199000819 - I059 INTERIOR LIGHTS DO NOT GO OFF / COME ON GRADUALLY

The timed interior lights operate when controlled manually, but the dimmer does not work when the doors are opened.
When one of the side doors is opened, the courtesy light timer comes on for 3 minutes and light activation/deactivation is gradual (dimmed) When the vehicle is unlocked after operating the remote control, the courtesy light comes on for 15 seconds, which is interrupted by the key on signal. If the key on signal is present continuously after opening a door, the courtesy lights come on.
Test results
1INDIVIDUAL BULB CHECKAll OKProblems encounteredOperation
Check courtesy light switch condition and operationMove on to Step 21. Courtesy light contacts defective2. Switches incorrectly positioned1. Repair or replace the courtesy light    Op. 7040E10 FRONT COURTESY LIGHT - R+R 2. Restore switch position
2INTERIOR LIGHTS ELECTRICAL CIRCUIT CHECKAll OKProblems encounteredOperation
Check:- Body Computer power supply;- connections between the switches on the lock and Body Computer;- 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 31. Connections not correct2. Body Computer earth defective3. Body Computer power supply defective1. Restore the correct connections    See E2510 COURTESY LIGHTS 2. Restore earth connection    See E2510 COURTESY LIGHTS 3. Restore power supply connection    See E2510 COURTESY LIGHTS
3CHECK ON CORRECT OPERATIONAll OKProblems encounteredOperation
Check that the fault is no longer presentEnd of diagnosisThe fault persistsReplace Body Computer    Op. 5505A32 BODY COMPUTER - R.R