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 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) No. 4, No. 12, and No.16 terminals and tilt motor/position sensor 8P connector No. 6, No. 7, and No. 8 terminals 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) No. 4 and No. 12 terminals 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 ON (II).
16. Measure the voltage between tilt motor/position sensor 8P connector No. 6 and No. 8 terminals and between No. 7 and No. 8 terminals.
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) No. 2 and No. 16 terminals and tilt motor/position sensor 8P connector No.5 and No. 8 terminals 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 No. 5 terminal 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 ON (II).
25. Measure the voltage between power tilt/telescopic control unit connector A (16P) No. 2 and No. 16 terminals.
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) No. 7 and No. 8 terminals and tilt motor/position sensor 8P connector No. 2 and No. 3 terminals 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 No. 2 and No. 3 terminals individually.
Is there continuity?
YES - Repair short to ground in the wire.
NO - Go to step 31.
31. Test the tilt motor.
Is the motor OK?
YES - Replace the power tilt/telescopic control unit.
NO - Replace the tilt motor/position sensor.