Interior Lighting

Refer to PDU User Guide
The complexity of the electronics involved with the various Electronic Control Modules and the two multiplexed communication networks, preclude the use of workshop general electrical test equipment. Therefore, reference should be made to the PDU User Guide for detailed instructions on testing the interior lamps and circuits.

The PDU systematically tests and analyses the lamp assemblies, the bulbs and the electrical connections to them. It should be noted that the lamps are not wired directly to the switches. Each manual switch provides a signal to the Body Processor which interprets the signal as a request to switch on a specific lamp.

The lamps are controlled directly by the Body Processor (it has a sufficient number of high power output stages to drive the lamps/ relays compared to other modules) except for the door mounted hazard / puddle lamps.

The door hazard / puddle lamps are controlled locally by the relevant Door Module.

The Body Processor Module receives messages on the SCP network from the door modules relating to door ajar / closed / locked status, sensed by the door courtesy switch(es).

Where a fault involving a lamp is indicated by the PDU, some basic diagnostic methods may be necessary to confirm that connections are good and that wiring is not damaged, before replacing the components.