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Home >> Cadillac >> 2012 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 1132 (Power Seat System) >> Diagnostic Information and Procedures >> Lumbar Support Inoperative (with Memory A45) >> Circuit/System Testing >> Lumbar Adjuster Switch Circuit Test
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Lumbar Adjuster Switch Circuit Test

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the lumbar adjuster switch.
  2. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal D 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 the scan tool lumbar switch input parameters are Inactive.
    • If not Inactive, test the appropriate signal circuit for a short to voltage. If the circuit tests normal, replace the memory seat module.
  4. Install a 3A fused jumper wire between the B+ circuit terminal D and appropriate switch signal circuit terminal listed below. Verify the related scan tool Lumbar Switch parameter is Active.
    • Lumbar forward terminal E
    • Lumbar rearward terminal B
    • If not Active, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the MSM.
  5. If all circuits test normal, test or replace the lumbar adjuster switch.
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