16 · Electrical

Speed signal check

Electrical equipmentSpeed signal check

SPEED SIGNAL CHECK

Check 5540BN

Xenon Gas headlamps

	CHECK TO BE PERFORMED	REMEDIAL ACTION IF THE CHECK IS NOT OK
1	Turn on the diagnostic tool and go to the Instruments setting. In Voltmeter mode, select an end-of-scale value of 20 V and a time base of 2 seconds. Connect the voltmeter red probe to Pin 10 of the master headlamp 14-way connector See F010 LEFT HEADLAMP and the black 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 downloaded looks like the attached graph, without any gaps. The test is complete.	Move on to Step 2

CHECK TO BE PERFORMED

REMEDIAL ACTION IF THE CHECK IS NOT OK

Turn on the diagnostic tool and go to the Instruments setting.

In Voltmeter mode, select an end-of-scale value of 20 V and a time base of 2 seconds.

Connect the voltmeter red probe to Pin 10 of the master headlamp 14-way connector

and the black 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 downloaded looks like the attached graph, without any gaps. The test is complete.

Move on to Step 2

Speed signal

	CHECK TO BE PERFORMED	REMEDIAL ACTION IF THE CHECK IS NOT OK
2	Check for wiring continuity between Pin 28 of Body Computer connector B See M001 BODY COMPUTER , and 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 E7023 ESP	Replace Body Computer Op. 5505A35 MAIN BODY COMPUTER/JUNCTION UNIT - R.R.
5	Check that the fault is no longer present	Replace the Master headlamp Op. 5540B81 LEFT GAS DISCHARGE LIGHT CLUSTER - R.R.

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