| STEP | OPERATIONS TO BE CARRIED OUT | TEST RESULTS |
|---|
| 1 | INDIVIDUAL LIGHT CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
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| Check condition of the bulbs and associated bulb holder unit | Move on to Step | 1. Bulbs damaged | 1. Change the bulbs Op. 5540B24 MAIN HEADLAMP BULB (1), LH OR RH - R R |
| 2. Front light cluster fault | 2. Repair or replace the front light cluster Op. 5540B10 EXTERIOR LIGHT DIMMER RESISTOR - R+R |
| 2 | MAIN BEAM ELECTRICAL CIRCUIT CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
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| Check the following, in order:- Main beam fuse;
- Connections between battery, engine bay control unit, main beam relay and bulbs;
- Bulb earth
| Move on to Step | 1. Component defective | 1. Replace defective component (in the case of a fuse, find out what caused it to blow) |
| 2. Connections interrupted | 2. Repair the connections See E2012 MAIN BEAM HEADLAMPS |
| 3 | MAIN BEAM ELECTRICAL CIRCUIT CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Check the following, in order:- Connections between battery, ignition switch, engine bay control unit, main beam relay, switch control unit and stalk unit
- Stalk switch unit earth;
| Move on to Step | 1. Component defective | 1. 1. Replace defective component (in the case of a fuse, find out what caused it to blow) |
| 2. Connections interrupted | 2. Repair the connections See E2012 MAIN BEAM HEADLAMPS |
| 4 | STEERING COLUMN SWITCH UNIT CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Check that the stalk unit is working properly: particularly the main beam selector See E2012 MAIN BEAM HEADLAMPS | Move on to Step | Stalk unit not working properly | Replace the steering column switch unit Op. 5550A12 COMPLETE STALK UNIT - R+R FOR VERSIONS WITH AIR BAG |
| 5 | CHECK MAIN BEAM RELAY | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Check the main beam relay is working properly See E2012 MAIN BEAM HEADLAMPS | Move on to Step | Main beam relay not working properly | Change the main beam relay Op. 5550A12 COMPLETE STALK UNIT - R+R FOR VERSIONS WITH AIR BAG |
| 6 | IGNITION SWITCH CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Check the ignition switch is operating correctly: particularly the main beam supply relay See E2012 MAIN BEAM HEADLAMPS | Move on to Step | Ignition switch fault | Repair or replace the ignition switch Op. 5520A12 IGNITION SWITCH ASSEMBLY - R R FOR VERSIONS WITH AIR BAG |
| 7 | SWITCH CONTROL UNIT CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
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| Check the following, in order:- Correct power supply to switch control unit
- Check that when an earth signal is activated from the stalk unit to the switch control unit, an earth signal leaves the switch control unit to control the main beam relay
| Move on to Step | 1. Connections interrupted | 1. Repair the connections See E2012 MAIN BEAM HEADLAMPS |
| 2. Switch control unit fault | 2. Change the switch control unit |
| 8 | ENGINE BAY CONTROL UNIT CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
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| Check the following, in order:- Correct engine bay control unit power supplies;
- Check that when an earth signal is activated from the switch control unit to the engine bay control unit, a battery voltage output is generated to control the bulbs.
| Move on to Step | 1. Connections interrupted | 1. Repair the connections See E2012 MAIN BEAM HEADLAMPS |
| 2. Engine bay control unit fault | 2. Change engine bay control unit Op. 5505A13 SUPPLEMENTARY JUNCTION CONTROL UNIT IN ENGINE BAY - R R |
| 9 | CHECK ON CORRECT OPERATION | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Check that the fault is no longer present | | | |