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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/Bolster Malfunction (Driver Seat Sedan or Coupe AQ9 with A45 and AHE) >> Component Testing

Component Testing

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.

Lumbar Support Switch

  1. Ignition OFF, disconnect the X1 and X2 harness connector at the S64D Seat Adjuster Switch - Driver.
  2. Test for infinite resistance between the ground terminal 6 X1 and each lumbar signal terminal with the switch in the open position.
    • If less than infinite resistance 

      Replace the S64D Seat Adjuster Switch - Driver.

    • If infinite resistance 
  3. Test for less than 2 Ω between the ground terminal 6 X1 and each lumbar signal terminal with the appropriate switch in the closed position.
    • If 2 Ω or greater 

      Replace the S64D Seat Adjuster Switch - Driver.

    • If less than 2 Ω 
  4. All OK.
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