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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1323 (Seat Heating System & Seat Cooling System) >> Diagnostic Information and Procedures >> Heated/Cooled Seats Inoperative >> Circuit/System Testing >> Driver and Passenger Heated/Cool Seats Inoperative

Driver and Passenger Heated/Cool Seats Inoperative

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the X1 harness connector at the CCSM.
  2. Verify that a test lamp illuminates between the ground circuit terminal M and B+.
    • If the test lamp does not illuminate, test the ground circuit for an open/high resistance.
  3. Verify that a test lamp illuminates between the B+ circuit terminal E and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  4. Disconnect the X2 harness connector at the CCSM.
  5. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 1 and ground.
    • If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
  6. If all circuits test normal, replace the CCSM.
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