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Home >> Cadillac >> 2012 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 1343 (Power Seat System) >> Diagnostic Information and Procedures >> Power Seat Inoperative (With Memory A45) >> Circuit/System Testing >> Seat Motor Control Circuit Test
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Seat Motor Control Circuit Test

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the X3 harness connector at the MSM.
  2. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 5 and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  3. Ignition OFF, connect the X3 harness connector at the MSM and disconnect the X1 harness connector at the seat adjuster motor assembly.
  4. Connect a test lamp between the appropriate control circuits listed below:
    • Seat horizontal motor terminal 3 and terminal 6
    • Seat front vertical motor terminal 2 and terminal 5
    • Seat rear vertical motor terminal 1 and terminal 4
  5. Ignition ON, command the appropriate seat motor in the Up/Down or Forward/Rearward directions with a scan tool. The test lamp should turn ON when commanding the up and down or forward and rearward states.
    • If the test lamp remains OFF during either of the commands, test the control circuits for an open/high resistance. If the circuits test normal replace the MSM.
  6. If all circuits test normal, test or replace the seat motor.
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