17 · Electrical

Bidirectional serial line check

Electrical equipmentBidirectional serial line check

BIDIRECTIONAL SERIAL LINE CHECK

Check 5540BL

2.2 JTS, 3.2 JTS · Gas discharge headlamps

	CHECK TO BE PERFORMED	RESOLUTION IF THE CHECK IS NOT OK
1	Disconnect the wiring of the master headlamp 14-way connector. Disconnect the wiring of the slave headlamp 14-way connector. Connect the diagnostic tester in ohmmeter mode and check the continuity between Pin 12 of the headlamp vehicle side wiring 14-way connector See F010 LEFT HEADLAMP and Pin 12 of the headlamp vehicle wiring 14-way connector See F011 RIGHT HEADLAMP	Restore wiring continuity See E2011 DIPPED HEADLAMPS
2	With the headlamp 14-way connectors disconnected, check the insulation to earth by connecting across Pin 12 of each of the connectors and Earth	Restore insulation See E2011 DIPPED HEADLAMPS
3	Check the continuity across Pin 12 of the headlamp 14 way connector See F010 LEFT HEADLAMP and Pin 14 of the 21-way connector for connection to the Ballast control unit	Replace the Master headlamp Op. 5540B81 LEFT GAS DISCHARGE LIGHT CLUSTER - R.R.
4	Check the continuity across Pin 12 of the headlamp 14 way connector See F011 RIGHT HEADLAMP and Pin 14 of the 21-way connector for connection to the Ballast control unit	Replace the slave headlamp Op. 5540B82 RIGHT GAS DISCHARGE LIGHT CLUSTER - R.R.

A - Electrical connector

B - Shielded cable

2.4 JTD 20v · Gas discharge headlamps

STEP	CHECK TO BE PERFORMED	RESOLUTION IF THE CHECK IS NOT OK
1	Disconnect the wiring of the master headlamp 14-way connector. Disconnect the wiring of the slave headlamp 14-way connector. Connect the diagnostic tester in ohmmeter mode and check the continuity between Pin 12 of the headlamp vehicle side wiring 14-way connector See F010 LEFT HEADLAMP and Pin 12 of the headlamp vehicle wiring 14-way connector See F011 RIGHT HEADLAMP	Restore wiring continuity See E2011 DIPPED HEADLAMPS
2	With the headlamp 14-way connectors disconnected, check the insulation to earth by connecting across Pin 12 Pin 12 of each of the connectors and Earth	Restore insulation See E2011 DIPPED HEADLAMPS
3	Check the continuity across Pin 12 of the headlamp 14 way connector See F010 LEFT HEADLAMP and Pin 14 of the 21-way connector for connection to the Ballast control unit	Replace the Master headlamp Op. 5540B81 LEFT GAS DISCHARGE LIGHT CLUSTER - R.R.
4	Check the continuity across Pin 12 of the headlamp 14 way connector See F011 RIGHT HEADLAMP and Pin 14 of the 21-way connector for connection to the Ballast control unit	Replace the slave headlamp Op. 5540B82 RIGHT GAS DISCHARGE LIGHT CLUSTER - R.R.

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