Signal Missing

Signal missing

Checking the function of the climate control module (CCM)
- Ignition on.
Check the power supply to the control module by switching on the climate control module (CCM).
The blower fan must blow and it must be possible to regulate the fan speed.

Does the blower fan start?

Yes - Checking communication with the climate control module (CCM)

No - Checking the power supply and ground for the climate control module (CCM)

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Checking the power supply and ground for the climate control module (CCM)
Check that the fuse for the control module is intact.
Check the power supply and ground terminal for the climate control module (CCM) as follows.
Remedy as necessary.

Other information:
- Climate control module (CCM): Checking the supply voltage/ground terminal Checking Supply Voltage/Ground Terminal
- For information about fuse and terminal numbers, see the relevant Wiring Diagram.
- Checking wiring and terminals Checking Wiring And Terminals

Was a fault detected?

Yes - Checking the function of the climate control module (CCM)

No - Checking communication with the climate control module (CCM)

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Checking communication with the climate control module (CCM)

Hint: The CAN communication with the control module is probably OK if the control module ID can be read off. The fault is probably intermittent and may therefore be difficult to locate.




- Try to communicate with the climate control module (CCM) by reading off the control module ID
- Click on the symbol for VCT2000 to begin reading off

Continue - Fault Found

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No Fault Found - No Fault Found

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Checking the function of the climate control module (CCM)

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








- Ignition off
- Reconnect the connectors. Reinstall the components
- Ignition on.
Check the power supply to the control module by switching on the climate control module (CCM).
The blower fan must blow and it must be possible to regulate the fan speed.

Does the blower fan start?

Yes - FAULT FOUND

No - Fault-tracing information

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Fault-tracing information

Attempt New Test - Checking the function of the climate control module (CCM)

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