Components Actuated By A/C System, Electrical Test

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NOTE:

Various electrical components of the vehicle (for example, the Rear Window Defogger -Z1- and heated seats) which are not part of the Air Conditioning (A/C) system are actuated by the Climatronic Control Module -J255- front A/C display control head (or the Rear A/C Display Control Head -E265-). In the case of the rear window defogger -Z1-, an activation request, for example, is first transmitted via the data bus to the Data Bus On Board Diagnostic Interface -J533- and then to the Comfort System Central Control Module -J393-. The Comfort System Central Control Module -J393- then activates the Rear Window Defogger -Z1- via the Rear Window Defogger Relay -J9-, refer to Wiring Diagram. Perform the electrical test for these components as described in Guided Fault Finding for the A/C system and the Comfort System Central Control Module -J393-, refer to Vehicle Diagnostic Tester in the "Guided Fault Finding " function.

Certain A/C system functions can be switched on and off via the Multi Media Interface (MMI) under the "A/C system" function in the "car" / "car systems" menu. The A/C system control can also be influenced via presettings in the MMI under the "A/C system" function in the "car" / "car systems" menu. Therefore, first check the presetting in the MMI in the case of a problem with these components, refer to Infotainment/MMI Operating Instructions.