Faulty Signal

Faulty signal

Checking the blower fan control
Check that the blower fan control is functioning by changing the speed of the blower fan.

Does the fan speed change?

Yes - Fault-tracing information

No - Replacing the component

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Replacing the component
The fault has probably occurred as a result of a defective potentiometer or a short-circuit in the potentiometer. This type of fault means that the climate control module (CCM) must be replaced. The potentiometer cannot be replaced independently.

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



Continue - Verification

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Fault-tracing information
The fault has probably occurred as a result of a defective potentiometer or an intermittent short-circuit in the potentiometer. If the fault is intermittent, it has been registered previously but is no longer present. Intermittent faults can be caused by interference at start up of the control module or may be a different type of fault which occurs on different occasions. The fault is evaluated depending on how it occurs. If the fault recurs, replace the control module.


Continue - Information

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Verification

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




- Ignition off.
- Connect connectors, install components, etc.
- Ignition on.
Check blower switch signal by turning blower switch between minimum and maximum settings.
The value should vary between 0.05 and 4.95 V.





Is the value OK?

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 - Checking the blower fan control

FAULT-TRACING FAILED - No Fault Found

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Information

Fault-tracing information
If the fault is intermittent, do not verify fault-tracing if the fault does not recur.
It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).

Do you want to view the information again?

Yes - Attempt New Test

No - Fault Found

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FAULT FOUND - Fault Found

Attempt New Test - Checking the blower fan control

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