Front Wiper Speed Class Matrix: Diagnostics

The diagnostic socket allows the transfer of information between the CJB, the rain/light sensor and T4. The diagnostic socket is located in the lower fascia closing panel, on the driver's side, below the steering column.

The rain/light sensor performs an internal self-test in the first 50ms from the ignition being switched to position I and 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 CJB will control wiper operation as if a rain/light 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 bus. If a fault is detected, a code applicable to that fault is stored in a fault log. Two fault logs are provided within the CJB for internal and external faults.