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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 272 (Power Seat System) >> Diagnostic Information and Procedures >> Lumbar Support Malfunction (Passenger Seat Sedan with AQ9 and with or without AE8) >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON.
  2. Verify that all passenger power seat functions operate when being controlled by the S64P Seat Adjuster Switch - Passenger.
    • If all power seat functions operate 
  3. Verify the A14P Seat Lumbar Support Pump - Passenger turns ON when the lumbar switch is pressed in the Forward direction. The lumbar support bladder should inflate until the bladder is 100% inflated or the switch is released.
    • If the pump does not turn ON or the bladder does not inflate 

      Refer to Circuit/System Testing

    • If the pump turns ON and the bladder inflates 
  4. Verify the lumbar support bladder deflates when the lumbar switch is pressed in the rearward. The bladder should deflate until it is 100% deflated or the switch is released
    • If the bladder does not deflate 

      Refer to Circuit/System Testing

    • If the bladder deflates 
  5. All OK.