.
For further information about the circuit before the seat heater module, refer to the "Wiring diagrams" Service Manual. Try a new seat heater module if the signal cable and power supply is OK.
Remedy as necessary.

Other information:
- To access and replace the seat heater pad, see Heater pad backrest, replacing Heater Pad Backrest, Replacing and Heater pad seat cushion Heater Pad Seat Cushion.
To access and replace the seat heater module, see Seat heater module, replacing Front Seat, Driver's Seat, Front Seat
- To remove the control module, see Comfort module Removal and Replacement
- To connect the breakout box, see Connecting the breakout box, climate control module Connecting The Breakout Box
- The voltage in the signal cable is a pulsed signal. See Climate control signal specifications Signal Specification for the values
- Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault














Continue - Verification
DONE

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Verification

Hint: After carrying out the repair, check that the fault has been remedied.








- Ignition off
- Reinstall the connectors, components etc.
- Ignition on
- Wait at least three minutes so that the control module has time to carry out its diagnostic
- Read off diagnostic trouble codes (DTCs).
The fault has been remedied if the status of the diagnostic trouble code (DTC) has changed to intermittent.





Has the status of the diagnostic trouble code (DTC) changed to intermittent?

Yes - FAULT FOUND

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 cables

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