DTC B1840: Tilt Motor Pulse Error Acura RL II facelift

Note. If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).

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1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0), and then back to ON (II).
3. Operate the tilt switch in each direction for at least 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 power tilt motor/position sensor connector and at the power tilt/telescopic steering control unit connector.
5. Check for 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 to 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 steering control unit connector A (16P).
11. Disconnect the power tilt motor/position sensor 6P connector.
12. Check for continuity between power tilt/telescopic steering control unit connector A (16P) terminals No. 4, No. 12, and No. 16 and power 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 open in the wire.
13. Check for continuity between body ground and power tilt/telescopic steering 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 steering control unit connector A (16P).
15. Turn the ignition switch to ON (II).
16. Measure the voltage between the power tilt motor/ position power sensor 6P connector terminals No. 4 and No. 6 and between terminals No. 5 and No. 6. Is there about 5 V? YES -Replace the steering column assembly (see «STEERING COLUMN REMOVAL AND INSTALLATION»(ref-348511-S08332992362009112400000) ). NO -If there is no voltage, replace the power tilt/ telescopic steering 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 steering control unit connector A (16P).
19. Disconnect the power tilt motor/position sensor 6P connector.
20. Check for continuity between power tilt/telescopic steering control unit connector A (16P) terminals No. 2 and No. 16 and power tilt motor/position sensor 6P connector terminals No. 3 and No. 6 respectively. Is there continuity? YES -Go to step 21. NO -Repair open in the wire.
21. Disconnect the power telescopic motor/position sensor 8P connector.
22. Check for continuity between the power tilt motor/ position sensor 6P connector terminal No. 3 and body ground. Is there continuity? YES -Repair short to ground in the wire. NO -Go to step 23.
23. Reconnect power tilt/telescopic steering control unit connector A (16P).
24. Turn the ignition switch to ON (II).
25. Measure the voltage between power tilt/telescopic steering control unit connector A (16P) terminals No. 2 and No. 16. Is there battery voltage when the tilt switch is operated? YES -Replace the steering column assembly (see «STEERING COLUMN REMOVAL AND INSTALLATION»(ref-348511-S08332992362009112400000) ). NO -Replace the power tilt/telescopic steering control unit.
26. Turn the ignition switch to LOCK (0).
27. Disconnect power tilt/telescopic steering control unit connector B (8P).
28. Disconnect the power tilt motor/position sensor 6P connector.
29. Check for continuity between power tilt/telescopic steering control unit connector B (8P) terminals No. 7 and No. 8 and power tilt motor/position sensor 6P connector terminals No. 1 and No. 2 respectively. Is there continuity? YES -Go to step 30. NO -Repair open in the wire.
30. Check for continuity between body ground and power tilt motor/position sensor 6P connector terminals No. 1 and No. 2 individually. Is there continuity? YES -Repair short to ground in the wire. NO -Go to step 31.
31. Do the tilt motor test (see «POWER TILT/TELESCOPIC STEERING SWITCH TEST/REPLACEMENT»(ref-348587-S27920293092009112400000) ). Is the motor OK? YES -Replace the power tilt/telescopic steering control unit. NO -Replace the steering column assembly (see «STEERING COLUMN REMOVAL AND INSTALLATION»(ref-348511-S08332992362009112400000) ).