Faulty Signal

Faulty signal

Replacing the component
The fault has probably occurred as a result of a defective potentiometer or a short-circuit in the potentiometer. If the fault is intermittent, it has been registered previously but is no longer present. Intermittent faults may be caused by interference at start up of the control module. Intermittent faults may also be caused by other types of intermittent faults. The fault is evaluated depending on how it occurs. If the fault recurs, replace the control module.
If the fault persists, replace the climate control module (CCM). The potentiometer cannot be replaced as a separate part.

Other information:
- To access and replace the control module, see Climate control module (CCM), replacing Service and Repair.





Select "Continue" when the fault has been remedied.

Continue - Checking LIN bus

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Checking LIN bus

Identification

Hint: After replacing the climate control module (CCM), the LIN bus must be checked to identify which damper motors are installed and to identify their function and positions.




- Ignition off
- Reinstall the connectors, components etc.
- Ignition on.
Click the VCT2000 symbol to activate the check.






Continue - DONE

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DONE - Verification

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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.
Check the function of the blower fan control. Turn the control between the minimum and maximum positions.

Does the fan speed change?

Yes - VERIFIED

No - VERIFICATION FAILED

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VERIFICATION FAILED - Information

VERIFIED - Fault Found

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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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Attempt New Test - Replacing the component

FAULT-TRACING FAILED - No Fault Found

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