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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 326 (Seat Heating System And Seat Cooling System) >> Diagnostic Information and Procedures >> DTC B2508 or B2509 (Rear Seat) >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition OFF, disconnect the X1 harness connector at the RHSM.
  2. Test for infinite resistance between the control circuit terminal 3 and ground.
    • If not the specified value, test the control circuits listed below for a short to ground:
    • Left rear seat cushion terminal 3
    • Left rear seat cushion terminal 5
  3. Test for infinite resistance between the control circuit terminal 6 and ground.
    • If not the specified value, test the control circuits listed below for a short to ground:
    • Right rear seat cushion terminal 6
    • Right rear seat cushion terminal 2
  4. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal 3 and ground.
    • If the test lamp illuminates, test the control circuits listed below for a short to voltage:
    • Left rear seat cushion terminal 3
    • Left rear seat cushion terminal 5
  5. Verify that a test lamp does not illuminate between the control circuit terminal 6 and ground.
    • If the test lamp illuminates, test the control circuits listed below for a short to voltage:
    • Right rear seat cushion terminal 6
    • Right rear seat cushion terminal 2
  6. If all circuits test normal, replace the RHSM.
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