Fault diagnosis

N21 HORNS WORKING OUT OF TUNE"

Engines: 2.0 16V, 2.0 JTD 8V, 2.3 JTD 16V, 2.8 JTD 8V

STEP	OPERATIONS TO BE CARRIED OUT	TEST RESULTS
1	ELECTRICAL SYSTEM CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the horn circuit fuse seat is not oxidised or with loose contacts See E3010 HORNS	Move on to Step	Fuse seat oxidised or with loose contacts	Restore to correct working order and replace the engine bay control unit if necessary Op. 5505A13 SUPPLEMENTARY JUNCTION CONTROL UNIT IN ENGINE BAY - R R
2	ELECTRICAL SYSTEM CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the horn circuit control relay seat is not oxidised or with loose contacts See E3010 HORNS	Move on to Step	Relay seat oxidised or with loose contacts	Restore to correct working order and replace the engine bay control unit if necessary Op. 5505A13 SUPPLEMENTARY JUNCTION CONTROL UNIT IN ENGINE BAY - R R
3	ELECTRICAL SYSTEM CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the efficiency of horn control relay contacts See E3010 HORNS	Move on to Step	Contacts inefficient	Replace the relay
4	ELECTRICAL SYSTEM CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the efficiency of the horn earth connection See E3010 HORNS	Move on to Step	Earth inefficient	Restore earth connection See E3010 HORNS
5	ELECTRICAL SYSTEM CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the efficiency of the horn positive supply lead terminal See E3010 HORNS	Move on to Step	Terminals inefficient	Replace terminal
6	CHECK ON CORRECT OPERATION	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the horn is working properly		Horn not working properly	Change the horn