B1840
DTC B1840: Tilt Motor Pulse ErrorNOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A.
1. Clear the DTCs with the HDS.
2. Turn the ignition switch OFF, 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 tilt position sensor is OK at this time. Check for loose or poor connections at the tilt motor/position sensor connector and at the power tilt/telescopic control unit connector.
5. Check for DTCs with the HDS.
Is DTCs 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 OFF, 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 OFF.
10. Disconnect power tilt/telescopic control unit connector A (16P).
11. Disconnect the tilt motor/position sensor 6P 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 6P connector terminals No. 4, No. 5, and No. 6 respectively.
Is there continuity?
YES - Go to step 13.
NO - Repair an 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 a short in the wire.
NO - Go to step 14.
14. Reconnect power tilt/telescopic control unit connector A (16P).
15. Turn the ignition switch ON (II).
16. Measure voltage between tilt motor/position sensor 6P connector terminals No. 4 and No. 6 and between terminals No. 5 and No. 6.
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 a short in the wire.
17. Turn the ignition switch OFF.
18. Disconnect power tilt/telescopic control unit connector A (16P).
19. Disconnect the tilt motor/position sensor 6P 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 6P connector terminals No. 3 and No. 6 respectively.
Is there continuity?
YES - Go to step 21.
NO - Repair an open in the wire.
21. Disconnect the telescopic motor/position sensor 8P connector.
22. Check for continuity between tilt motor/position sensor 6P connector terminal No. 3 and body ground.
Is there continuity?
YES - Repair a short in the wire.
NO - Go to step 23.
23. Reconnect power tilt/telescopic control unit connector A (16P).
24. Turn the ignition switch ON (II).
25. Measure 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 OFF.
27. Disconnect power tilt/telescopic control unit connector B (8P).
28. Disconnect the tilt motor/position sensor 6P 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 6P connector terminals No. 1 and No. 2 respectively.
Is there continuity?
YES - Go to step 30.
NO - Repair an open in the wire.
30. Check for continuity between body ground and tilt motor/position sensor 6P connector terminals No. 1 and No. 2 individually.
Is there continuity?
YES - Repair a short in the wire.
NO - Go to step 31.
31. Do the tilt motor test.
Is the motor OK?
YES - Replace the power tilt/telescopic control unit.
NO - Replace the tilt motor/position sensor.