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Home >> Cadillac >> 2008 >> Escalade EXT >> Repair and Diagnosis (Single Page) >> Body & Frame >> Seats >> Power Seat System >> Diagnostic Information and Procedures >> Lumbar Support Inoperative (With Memory A45) >> Circuit/System Testing >> Lumbar Switch Circuit Test
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Lumbar Switch Circuit Test

  1. Ignition OFF, disconnect the harness connector at the lumbar switch.
  2. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal G and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the MSM.
  3. Verify that all scan tool Memory Seat Module lumbar switch parameters are Inactive.
    • If not the specified value, test the appropriate signal circuit listed below for a short to voltage. If the circuit tests normal, replace the MSM.
      • Lumbar horizontal forward terminal C
      • Lumbar horizontal rearward terminal B
      • Lumbar vertical upward terminal F
      • Lumbar vertical downward terminal A
  4. Install a 3A fused jumper wire between the appropriate signal circuit listed below and the B+ circuit terminal G. Verify the scan tool Lumbar Switch parameter is Active.
    • Lumbar horizontal forward terminal C
    • Lumbar horizontal rearward terminal B
    • Lumbar vertical upward terminal F
    • Lumbar vertical downward terminal A
    • If not the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the MSM.
  5. If all circuits test normal, test or replace the lumbar switch.
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