125000543 - I50 INTERIOR LIGHTS NOT WORKING / UNDER NO CIRCUMSTANCES

The interior lights do not work when the relevant controls are operated.
Results of the tests
1CHECK ON INDIVIDUAL LIGHTSAll OKProblems metOperation

Check:

  • the condition of the individual bulbs
  • the condition of the bulb holders
  • state and operation of courtesy light switches
Continue to Step 2Courtesy light bulb faultyChange the bulb
Front courtesy light faultyRestore or replace the courtesy light Op.    Op. 7040E40 MODULAR FRONT COURTESY LIGHT - R R
Rear courtesy light faultyRestore or replace the courtesy light Op.    Op. 7040E16 REAR COURTESY LIGHT - R+R
2CHECK ON INTERIOR LIGHTING ELECTRICAL CIRCUITAll OKProblems metOperation

Check, in order:

  • Body Computer supply
  • 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 connection See    See E2510 COURTESY LIGHTS
3CHECK ON SIGNALAll OKProblems metOperation
Check that when one of the side doors is opened, an earth signal is sent from the Body Computer to the courtesy lightContinue to Step 4No earth signal from Body ComputerRestore the correct supply to the Body Computer. If necessary, replace the Body Computer Op.    Op. 5505A32 BODY COMPUTER - R R
4CHECK ON CORRECT OPERATIONAll OKProblems metOperation
Check that the fault is no longer presentEnd of diagnosis.