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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 >> Circuit/System Testing

Circuit/System Testing

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.

B3920 Group 1 Motors

  1. Ignition OFF, disconnect the (C1) harness connector at the memory seat module.
  2. Ignition ON, verify that a test does not illuminate between any of the following motor control circuits 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 circuits 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 for front vertical motor terminal 12 and terminal 13
    • 1 ohm for rear vertical motor terminal 15 and terminal 16
    • 1 ohms for seat horizontal motor terminal 9 and terminal 10
    • If less than the specified resistance, test the control circuits for a short together or shorted motor.
  5. Ignition OFF, disconnect the (C4) harness connector at the memory seat module.
  6. Ignition ON, verify that a test does not illuminate between any of the following motor control circuits 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 circuits 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:
    • 10 ohms for lumbar horizontal motor terminal 12 and terminal 13
    • 1 ohm for recline motor terminal 15 and terminal 16
    • If less than the specified resistance, test the control circuits for a short together or shorted motor.
  9. If all circuits test normal, replace the memory seat module.
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