| STEP | OPERATIONS TO BE CARRIED OUT | TEST RESULTS |
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| 0 | PRELIMINARY CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
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| Check fuse condition See E3022 HEADLAMP WASHER | Move on to Step | Fuse/s blown | Replace fuse/s and find out what could have caused them to blow |
| 1 | HEADLAMP WASHER ELECTRICAL CIRCUIT CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
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| Check the following, in order:- Connections between battery and engine bay junction unit
- Connections between engine bay junction unit and underfacia junction unit
- Connections between battery, ignition switch and underfacia junction unit
- Connections between stalk unit and switch control unit
- Connections between switch control unit and headlamp washer motor;
- Stalk unit earth
- Headlamp washer motor earth
- Connections between underfacia junction unit and switch control unit
| 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 E3022 HEADLAMP WASHER |
| 2 | STEERING COLUMN SWITCH UNIT CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
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| - Correct stalk unit power supply/earths
- Check that an operational output voltage to the switch control unit is present when the stalk switch is operated
| Move on to Step | 1. Power supplies/earths incorrect | 1. Restore correct power supplies/earths See E3022 HEADLAMP WASHER |
| 2. Stalk unit not working properly | 2. Replace the steering column switch unit Op. 5550A12 COMPLETE STALK UNIT - R+R FOR VERSIONS WITH AIR BAG |
| 3 | SWITCH CONTROL UNIT CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
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| Check the following, in order: See E3022 HEADLAMP WASHER- Correct switch control unit power supply/earths
- Check that an earth output is produced to control the headlamp washer relay when a signal is activated from stalk unit to switch control unit.
| Move on to Step | 1. Power supplies/earths incorrect | 1. Restore correct power supplies/earths See E3022 HEADLAMP WASHER |
| 2. Switch control unit fault | 2. Replace switch control unit Op. 5505A24 W/L AND SERVICE SWITCH MOUNT - R+R |
| 4 | CHECK ON CORRECT OPERATION | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
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| Check that the fault is no longer present | | | |