This might help too
If there is a condition, where the heating or ventilation of the driver of passenger seat cannot be switched on, this will be stored as a malfunction in the Vehicle Electrical System Control Module -J519-, in the Memory Seat/Steering Column Adjustment Control Module - J136- or in Passenger Memory Seat Control Module -J521- (depending on the vehicle type and the vehicle equipment level). Currently no information is sent to the Climatronic Control Module - J255- via the data bus system; the DTC memory must be read out in each control unit or in the Comfort System Central Control Module - J393- using the Vehicle Diagnosis, Testing and Information System VAS 5051 under "Guided Fault Finding". If there is a complaint about seat heating or seat ventilation, first check the control module DTC, which controls the seat heating and seat ventilation.
The seat heating and ventilation is adjusted by the Climatronic control module; the adjustment is transmitted to the vehicle electrical system control module via the data bus. The specified temperatures for the different seat heating and seat ventilation settings are stored in the vehicle electrical system control module. Depending on the version of the vehicle electrical system control module and on the vehicle build date, the specified temperature for the seat heating and ventilation can be different with the same setting on the Climatronic control module. Check using Vehicle Diagnosis, Testing and Information System VAS 5051 under "Guided Fault Finding" (for the vehicle electrical system control module).
Bookmarks