198001402 - 5540BN SPEED SIGNAL CHECK (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 | |
|---|---|---|
| 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. |