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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 (Passenger Seat Coupe with AQ9 and AE8) >> Circuit/System Testing

Circuit/System 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.
  1. Ignition OFF, disconnect the harness connector at the G31P Seat Lumbar/Bolster Pump - Passenger.
  2. Connect a test lamp between the appropriate lumbar or bolster control circuit terminals listed below, ignition ON.
    • Lumbar control circuit terminal 5 and control circuit terminal 2
    • Seat side bolster control circuit terminal 1 and control circuit terminal 3
  3. Verify the test lamp turns ON when pressing the appropriate lumbar or bolster switch in both directions.
    • If the test lamp remains OFF during either of the commands 
    1. Ignition OFF, disconnect the X2 harness connector at the S64P Seat Adjuster Switch - Passenger.
    2. Test for infinite resistance between each control circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in each control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, test or replace the S64P Seat Adjuster Switch - Passenger.
    • If the test lamp turns ON during each of the commands 
  4. Test or replace the G31P Seat Lumbar/Bolster Pump - Passenger.
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