Heating/A/C - Front Heater Blower Runs With Ignition OFF

Front heater blower runs on although ignition is switched off

Topic number L183.30-P-056231

Version 1

Design group 83.30 Air conditioning

Date 04-22-2013

Validity X 166 with code 582 up to YoM 13/1 (vehicles up to code
804 -> as of code 804 already in production)

Reason for change

Complaint:

- The front heater blower runs on after the engine is switched off although the ignition is off.

The fault code 906E87 (The rear blower regulator has a malfunction. Message missing) is stored in the fault memory.

Cause:
- The blower regulator of the rear A/C is confusing the LIN bus.

Remedy:
Update software of air conditioning control unit (software available as of DVD 05/12)

Replacing the blower regulator does not remedy the issue!





Symptoms





Control unit/fault code