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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1132 (Power Seat System) >> Diagnostic Information and Procedures >> DTC B3920 or B3921 >> Circuit/System Testing

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. Ignition OFF, disconnect the X1 harness connector at the MSM.
  2. Ignition ON, verify that a test lamp does not illuminate between any of the following motor control circuit terminals and ground:
    • Front vertical motor terminal 12
    • Front vertical motor terminal 13
    • Rear vertical motor terminal 15
    • Rear vertical motor terminal 16
    • Seat horizontal motor terminal 9
    • Seat horizontal motor terminal 10
    • If the test lamp illuminates, test the control circuit for a short to voltage.
  3. Test for infinite resistance between the following motor control circuit terminals and ground:
    • Front vertical motor terminal 12
    • Front vertical motor terminal 13
    • Rear vertical motor terminal 15
    • Rear vertical motor terminal 16
    • Seat horizontal motor terminal 9
    • Seat horizontal motor terminal 10
    • If less than infinite resistance, test the motor control circuit for a short to ground.
  4. Test for greater resistance values than specified between the following motor control circuits:
    • 1 ohm between the front vertical motor terminal 12 and terminal 13
    • 1 ohm between the rear vertical motor terminal 15 and terminal 16
    • 1 ohm between the seat horizontal motor terminal 9 and terminal 10
    • If less than the specified resistance, test the control circuits for a short together or a shorted motor.
  5. Ignition OFF, disconnect the X4 harness connector at the MSM.
  6. Ignition ON, verify that a test does not illuminate between any of the following motor control circuit terminals and ground:
    • Lumbar horizontal motor terminal 12
    • Lumbar horizontal motor terminal 13
    • Seat recline motor terminal 15
    • Seat recline motor terminal 16
    • If the test lamp illuminates, test the control circuit for a short to voltage.
  7. Test for infinite resistance between the following motor control circuit terminals and ground:
    • Lumbar horizontal motor terminal 12
    • Lumbar horizontal motor terminal 13
    • Seat recline motor terminal 15
    • Seat recline motor terminal 16
    • If less than infinite resistance, test the motor control circuit for a short to ground.
  8. Test for greater resistance values than specified between the following motor control circuits:
    • 4 ohms between the lumbar horizontal motor terminal 12 and terminal 13
    • 2 ohms between the recline motor terminal 15 and terminal 16
    • If less than the specified resistance, test the control circuits for a short together or a shorted motor.
  9. If all circuits test normal, replace the memory seat module.
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