Fault-Tracing Information

Fault-tracing

Checking the component
Check the power supply and ground to the Climate control module (CCM) by switching on the ignition and blower fan. The blower fan must blow and it must be possible to regulate the fan speed.





Was a fault detected?

Yes - Checking the voltage and ground terminal

No - Checking CAN cables

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Verification




Verification

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








- Ignition off
- Reinstall the connectors, components etc.
- Switch on the ignition for at least 10 seconds.
Try communicating with the control module by selecting one of the functions for vehicle communication under the Diagnostic tab.

Is communication established?

Yes - VERIFIED

No - VERIFICATION FAILED

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VERIFIED - FAULT FOUND

VERIFICATION FAILED - Fault-tracing information

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Fault-tracing information

Attempt New Test - Checking the component

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Checking CAN cables

No Fault Found - Fault-tracing information

DONE - DONE

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Checking the voltage and ground terminal
Check that the fuse for the climate control system in the central electronic module (CEM) is intact.
Check the power supply cable from the Central electronic module (CEM) #C3:73 to the Climate control module (CCM) terminal #C1:1. Check for an open-circuit. Check for loose connections. Check for contact resistance. Check for oxidation.
Check the ground cable between Climate control module (CCM) terminal and the ground terminal. Check for an open-circuit, loose connections, contact resistance and oxidation.





Was a fault detected?

Yes - Verification

No - Checking CAN cables

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