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Home >> Acura >> 2006 >> RL >> Repair and Diagnosis >> Accessories & Equipment >> Memory Modules >> Driver Position Memory System (DPMS) >> DTC Troubleshooting >> DTC B1840: Tilt Motor Pulse Error
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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 (see TROUBLESHOOTING - 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 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 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.
    Fig 1: Checking Continuity Between Terminals No. 4, 12, 16 And Terminals No. 4, 5, 6
    G05497286Courtesy of AMERICAN HONDA MOTOR CO., INC.

    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.
    Fig 2: Checking Continuity Between Body Ground And Power Tilt/Telescopic Control Unit Connector A (16P) Terminals No. 4 And No. 12
    G05497287Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  - Repair a 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 6P connector terminals No. 4 and No. 6 and between terminals No. 5 and No. 6.
    Fig 3: Measuring Voltage Between Tilt Motor/Position Sensor 6P Connector Terminals No. 4, 6 And Terminals No. 5, 6
    G05497288Courtesy of AMERICAN HONDA MOTOR CO., INC.

    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.
    Fig 4: Checking Continuity Between Terminals No. 2, 16 And Terminals No. 3, 6
    G05497289Courtesy of AMERICAN HONDA MOTOR CO., INC.

    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.
    Fig 5: Checking Continuity Between Tilt Motor/Position Sensor 6P Connector Terminal No. 3 And Body Ground
    G05497290Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  - Repair a 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) terminals No. 2 and No. 16.
    Fig 6: Measuring Voltage Between Power Tilt/Telescopic Control Unit Connector A (16P) Terminals No. 2 And No. 16
    G05497291Courtesy of AMERICAN HONDA MOTOR CO., INC.

    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.
    Fig 7: Checking Continuity Between Terminals No. 7, 8 And Terminals No. 1, 2
    G05497292Courtesy of AMERICAN HONDA MOTOR CO., INC.

    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.
    Fig 8: Checking Continuity Between Body Ground And Tilt Motor/Position Sensor 6P Connector Terminals No. 1 And No. 2
    G05497293Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  - Repair a short to ground in the wire.

    NO  - Go to step 31.

  31. Do the tilt motor test (see POWER TILT/TELESCOPIC STEERING MOTOR TEST  ).

    Is the motor OK? 

    YES  - Replace the power tilt/telescopic control unit.

    NO  - Replace the tilt motor/position sensor.

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