72550 - J30 THE WINDSCREEN IS NOT AUTOMATICALLY CLEANED WHEN IT RAINS

the automatic activation of the windscreen wiper is achieved bymoving the right stalk unit lever into the AUTO position and the engagement of the function via the rain sensor is signalled by a single stroke of the windscreen wiper;A possible fault in the rain sensor or the serial line between the rain sensor roof control unit and the body computer is shown in the matrix display.

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 connector and check the following at the Body Computer Node: In errors ambient that there are no faults In active diagnosis ambient carry out the rain sensor check	Move on to Step	1. Presence of faults	1. Continue following the instructions in the diagnostic table
			2. Rain sensor faulty	Move on to Step
2	ELECTRICAL SYSTEM CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the connections between the roof node control unit and the rain sensor (Wiring Diagram ) E3020 WINDSCREEN WASH/WIPE	Move on to Step	Connection faulty	Restore the electrical connection (Wiring Diagram ) E3020 WINDSCREEN WASH/WIPE
3	ELECTRICAL SYSTEM CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the connections between the roof node control unit, the body computer and the windscreen wiper control unit (Wiring Diagram ) E3020 WINDSCREEN WASH/WIPE	Move on to Step	Serial line broken	Restore the electrical connection (Wiring Diagram ) E3020 WINDSCREEN WASH/WIPE
4	CHECK ON CORRECT OPERATION	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the fault is no longer present		Fault persists	Replace the rain sensor    See in Op. 5050B64 rain sensor electronic unit r r
5	CHECK ON CORRECT OPERATION	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the fault is no longer present		Fault persists	Replace body computer    See in Op. 5505A32 BODY COMPUTER - R.R.