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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 207 (Seat Heating System & Seat Cooling System) >> Diagnostic Information and Procedures >> Heated/Cooled Seats Inoperative >> Circuit/System Verification

Circuit/System Verification

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  1. Ignition ON, observe the HVAC control panel while pressing and releasing the appropriate heated or cooled seat switch. The appropriate switch symbol should be displayed on the control panel.
    • If the symbol is not displayed, replace the HVAC control module.
  2. Operate the driver and passenger heated and cooled seats through the modes of operation listed below. The seat should operate in all three modes.
    • Seat back and cushion heat mode
    • Back only heat mode
    • Cool mode
    • If both, the driver and passenger heated/cool seats are inoperative, refer to Driver and Passenger Heated/Cool Seats Inoperative below.
    • If the driver heated/cool seat is inoperative, refer to Driver Heated/Cool Seat Inoperative below.
    • If the passenger heated/cool seat is inoperative, refer to Passenger Heated/Cool Seat Inoperative below.
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