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Home >> Cadillac >> 2007 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 1183 (Power Seat System) >> Diagnostic Information and Procedures >> Lumbar Support Inoperative (w/o Memory A45) >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2008 Cadillac CTS. 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 C 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 D 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 control circuit terminal 1 and control circuit terminal 2.
  7. Press the lumbar switch in the Forward and Rearward directions. The test lamp should turn ON, when the switch is pressed in the Forward and Rearward directions.
    • If the test lamp remains OFF for either direction, test the control 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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