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Home >> Isuzu >> 2007 >> i-290 LS, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 39 (Lighting Systems) >> Diagnostic Information and Procedures >> Interior Backlighting Malfunction >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2007 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON, observe the driver door switch while commanding the Driver Door Switch Integrated Sw. Backlighting Test ON and OFF with a scan tool. The switch backlighting should turn ON and OFF between commanded states.
    • If the backlighting does not turn On and OFF or remains always ON, replace the driver door switch.
  2. Ignition ON, observe the driver heated and cooled seat switch while commanding the Driver Door Switch Non-Integrated Sw. Backlighting Test ON and OFF with a scan tool. The switch backlighting should turn ON and OFF between commanded states.
    • If the backlighting does not turn On and OFF or remains always ON, refer to Front Door Switch Backlighting Circuit Test.
  3. Ignition ON, observe the passenger door switch while commanding the Passenger Door Switch Integrated Sw. Backlighting Test ON and OFF with a scan tool. The switch backlighting should turn ON and OFF between commanded states.
    • If the parameter does not cycle between the specified values, refer to Turn Signal/Multifunction Switch Test.
  4. Ignition ON, observe the passenger heated and cooled seat switch while commanding the Passenger Door Switch Non-Integrated Sw. Backlighting Test ON and OFF with a scan tool. The switch backlighting should turn ON and OFF between commanded states.
    • If the backlighting does not turn On and OFF or remains always ON, refer to Front Door Switch Backlighting Circuit Test.
  5. Ignition ON, observe the scan tool BCM Dimming Control Signal parameter while operating the dimmer switch from high to low. The reading should change from a high percent to a low percent as the switch is rotated.
    • If the reading does not change, refer to Dimmer Switch Circuit Test.
    • If the scan tool dimmer control operates normal, refer to Interior Backlighting Circuit Test.
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