198001772 - I050 INTERIOR LIGHTS NOT WORKING (UNDER ANY CIRCUMSTANCES)

The interior lights do not work when the controls are operated.
Test results
1INDIVIDUAL BULB CHECKAll OKProblems encounteredOperation

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 2Courtesy light bulb faultReplace the bulb
Front courtesy light faultRepair or replace the courtesy light    Op. 7040E10 FRONT COURTESY LIGHT - R+R
Rear courtesy light faultyRepair or replace the courtesy light    Op. 7040E14 L/H OR R/H SIDE COURTESY LIGHT (ONE) - R+R
2INTERIOR LIGHTS ELECTRICAL CIRCUIT CHECKAll OKProblems encounteredOperation

Check the following, in order:

  • Body Computer power supply;
  • connections between courtesy lights and Body Computer;
  • connection to courtesy light + 30;
  • courtesy light earth connection See    See E2510 COURTESY LIGHTS
Move on to Step 3Connections not correctRestore the correct connections See    See E2510 COURTESY LIGHTS
Body Computer earth defectiveRestore earth connection See    See E2510 COURTESY LIGHTS
Body Computer power supply defectiveRestore connection See    See E2510 COURTESY LIGHTS
3CHECK SIGNALAll OKProblems encounteredOperation
Check that the Body Computer sends an earth signal to the courtesy light when one of the side doors is openedMove on to Step 4No earth signal from the Body ComputerRestore the correct power supply to the Body Computer. If necessary, replace the Body Computer    Op. 5505A35 MAIN BODY COMPUTER/JUNCTION UNIT - R.R.
4CORRECT OPERATION CHECKAll OKProblems encounteredOperation
Check that the fault is no longer presentEnd of diagnosis.