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Home >> Hummer >> 2009 >> H3 Base, Automatic >> Repair and Diagnosis >> Body & Frame >> Seats >> Power Seat System >> Diagnostic Information and Procedures >> Lumbar Support Inoperative >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the appropriate seat lumbar adjuster switch.
  2. Test for less than 5 ohms between the ground circuit terminal E and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal H 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 motor.
  5. Connect a test lamp between control circuit terminal A and control circuit terminal B.
  6. Operate the lumbar switch in both directions. The test lamp should turn ON when commanding the lumbar motor in both directions.
    • If the test lamp remains OFF during either of the commands, test the control circuits for a short to ground or an open/high resistance. If the circuits test normal, test or replace the lumbar adjuster switch.
  7. If all circuits tests normal, test or replace the seat lumbar motor.
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