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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 206 (Power Seat System) >> Diagnostic Information and Procedures >> DTC B3920 or B3921 >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition OFF, disconnect the X1 harness connector at the MSM.
  2. Ignition ON, verify that a test lamp does not illuminate 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 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 the control circuits listed below and ground:
    • Lumbar vertical motor terminal 1
    • Lumbar vertical motor terminal 2
    • Lumbar horizontal motor terminal 12
    • Lumbar horizontal motor terminal 13
    • Seat recline motor terminal 15
    • Seat recline motor terminal 16
    • Adjustable pedal actuator terminal 9
    • Adjustable pedal actuator terminal 10
    • 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 vertical motor terminal 1
    • Lumbar vertical motor terminal 2
    • Lumbar horizontal motor terminal 12
    • Lumbar horizontal motor terminal 13
    • Seat recline motor terminal 15
    • Seat recline motor terminal 16
    • Adjustable pedal actuator terminal 9
    • Adjustable pedal actuator terminal 10
    • If not the specified value, test the control circuit for a short to ground.
  7. If all circuits test normal, replace the MSM.
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