Horn: Testing and Inspection

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 horn circuit.

The PDU systematically tests and analyses all functions of the horn, the horn relay, the body processor module and the operating switch.

Where a fault involving the horn, relay or switch 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 component.