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Circuit/System Testing

Lumbar Support Switch Circuit Test

  1. Ignition OFF, disconnect the X2 harness connector at the S64D Seat Adjuster Switch - Driver.
  2. Verify the scan tool lumbar switch parameters listed below are Inactive:
    • Driver Seat Lumbar Horizontal Switch
    • Driver Seat Lumbar Vertical Switch
    • If not Inactive 
    1. Ignition OFF, disconnect the X5 harness connector at the K40 Seat Memory Control Module.
    2. Test for Infinite resistance between the appropriate signal circuit terminal listed below and ground.
      • Lumbar forward switch signal terminal 2
      • Lumbar rearward switch signal terminal 6
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K40 Seat Memory Control Module.
    • If Inactive 
  3. Install a 3 A fused jumper wire between each signal circuit terminal listed below and ground, one at a time.
    • Lumbar forward switch signal terminal 2
    • Lumbar rearward switch signal terminal 6
  4. Verify the scan tool Driver Lumbar Support Horizontal Switch parameter is Forward/Rearward.
    • If not Forward/Rearward 
    1. Ignition OFF, disconnect the X5 harness connector at the K40 Seat Memory Control Module, 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 K40 Seat Memory Control Module.
    • If Forward/Rearward 
  5. Test or replace the S64D Seat Adjuster Switch - Driver.

Lumbar Support Motor Circuit Test

  1. Ignition OFF, disconnect the harness connector at the M53D Seat Lumbar Support Motor - Driver.
  2. Connect a test lamp between control circuit terminal A and control circuit terminal B, ignition ON.
  3. Verify the test lamp turns ON when commanding the Driver Seat Lumbar Support Horizontal Movement Forward and Rearward using the scan tool.
    • If the test lamp remains OFF during either of the commands 
    1. Ignition OFF, disconnect the X3 harness connector at the K40 Seat Memory Control Module.
    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, replace the K40 Seat Memory Control Module.
    • If the test lamp turns ON during each of the commands 
  4. Test or replace the M53D Seat Lumbar Support Motor - Driver.
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