Wiper and Washer Systems: Testing and Inspection

Diagnostics







The diagnostic socket allows the transfer of information between the GEM, the rain/light sensor and T4.The diagnostic socket is located in the fascia, in the driver's side stowage tray. The socket is secured in the fascia and protected by a hinged cover.

The rain/light sensor can store fault codes, which can be used to diagnose faults or non-function of the rain/light sensor. The faults are stored in a non-volatile memory, which retains the logged fault codes even when the power supply is disconnected. If a rain/light sensor fault prevents the sensor from operating, the GEM will control wiper operation as if a rain/light sensor is not installed in the system.

The GEM monitors all inputs and outputs relative to the wiper system and other GEM controlled functions. If a fault is detected, a code applicable to that fault is stored in a fault log. Two fault logs are provided within the GEM for internal and external faults. The GEM is capable of detecting open and short circuits and also incorrect K bus messages.