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LEMON is the spiritual successor to CHARM, I recommend you try it!
Link:
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Control Module HVAC: Service and Repair
ImportantWhen the ACC unit is replaced, the new unit must be programmed, see Electronic Climate Control, Testing and Inspection,"Fault Diagnosis, General."
Testing and Inspection ACC unitTo Remove 1
Remove the radio unit and unplug the connector and aerial if necessary.
2
Remove the ACC unit and unplug the connector.
To fitFit in reverse order.