194003973 - 5540BN SPEED SIGNAL CHECK (ABS)

STEP	CHECK TO BE PERFORMED	RESOLUTION IF THE CHECK IS NOT OK
1	Turn on the diagnostic tester and go to Instruments. While in Voltmeter mode, select a full scale deflection of 20 V and a time base of 2 s.Connect the voltmeter red probe to Pin 10 of the master headlamp 14-way connector    See F010 LEFT HEADLAMPand the red probe to earth.Turn one wheel by hand and when the speed is 4-6 km/h press the START button.Check that the signal acquired looks the attached graph without any dips.The test can be considered over	Move on to Step 2

STEP	CHECK TO BE PERFORMED	RESOLUTION IF THE CHECK IS NOT OK
2	Check for wiring continuity between Pin 28 of Body Computer connector B    See M001 BODY COMPUTERand Pin 10 of the master headlamp 14-way connector.    See F010 LEFT HEADLAMP	The test can be considered over
3	Check for wheel speed signal errors in the ABS control unit	Continue as instructed by the diagnostic equipment
4	Check for wiring continuity between the ABS control unit and the Body Computer    See E7020 ABS	Replace Body ComputerOp. 5505A32 BODY COMPUTER - R.R
5	Check that the fault is no longer present	Replace the Master headlamp    Op. 5540B81 LEFT GAS DISCHARGE LIGHT CLUSTER - R.R.