72511 - I17 REVERSING LIGHTS NOT WORKING

When reverse gear is engaged the reversing warning lights do not work;

The reversing lights are controlled directly by the switch on the gearbox.The Body Computer Node receives a lights on signal from the positive supply for the reversing light bulbs.

STEP	OPERATIONS TO BE CARRIED OUT	TEST RESULTS
1	CHECK USING DIAGNOSTIC EQUIPMENT.	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Connect the Examiner diagnostic equipment to the diagnostic socket and check the following at the Body Computer Node: the plausibility of the reversing lights On/Off parameter	Move on to Step	The parameter does not change status	Move on to Step
2	DASHBOARD JUNCTION UNIT CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
2.4 20 V,2.0 TB,2.4 JTD 10V	Check: for the presence of an input positive from the switch on the gearbox with reverse gear engaged the continuity inside the dashboard junction unit to the input from the switch on the gearbox and to the output towards the bulbs (Wiring Diagram ) E2022 REVERSING LIGHTS	Move on to Step	1. No positive at the input	Move on to Step
			2. Dashboard control unit interrupted internally	2. Replace the dashboard junction unit    See in Op. 5505A10 Junction UNIT - R.R.
2	DASHBOARD JUNCTION UNIT CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check: for the presence of an input positive from the switch on the gearbox with reverse gear engaged the continuity inside the dashboard junction unit to the input from the switch on the gearbox (Wiring Diagram ) E2022 REVERSING LIGHTS	Move on to Step	1. No positive at the input	Move on to Step
			2. Dashboard control unit interrupted internally	2. Replace the dashboard junction unit    See in Op. 5505A10 Junction UNIT - R.R.
3	ENGINE COMPARTMENT JUNCTION UNIT CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
2.4 20 V,2.0 TB,2.4 JTD 10V	Check: the presence of an output positive towards the switch on the gearbox the continuity inside the engine compartment junction unit. (Wiring Diagram ) E2022 REVERSING LIGHTS	Move on to Step	1. No positive at the output.	Move on to Step
			2. Engine compartment junction unit interrupted inside	2. Replace engine compartment junction unit    See in Op. 5505A13 Additional junction unit in engine compartment - R.R.
4	ELECTRICAL SYSTEM CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
2.4 20 V,2.0 TB,2.4 JTD 10V	Check the continuity between: engine compartment junction unit and switch on gearbox. dashboard junction unit and switch on gearbox. (Wiring Diagram ) E2022 REVERSING LIGHTS	Move on to Step	wiring broken	Restore the electrical connection (Wiring Diagram ) E2022 REVERSING LIGHTS
4	ELECTRICAL SYSTEM CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
3.0 V6	Check the continuity between: dashboard junction unit and switch on gearbox. (Wiring Diagram ) E2022 REVERSING LIGHTS	Move on to Step	wiring broken	Restore the electrical connection (Wiring Diagram ) E2022 REVERSING LIGHTS
5	SWITCH ON GEARBOX CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
2.4 20 V,2.0 TB,2.4 JTD 10V	Check the operation of the switch on the gearbox (Wiring Diagram ) E2022 REVERSING LIGHTS	Move on to Step	Switch on gearbox faulty.	Replace the switch    See in Op. 5550D22 reversing light switch - r+r
5	MULTIFUNCTION SWITCH ON GEARBOX CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
3.0 V6	Check the operation of the switch on the gearbox (Wiring Diagram ) E2022 REVERSING LIGHTS	Move on to Step	Switch on gearbox faulty.	Replace the switch    See in Op. 5550D22 reversing light switch - r+r
6	ELECTRICAL SYSTEM CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the continuity between the engine compartment junction unit and the dashboard junction unit. (Wiring Diagram ) E2022 REVERSING LIGHTS	Move on to Step	wiring broken	Restore the electrical connection (Wiring Diagram ) E2022 REVERSING LIGHTS
7	DASHBOARD JUNCTION UNIT CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the internal continuity of the dashboard junction unit from the input connector to the fuse (Wiring Diagram ) E2022 REVERSING LIGHTS	Move on to Step	dashboard control unit interrupted internally	Replace the dashboard junction unit    See in Op. 5505A10 Junction UNIT - R.R.
8	BULB CONDITION CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the condition of the reversing light bulbs	Move on to Step	Bulbs burnt out	Replace the reversing light bulbs    See in Op. 5550D26 Reversing light BULB - R.R.
9	ELECTRICAL SYSTEM CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check: the continuity/insulation between the dashboard junction unit connector and the bulb connectors the continuity/insulation between the bulbs and the intermediate connection. the continuity/insulation between the intermediate connection and the dashboard junction unit. the continuity/insulation between the bulbs and the earth (Wiring Diagram ) E2022 REVERSING LIGHTS	Move on to Step	wiring faulty	Restore the electrical connection (Wiring Diagram ) E2022 REVERSING LIGHTS
10	CHECK ON CORRECT OPERATION	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the fault is no longer present.