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Home >> Isuzu >> 2007 >> i-290 LS, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 41 (Power Seat System) >> Diagnostic Information and Procedures >> Lumbar Support Inoperative (w/Memory-A45) >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2007 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.

Lumbar Adjuster Switch Circuit Test

  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 G 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 memory seat module.
  3. Verify that all scan tool Driver Position Module 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 inoperative switch signal circuit terminal and the B+ circuit terminal G. Verify the related scan tool Lumbar Switch parameter is Active.
    • If not Active, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the memory seat module.
  5. If all circuits test normal, test or replace the lumbar adjuster switch.

Motor Control Circuit Test

  1. Disconnect the (C3) harness connector at the memory seay module.
  2. Verify that a test lamp illuminates between the B+ circuit terminal 2 and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  3. Connect the (C3) harness connector at the memory seat module.
  4. Disconnect the (C1) harness connector at the seat lumbar motor assembly.
  5. Connect a test lamp between the motor control circuit terminals of the inoperative motor.
  6. The test lamp should illuminate while pressing the switch in both directions.
    • If the test lamp does not illuminate, test the motor control circuits for an open/high resistance. If the circuits test normal replace the memory seat module.
  7. If all circuits test normal, test or replace the lumbar motor.
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