A/C System Heating Output And Temperature Control Door Activation, Checking: Notes

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The test requirements are met. Refer to TESTING REQUIREMENTS FOR HEATING OUTPUT AND ACTIVATION OF A/C SYSTEM TEMPERATURE CONTROL DOORS .

Checking:

Close the doors, the engine hood, the windows, the sliding sunroof and the rear lid.
Switch on the ignition and initiate ready mode.
Start the engine, the engine may start automatically if necessary (for vehicles with Start/Stop System).

Set the following on the Front A/C Display Control Head -E87- or Front Information Display Control Head 2 -J1060- :

On the Front A/C Display Control Head -E87- or Front Information Display Control Head 2 -J1060- set the SYNC function button:
Select "Auto" mode for the driver side (and the front passenger side) (the indicator lamp in the AUTO button(s) illuminate).
Adjust the temperature preset for all zones (front and rear) "warm" ("HIGH" display).
Preset for fresh air blower (front and rear) "maximum speed".
Set the airflow direction on the driver and front passenger side, at the "footwell" and "instrument panel vents" (view in display).
Adjust the airflow direction at the Rear A/C Display Control Head - E265- for the left and right side, at the "footwell" and "vents in the B-pillar".

-- Initiate Guided Fault Finding for the front A/C system and select the "Read measured values" function. Use the Vehicle Diagnostic Tester.

-- Compare the measured values for the Left Front Upper Body Vent Temperature Sensor -G385-, the Right Front Upper Body Vent Temperature Sensor - G386-, the Left Footwell Vent Temperature Sensor - G261-, the Right Footwell Vent Temperature Sensor -G262- and any of the following measured values depending on vehicle equipment.

PR number. KH5: Rear Upper Body Vent Temperature Sensor -G537-
PR number. 9AH: for the Left Rear Upper Body Vent Temperature Sensor -G635-, Right Rear Upper Body Vent Temperature Sensor -G636-, Left Rear Footwell Vent Temperature Sensor -G637- and the Right Rear Footwell Vent Temperature Sensor -G638-.

The required values are achieved at all temperature sensors:

-- Heating output is OK. Check the DTC memory of the Front A/C Display Control Head -E87- or Front Information Display Control Head 2 -J1060- again.

The required values of the temperature sensor deviate:

The specified values are not reached on any temperature sensor. Refer to Check the heating output of the A/C system .
The specified values are not reached at only one or two temperature sensors. Refer to Check the activation and function of the various .