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Home >> Pontiac >> 2009 >> Vibe Base, 2.4 0, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 46 (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 2009 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.

B3920 01 or B3920 02

  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 control circuits listed below 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 control circuits listed below 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 not the specified value, test the control circuit for a short to ground.
  4. Ignition OFF, disconnect the X4 harness connector at the MSM.
  5. Ignition ON, verify that a test lamp does not illuminate between control circuits listed below 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.
  6. Test for infinite resistance between the control circuits listed below and ground:
    • Lumbar horizontal motor terminal 12
    • Lumbar horizontal motor terminal 13
    • Seat recline motor terminal 15
    • Seat recline motor terminal 16
    • If not the specified value, test the control circuit for a short to ground.
  7. If all circuits test normal, replace the MSM.

B3921 01 or B3921 02

  1. Ignition OFF, disconnect the X4 harness connector at the MSM.
  2. Ignition ON, verify that a test lamp does not illuminate between control circuits listed below and ground:
    • Driver seat lumbar vertical motor terminal 1
    • Driver seat lumbar vertical motor terminal 2
    • Passenger seat lumbar vertical motor terminal 4
    • Passenger seat lumbar vertical motor terminal 5
    • Steering column tilt actuator terminal 7
    • Steering column tilt actuator terminal 8
    • If the test lamp illuminates, test the control circuit for a short to voltage.
  3. Test for infinite resistance between the control circuits listed below and ground:
    • Driver seat lumbar vertical motor terminal 1
    • Driver seat lumbar vertical motor terminal 2
    • Passenger seat lumbar vertical motor terminal 4
    • Passenger seat lumbar vertical motor terminal 5
    • Steering column tilt actuator terminal 7
    • Steering column tilt actuator terminal 8
    • If not the specified value, test the control circuit for a short to ground.
  4. Ignition OFF, disconnect the X1 harness connector at the MSM.
  5. Ignition ON, verify that a test lamp does not illuminate between control circuits listed below and ground:
    • Steering column telescope actuator terminal 8
    • Steering column telescope actuator terminal 7
    • If the test lamp illuminates, test the control circuit for a short to voltage.
  6. Test for infinite resistance between the control circuits listed below and ground:
    • Steering column telescope actuator terminal 8
    • Steering column telescope actuator terminal 7
    • If less than infinite, test the control circuit for a short to ground.
  7. If all circuits test normal, replace the MSM.
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