A/C Components Controlled Or Activated By Other Control Modules, Electrical Tests

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NOTE:

Various A/C system components are no longer activated directly by the Climatronic Control Module -J255- A/C display and control head. The A/C Compressor Regulator Valve -N280-, for example, is controlled by the Vehicle Electrical System Control Module -J519-. The data is exchanged via the Data Bus between both control modules, using the Vehicle Diagnostic Tester in the "Guided Fault Finding" function.

The measured values of the different A/C system components are no longer directly evaluated by the Climatronic Control Module -J255- A/C display and control head. For example, the pressure signal from the A/C Pressure/Temperature Sensor -G395- is evaluated by the Vehicle Electrical System Control Module -J519- and the measured values are transmitted via the Data Bus to the Climatronic Control Module -J255- A/C display and control head, using the Vehicle Diagnostic Tester in the "Guided Fault Finding" function and the appropriate SYSTEM WIRING DIAGRAM.

From MY 2010, this vehicle has a Start/Stop System for specific engines as optional equipment. The setting on the Climatronic Control Module -J255- A/C display and control head can prevent the stop function. If, for example, "defrost" is selected, the stop function is not possible or will be interrupted and the engine will start. The same applies in the case of heating and cooling. The difference between the selected and actual temperature exceeds a certain value, using the Vehicle Diagnostic Tester in the "Guided Fault Finding" function.