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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 Sedan with AQ9 and A45 without AHE) >> 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.

Seat Lumbar Support Switch Circuit Test

  1. Ignition OFF, disconnect the X2 harness connector at the S64D Seat Adjuster Switch - Driver, ignition ON.
  2. Install a 3 A fused jumper wire between the appropriate signal circuit terminal listed below and ground.
    • Seat lumbar forward terminal 2
    • Seat lumbar rearward terminal 6
  3. Verify the scan tool Driver Lumbar Support Horizontal Switch parameter is Forward or Rearward.
    • If not Forward or Rearward 
    1. Ignition OFF, remove the jumper wire, disconnect the X5 harness connector at the K40D Seat Memory Control Module - 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 signal 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 Forward or Rearward 
  4. Test or replace the S64D Seat Adjuster Switch - Driver.

Seat Lumbar Support Pump Circuit Test

  1. Ignition OFF, disconnect the harness connector at the A14D Seat Lumbar Support Pump - Driver.
  2. Connect a test lamp between control circuit terminal 2 and control circuit terminal 5, ignition ON.
  3. Verify the test lamp turns ON when commanding the lumbar support Forward and Rearward with a scan tool.
    • If the 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.
    2. 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
    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, replace the K40D Seat Memory Control Module - Driver.
    • If the test lamp turns ON during each of the commands 
  4. Test or replace the A14D Seat Lumbar Support Pump - Driver.
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