Circuit/System Testing

B3920 01 or B3920 02

1. Ignition OFF, disconnect the X4 and X5 harness connectors at the K40 Seat Memory Control Module.
2. Test for infinite resistance between the control circuit terminals listed below and ground:
   • M50D front vertical motor up control terminal 7 X4
   • M50D front vertical motor down control terminal 8 X4
   • M55D rear vertical motor up control terminal 4 X5
   • M55D rear vertical motor down control terminal 3 X5
   • M51D horizontal motor forward control terminal 2 X5
   • M51D horizontal motor rearward control terminal 1 X5
   • If less than infinite resistance 

     Repair the short to ground on the circuit.

   • If infinite resistance 
3. Ignition ON.
4. Test for less than 1 V between the control circuit terminals listed below and ground:
   • M50D front vertical motor up control terminal 7 X4
   • M50D front vertical motor down control terminal 8 X4
   • M55D rear vertical motor up control terminal 4 X5
   • M55D rear vertical motor down control terminal 3 X5
   • M51D horizontal motor forward control terminal 2 X5
   • M51D horizontal motor rearward control terminal 1 X5
   • If 1 V or greater 

     Repair the short to voltage on the circuit.

   • If less than 1 V 
5. Replace the K40 Seat Memory Control Module.

B3920 00 or B3920 0B

1. Ignition ON.
2. Clear the current and history DTC.
3. Determine which motor set this DTC by operating the driver seat motors listed below one at a time in both directions. Check for the DTC to set between each motor test.
   • M50D Seat Front Vertical Motor
   • M55D Seat Rear Vertical Motor
   • M51D Seat Horizontal Motor
4. Ignition OFF, disconnect the harness connector at the seat motor for which the DTC set, ignition ON.
5. Clear the DTC.
6. Verify that DTC B3920 00 or B3920 0B does not set while operating the seat motor adjuster switch in both directions.
   • If DTC B3920 00 or B3920 0B sets 
   1. Test for infinite resistance between control circuit terminal 1 and control circuit terminal 5.
      • If less than infinite resistance, repair the short between the circuits.
      • If infinite resistance
   2. Test for less than 2 Ω between the control circuit terminals listed below end to end:
      • Terminal 1
      • Terminal 5
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the seat motor.
   • If DTC B3920 00 or B3920 0B does not set 
7. Replace the seat motor.

B3920 42

1. Ignition ON.
2. Verify the DTC is not set.
   • If the DTC is set 

     Replace the K40 Seat Memory Control Module.

   • If the DTC is not set 
3. All OK.