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Home >> Isuzu >> 2007 >> i-290 LS, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 41 (Power Seat System) >> Diagnostic Information and Procedures >> DTC B3920 or B3921 >> B3921 Group 2 Motors

B3921 Group 2 Motors

WARNING: This page is about a different car, the 2007 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the (C4) harness connector at the memory seat module.
  2. Ignition ON, verify that a test lamp does not illuminate between any of the following motor control circuits 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 ohms of resistance between the following motor control circuits 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 less than infinite, test the control circuit for a short to ground.
  4. Test for greater resistance values than specified between the following motor control circuits:
    • 10 ohms for driver seat lumbar vertical motor terminal 1 and terminal 2
    • 10 ohm for passenger seat lumbar vertical motor terminal 4 and terminal 5
    • 1 ohm for steering column tilt actuator terminal 7 and terminal 8
    • If less than the specified resistance, test the control circuits for a short together or shorted motor.
  5. Ignition OFF, disconnect the (C1) harness connector at the memory seat module.
  6. Ignition ON, verify that a test lamp does not illuminate between any of the following actuator control circuits 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.
  7. Test for infinite ohms of resistance between the following actuator control circuits 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.
  8. Test for greater than 1 ohm of resistance between the steering column telescope actuator control circuits terminal 7 and terminal 8.
    • If less than 1 ohm, test the control circuits for a short together or shorted actuator.
  9. If all circuits test normal, replace the memory seat module.
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