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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 909 (Power Seat System) >> Diagnostic Information and Procedures >> Power Seat Inoperative (w/o Memory) >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect the seat adjuster or power lumbar switch connector.
  2. Verify that a test lamp illuminates when connected from battery voltage to the ground circuit terminal.
    • If the test lamp does not illuminate, repair the ground circuit for an open/high resistance.
  3. Verify that a test lamp illuminates when connected from the battery supply circuit terminal to ground.
    • If the test lamp does not illuminate, repair the battery supply circuit for an open/high resistance or short to ground.
  4. Connect the seat adjuster or power lumbar switch connector and disconnect the inoperative motor assembly connector.
  5. Connect a test lamp across the inoperative motor control circuit terminals.
  6. Verify that the test lamp illuminates when the appropriate switch is pressed.
    • If the test lamp does not illuminate, repair the motor circuits for an open/high resistance or short to ground. If the circuits test normal replace the seat adjuster or power lumbar switch.
  7. If the circuits test normal, replace the inoperative motor assembly.
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