125000550 - I59 INTERIOR LIGHTS DO NOT GO OFF/COME ON GRADUALLY

The interior timed lights work when controlled manually, but the dimmer doesn''t work when the doors are opened.
When one of the side doors is opened, the courtesy light is turned on for a period of 3 minutes and the lights are switched on/off gradually (dimmer effect). When the car is unlocked after activation of the remote control, the courtesy light is switched on for a period of 15 seconds, but it is switched off by the ignition ON signal. If the ignition ON signal is present following the opening of a door, the courtesy lights come on.
Results of the tests
1CHECK ON INDIVIDUAL LIGHTSAll OKProblems metOperation
Check the condition of the individual bulbs and bulb holders, and the condition and operation of the courtesy light switches.Continue to Step 2Faulty bulb or front courtesy lightRestore or replace the courtesy light Op.    Op. 7040E40 MODULAR FRONT COURTESY LIGHT - R R
Faulty bulb or rear courtesy light.Restore or replace the courtesy light Op.    Op. 7040E16 REAR COURTESY LIGHT - R+R
Switches not correctly positionedRestore the switches to their correct position
2CHECK ON INTERIOR LIGHTING ELECTRICAL CIRCUITAll OKProblems metOperation

Check:

  • Body Computer power supply:
  • Connections between switches in lock and Body Computer;
  • Connections between courtesy lights and Body Computer;
  • Connection to +30 courtesy lights;
  • Courtesy light earth connection See    See E2510 COURTESY LIGHTS
Continue to Step 3Connections not correctRestore the correct connections See    See E2510 COURTESY LIGHTS
Body Computer earth faultyRestore the earth connection See    See E2510 COURTESY LIGHTS
Faulty Body Computer supplyRestore the supply connection See    See E2510 COURTESY LIGHTS
3CHECK ON CORRECT OPERATIONAll OKProblems metOperation
Check that the fault is no longer presentEnd of diagnosisDimmer not workingReplace the Body Computer Op.    Op. 5505A32 BODY COMPUTER - R R