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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 (Driver Seat Coupe with AQ9 without A45) >> 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 X5 harness connector at the K40D Seat Memory Control Module - Driver, ignition ON.
  2. Connect a test lamp between each signal circuit terminal listed below and B+, one at a time.
    • Lumbar forward terminal 14
    • Lumbar rearward terminal 15
  3. Verify the test lamp turns ON and OFF when pressing and releasing the appropriate lumbar switch.
    • If the test lamp is always OFF 
    1. Ignition OFF, disconnect the X2 harness connector at the S64D Seat Adjuster Switch - Driver, ignition ON.
    2. Test for less than 1 V between the signal circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V
    3. Test for less than 2 Ω in the 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 S64D Seat Adjuster Switch - Driver.
    • If the test lamp is always ON 
    1. Ignition OFF, disconnect the X2 harness connector at the S64D Seat Adjuster Switch - Driver.
    2. Test for Infinite resistance between the signal circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, test or replace the S64D Seat Adjuster Switch - Driver
    • If the test lamp turns ON and OFF 
  4. Ignition OFF, connect the X5 harness connector at the K40D Seat Memory Control Module - Driver and disconnect the harness connector at the A14D Seat Lumbar Support Pump - Driver.
  5. Connect a test lamp between control circuit terminal 2 and control circuit terminal 5, ignition ON.
  6. Verify the test lamp turns ON when pressing the lumbar switch in both directions.
    • If test lamp remains OFF during either of the commands 
    1. Ignition OFF, remove the test lamp, disconnect the X3 harness connector at the K40D Seat Memory Control Module - Driver, ignition ON.
    2. Test for less than 1 V between each control circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V
    3. Ignition OFF.
    4. Test infinite resistance between each control circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    5. Test for less than 2 Ω between each control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K40D Seat Memory Control Module - Driver.
    • If the test lamp turns ON during each of the commands 
  7. Test or replace the A14D Seat Lumbar Support Pump - Driver.
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