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2.6 Air Conditioning (A/C) (Tempmatic)    >   12 Diagnosis - Reading Actual Values - via Hand-Held tester (HHT)

Test step/Test sequence Test condition Nominal value Possible cause/Remedy 1) Circuit 30   Wiring, Battery. Engine temperature Ignition: ON Start engine and bring to operating temperature. Operating temperature approx. ° Wiring, ECT sensor (B11/4), All Activity Module (AAM) (N10). Outside air temperature Ignition: ON Based on yearly season, approx. ° Wiring, Outside temperature indicator temperature sensor (B14), All Activity Module (AAM) (N10). Blower relay (F1k21) Voltage supply Ignition: ON Blower set to stage 4 Wiring, F1k21, Blower motor (M2), All Activity Module (AAM) (N10). Engine cooling fan stage 1 relay (F1k26) Ignition: ON Wiring, F1k26, Auxiliary fan (M4), All Activity Module (AAM) (N10). Circulation pump relay (F1k19) Ignition: ON Wiring, F1k19, Coolant circulation pump (M13), All Activity Module (AAM) (N10). Refrigerant pressure Start engine. button is illuminated. Blower motor set to stage 4 23 9.0 A/C compressor (A9) Start engine. button is illuminated. Blower motor set to stage 4 23 8.0 , All Activity Module (AAM) (N10), A9 Activate A/C system Ignition: ON Wiring, A/C pushbutton control module (N19), All Activity Module (AAM) (N10)