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Circuit/System Testing

WARNING: This page is about a different car, the 2008 Isuzu i-370, 2008 Isuzu i-290, 2008 GMC Canyon, and 2008 Chevrolet Colorado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect the harness connector at the lumbar adjuster switch.
  2. Test for less than 1 ohm of resistance between the ground circuit terminal A and ground.
    • If greater than 1 ohm, test the ground circuit for an open/high resistance.
  3. 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. Connect the harness connector at the lumbar adjuster switch.
  5. Disconnect the harness connector at the lumbar motor assembly.
  6. Connect a test lamp between the motor control circuit terminals.
  7. Verify that the test lamp illuminates while pressing the lumbar switch in both directions.
    • If the test lamp does not illuminate for both directions, test the motor circuits for a short to ground or an open/high resistance. If the circuits test normal replace the lumbar adjuster switch.
  8. If the circuits test normal replace the lumbar motor assembly.
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