Circuit/System Testing

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 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 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 the control circuits listed below and ground:
   • Lumbar vertical motor terminal 1
   • Lumbar vertical motor terminal 2
   • Steering column tilt motor terminal 8
   • Steering column tilt motor terminal 7
   • 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:
   • Lumbar vertical motor terminal 1
   • Lumbar vertical motor terminal 2
   • Steering column tilt motor terminal 8
   • Steering column tilt motor terminal 7
   • If not the specified value, test the control circuit for a short to ground.
4. If all circuits test normal, replace the MSM.