Fresh Air Blower -V2- With Fresh Air Blower Control Module -J126-, Notes
Currently an Auxiliary Heater Heating Element -Z35- is also installed on vehicles with a high voltage system (hybrid vehicles) and a gasoline engine, refer to ELECTRICAL AUXILIARY HEATER ACTIVATION, CHECKING .
For vehicles with a gasoline engine, the electric auxiliary heater (the Auxiliary Heater Heating Element -Z35-) is activated by the Climatronic Control Module -J255- control head via the local data bus (activated via the same outlet and also via the Fresh Air Blower Control Module -J126-) on the Auxiliary Air Heater Control Module -J604-. If there is a complaint with these vehicles, check the Fresh Air Blower Control Module -J126- or Fresh Air Blower -V2- and the Auxiliary Air Heater Control Module -J604-. Use the Vehicle Diagnostic Tester in the "Guided Fault Finding" function and appropriate System Wiring Diagram.
Make sure to use the correct version of the Fresh Air Blower Control Module -J126-. For vehicles with a high voltage system (hybrid vehicles) and gasoline engines, additional information is sent to activate the Auxiliary Air Heater Control Module -J604-, for example via the local Data bus.