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Home >> Cadillac >> 2007 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 1986 (Power Seat System) >> Diagnostic Information and Procedures >> Lumbar Support Inoperative (Without Memory A45) >> Circuit/System Testing
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Circuit/System Testing

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  1. Ignition OFF, disconnect the harness connector at the lumbar switch.
  2. Test for less than 5 ohms between the ground circuit terminal E and ground.
    • If greater than the specified value, test the ground circuit for an open/high resistance.
  3. 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.
  4. Ignition OFF, connect the harness connector at the lumbar switch and disconnect the harness connector at the lumbar adjuster motor assembly.
  5. Ignition ON, verify that the test lamp illuminates between the appropriate control circuits listed below while pressing the lumbar switch in both directions.
    • Lumbar horizontal motor terminal C and terminal D
    • Lumbar vertical motor terminal A and terminal B
    • If the test lamp does not illuminate for both directions, test the control circuits for a short to ground or an open/high resistance. If the circuits test normal, test or replace the lumbar switch.
  6. If all circuits test normal, test or replace the lumbar adjuster assembly.
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