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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1007 (Seat Heating System & Seat Cooling System) >> Diagnostic Information and Procedures >> DTC B2508 or B2509 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 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, X4 harness connectors at the MSM.
  2. Test for infinite resistance between the driver seat heating element supply voltage circuit terminal 14 X1 and ground.
    • If less than the specified range, test the supply voltage circuit and the seat cushion and seat back heating element control circuits for a short to ground.
  3. Ignition ON, verify that a test lamp does not illuminate between the supply voltage circuit terminal 14 X1 and ground.
    • If the test lamp illuminates, test the supply voltage circuit and the seat cushion and seat back heating element control circuits for a short to voltage.
  4. Test for infinite resistance between the passenger seat heating element supply voltage circuit terminal 6 X1 and ground.
    • If less than the specified range, test the supply voltage circuit and the seat cushion and seat back heating element control circuits for a short to ground.
  5. Ignition ON, verify that a test lamp does not illuminate between the supply voltage circuit terminal 6 X1 and ground.
    • If the test lamp illuminates, test the supply voltage circuit and the seat cushion and seat back heating element control circuits for a short to voltage.
  6. If all circuits test normal, replace the MSM.
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