| 1 | INDIVIDUAL BULB CHECK | All OK | Problems encountered | Operation |
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| Check:- the condition of the individual bulbs;- the condition of the bulb holder assemblies;- the state and operation of the courtesy light switches. | Move on to Step 2 | 1. Courtesy light bulb faulty.2. Front courtesy light faulty.3. Rear courtesy light faulty. | 1. Replace the bulb.2. Repair or replace the courtesy light Op. 7040E10 FRONT COURTESY LIGHT - R+R 3. Repair or replace the courtesy light Op. 7040E16 REAR COURTESY LIGHT - R+R |
| 2 | INTERIOR LIGHTS ELECTRICAL CIRCUIT CHECK | All OK | Problems encountered | Operation |
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| Check the following, in order:- Body Computer power supply;- connections between the courtesy light and Body Computer;- connection to courtesy light + 30;- courtesy light earth connection See E2510 COURTESY LIGHTS | Move on to Step 4 | 1. Body Computer power supply incorrect.2. Connections between the courtesy lights and the Body Computer not correct.3. Interior lights not correctly earthed. | 1. Restore correct power supply See E2510 COURTESY LIGHTS 2. Restore the correct connections See E2510 COURTESY LIGHTS 3. Restore the correct earth connection See E2510 COURTESY LIGHTS |
| 3 | SIGNAL CHECK | All OK | Problems encountered | Operation |
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| Check that the Body Computer sends a voltage signal to the courtesy light when one of the side doors is opened. | End of diagnosis. | No voltage signal from the Body Computer. | Replace Body Computer Op. 5505A35 MAIN BODY COMPUTER/JUNCTION UNIT - R.R. |