L.H.D.

Checking LIN bus to Climate control module (CCM)

Checking communication faults
Problems with the Damper motor module (DMM) and Air quality sensor (AQS) can be because one or more of the units transmits messages on the LIN bus continuously. This means that the LIN bus is filled with messages, which, for example, can disrupt calibration of the damper motors.

The Climate control module (CCM) checks the messages in the two different LIN busses. If the Climate control module (CCM) believes that there has been a communication error on the LIB bus, a counter counts for the Damper motor module (DMM) which has sent the message.
Click the VCT2000 symbol to check if any of the Damper motor modules (DMM) have caused a new communication error on the LIN bus.
The registered communication faults read out should be interpreted as follows:
- Less than 10 registered communication errors is considered normal.
- If any of the Damper motor modules (DMM) have more than 10, but less than 100, registered communication errors, the difference with the Damper motor module (DMM) that has the next most registered communication errors must be greater than 10.
- If any of the Damper motor modules (DMM) have more than 100 registered communication errors, the difference with the Damper motor module (DMM) that has the next most registered communication errors must be greater than 100.
If no Damper motor module (DMM) meets the requirements, replace it.

Other information:
- Damper motor module (DMM) temperature, replacing, L.H.D Service and Repair
- Damper motor module (DMM) defroster, replacing, L.H.D Service and Repair
- Damper motor module (DMM) recirculation, replacing, L.H.D Service and Repair
- Damper motor module (DMM) air distribution, replacing, L.H.D Service and Repair





Was a damaged Damper motor module (DMM) found?

Yes - Checking the function

No - No Fault Found

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Checking the function
After carrying out the repair, check that the fault no longer exists.
Perform a check of the climate control system.
- Ignition off.
- Restore components and connectors.
- Ignition switch position II.
- Set the climate control to AUTO and allow it to stabilize.
- Then go through the various settings for the climate control system using the switches on the Climate control module (CCM), see image, and allow the climate control to stabilize in each position.
- Return to AUTO and allow the vehicle to stand for a while.
- Then check that the customer symptoms no longer exist.
Click the VCT2000 symbol to check if any of the Damper motor modules (DMM) have caused a new communication error on the LIN bus. If the status is unchanged, the correct corrective action has been taken.









Do you want to exit fault-tracing?

Yes - Fault Found

No - Checking communication faults

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