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Home >> Cadillac >> 2005 >> CTS Base, 2.8 T, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 446 (Lighting System) >> Diagnostic Information and Procedures >> Interior Backlighting Malfunction >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2007 Cadillac XLR. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON, observe the scan tool dim select switch parameter while pressing and releasing the dimmer switch. The reading should toggle between ACTIVE and INACTIVE.
    • If the reading does not change between the commanded states, refer to Circuit/System Testing  for Dimmer Switch Malfunction.
  2. Observe the scan tool dim down switch parameter while pressing and releasing the dim down switch. The reading should toggle between ACTIVE and INACTIVE.
    • If the reading does not change between the commanded states, refer to Circuit/System Testing  for Dimmer Switch Malfunction.
  3. Observe the scan tool dim up switch parameter while pressing and releasing the dim up switch. The reading should toggle between ACTIVE and INACTIVE.
    • If the reading does not change between the commanded states, refer to Circuit/System Testing  for Dimmer Switch Malfunction.
  4. If the dimmer switch functions as specified, refer to Circuit/System Testing  for Interior Backlighting Malfunction.
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