B1840

DTC Troubleshooting: B1840

DTC B1840: Tilt Motor Pulse Error

NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A. Troubleshooting - B-CAN System Diagnosis Test Mode A

1. Clear the DTCs with the HDS.

2. Turn the ignition switch to LOCK (0) and then back ON (II).

3. Operate the tilt switch in each direction for more than 1 second.

4. Check for DTCs with the HDS.

Is DTC B1840 indicated?
YES - Go to step 5.

NO - Intermittent failure, the system is OK at this time. Check for loose or poor connections.


5. Clear the DTCs with the HDS.

Is DTC B1841 also indicated?
YES - Go to step 17.

NO - Go to step 6.


6. Clear the DTCs with the HDS.

7. Turn the ignition switch to LOCK (0) and then back ON (II).

8. Operate the tilt switch for 2 seconds, and check the tilt motor operation.

Does the tilt motor run smoothly?
YES - Go to step 9.

NO - Go to step 26.


9. Turn the ignition switch to LOCK (0).

10. Disconnect power tilt/telescopic control unit connector A (16P).

11. Disconnect the tilt motor/position sensor 8P connector.

12. Check for continuity between power tilt/telescopic control unit connector A (16P) terminals No. 4, No. 12, and No. 16 and tilt motor/position sensor 8P connector terminals No. 6, No. 7, and No. 8 respectively.

Is there continuity?
YES - Go to step 13.

NO - Repair open in the wire.






13. Check for continuity between body ground and power tilt/telescopic control unit connector A (16P) terminals No. 4 and No. 12 individually.

Is there continuity?
YES - Repair short to ground in the wire.

NO - Go to step 14.






14. Reconnect power tilt/telescopic control unit connector A (16P).

15. Turn the ignition switch to ON (II).

16. Measure the voltage between tilt motor/position sensor 8P connector terminals No. 6 and No. 8 and between terminals No. 7 and No. 8.

Is there about 5 V?
YES - Faulty tilt motor/position sensor, replace the tilt motor assembly.

NO - If there is no voltage, replace the power tilt/telescopic control unit. If there is battery voltage, repair short in the wire.






17. Turn the ignition switch to LOCK (0).

18. Disconnect power tilt/telescopic control unit connector A (16P).

19. Disconnect the tilt motor/position sensor 8P connector.

20. Check for continuity between power tilt/telescopic control unit connector A (16P) terminals No. 2 and No. 16 and tilt motor/position sensor 8P connector terminals No. 5 and No. 8 respectively.

Is there continuity?
YES - Go to step 21.

NO - Repair open in the wire.






21. Disconnect the telescopic motor/position sensor 6P connector.

22. Check for continuity between tilt motor/position sensor 8P connector terminal No. 5 and body ground.

Is there continuity?
YES - Repair short to ground in the wire.

NO - Go to step 23.






23. Reconnect power tilt/telescopic control unit connector A (16P).

24. Turn the ignition switch to ON (II).

25. Measure the voltage between power tilt/telescopic control unit connector A (16P) terminals No. 2 and No. 16.

Is there battery voltage when the tilt switch is operated?
YES - Faulty tilt motor/position sensor, replace the tilt motor assembly.

NO - Replace the power tilt/telescopic control unit.






26. Turn the ignition switch to LOCK (0).

27. Disconnect power tilt/telescopic control unit connector B (8P).

28. Disconnect the tilt motor/position sensor 8P connector.

29. Check for continuity between power tilt/telescopic control unit connector B (8P) terminals No. 7 and No. 8 and tilt motor/position sensor 8P connector terminals No. 2 and No. 3 respectively.

Is there continuity?
YES - Go to step 30.

NO - Repair open in the wire.






30. Check for continuity between body ground and tilt motor/position sensor 8P connector terminals No. 2 and No. 3 individually.

Is there continuity?
YES - Repair short to ground in the wire.

NO - Go to step 31.






31. Test the tilt motor. Testing and Inspection

Is the motor OK?
YES - Replace the power tilt/telescopic control unit.

NO - Replace the tilt motor/position sensor.