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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1087 (Lighting Systems) >> Diagnostic Information and Procedures >> DTC B2652 >> Circuit/System Testing >> I/P Lamps Dimmer Switch Signal Malfunction

I/P Lamps Dimmer Switch Signal Malfunction

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the X2 harness connector at the BCM.
  2. Verify that a test lamp illuminates between the BCM 7 fuse voltage supply circuit terminal 2 and ground.
    • If the test lamp does not illuminate, test the voltage supply circuit for a short to ground or an open/high resistance.
  3. Reconnect the X2 harness connector at the BCM.
  4. Ignition ON, with a scan tool clear all DTCs.
  5. Ignition OFF, disconnect the harness connectors at the following components:
    • Power window switch - LR
    • Power window switch - RR
    • PRNDL lamp
    • Sunroof control switch
    • Sunroof shade switch
  6. Ignition ON, operate the vehicle within the conditions for running the DTC and verify the DTC does not reset.
    • If the DTC resets, test the I/P lamps dimmer switch signal circuit for a short to ground. If the circuits test normal, replace the BCM.
  7. Reconnect each component one at a time and verify that the DTC does not reset as current.
    • If the DTC resets as current, test or replace the component responsible for setting the DTC.
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