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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 >> Heated Seat Inoperative (Cadillac) >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition ON, verify that the HVAC module driver and passenger heated seat switch parameters display Active while any of the heated seat switches are pressed.
    • If either of the switch parameters are continuously Active or Inactive while any of the headed seat switches are pressed, replace the HVAC control module.
  2. Verify that the MSM driver and passenger seat HVC mode and level parameters are displayed correctly as the heated seat switches are activated through all of the operating modes.
    • If the MSM parameters are not displayed correctly replace the MSM.
  3. If the circuits test normal replace the HVAC control module.
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