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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 113 (Seat Heating System & Seat Cooling System) >> Diagnostic Information and Procedures >> DTC B2508 or B2509 (Front Seat) >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition OFF, disconnect the MSM connectors C1 and C4.
  2. Test for infinite resistance between the left seat heating element supply voltage circuit terminal 14 and ground.
    • If less than infinite, 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 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 right seat heating element supply voltage circuit terminal 6 and ground.
    • If less than infinite, 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 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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