Manual Fault Diagnosis

The climate control unit runs through a diagnosis program and then displays the number of faults discovered, with a code for each.

The following types of fault are indicated:
^ Break in circuit continuity
^ Short-circuit
^ Component failure
^ Motor seizure
^ Reversed polarity (electric motor)


However, the program will not indicate if the fault is in a component or in the wiring, e.g. if the type of fault is a break in circuit continuity or a short-circuit.


Example: The error code (2U) indicates a break in continuity in the ambient air temperature sensor circuit. This means that the connectors, wiring and sensor must be checked to ascertain whether power is reaching the sensor. If power is present, fit a new sensor. If the fault still persists, fit a new climate control unit.



CAUTION: Before starting any work on the system, always disconnect the 25-pin connector for the climate control unit. The control unit can be damaged by above-normal voltages.