Principles Of Operation: Diagnostics

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The diagnostic socket allows the transfer of information between the CJB and diagnostic equipment. The diagnostic socket is located in the lower instrument panel, on the driver's side, below the steering column.

The rain sensor performs an internal self-test when the ignition is switched on and can store fault codes, which can be used to diagnose faults or non-function of the rain 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 sensor fault prevents the sensor from operating, the CJB will control wiper operation as if a rain sensor is not installed in the system.

The CJB monitors all inputs and outputs relative to the wiper system and other CJB controlled functions on the LIN (local interconnect network) bus. If a fault is detected, a code applicable to that fault is stored.