Circuit/System Testing

B1340 0B

1. Ignition ON, use a scan tool to clear the current and history diagnostic trouble code.
2. Determine which motor set this DTC by operating the motors listed below one at a time in both directions. Check for the DTC to set between each motor test.
   • Driver seat lumbar vertical motor
   • Passenger seat lumbar vertical motor
   • Steering column tilt actuator
   • Steering column telescope actuator
3. Clear the diagnostic trouble codes.
4. Ignition OFF, disconnect the harness connector at the appropriate lumbar motor or steering column motor for which the DTC set.
5. Ignition ON, operate the motor adjuster switch in both directions. DTC B1340 0B should not set.
   • If the DTC sets, test for a short between the appropriate motor control circuits listed below. If the circuits test normal, replace the MSM.
   • Driver seat lumbar vertical motor terminal A and terminal B
   • Passenger seat lumbar vertical motor terminal A X354 and terminal B X354
   • Steering column tilt actuator terminal A X1 and terminal B X1
   • Steering column telescope actuator terminal A X1 and terminal B X1
   • If greater than the specified value, test the control circuit for a short to voltage.
6. Test the appropriate control circuits listed below for a high resistance.
   • Driver seat lumbar vertical motor terminal A and terminal B
   • Passenger seat lumbar vertical motor terminal A X354 and terminal B X354
   • Steering column tilt actuator terminal A X1 and terminal B X1
   • Steering column telescope actuator terminal A X1 and terminal B X1
7. If the circuits test normal, test or replace the appropriate lumbar motor or steering column motor.

B1340 42 or B1340 4B 

If either DTC is set history or current, replace the MSM.