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 ).

Clear the DTCs with the HDS.
Turn the ignition switch to LOCK (0), and then back to ON (II).
Operate the tilt switch in each direction for at least 1 second.
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.
Check for DTCs with the HDS.
Is DTC B1841 also indicated?

YES -Go to step 17.

NO -Go to step 6.
Clear the DTCs with the HDS.
Turn the ignition switch to LOCK (0), and then back to ON (II).
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.
Turn the ignition switch to LOCK (0).
Disconnect power tilt/telescopic steering control unit connector A (16P).
Disconnect the power tilt motor/position sensor 6P connector.
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.

Fig 1: Checking Continuity Between Power Tilt/Telescopic Steering Control Unit Connector A (16P) Terminals No. 4 And No. 16
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Go to step 13.

NO -Repair open in the wire.
Check for continuity between body ground and power tilt/telescopic steering control unit connector A (16P) terminals No. 4 and No. 12 individually.

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

Is there continuity?

YES -Repair short to ground in the wire.

NO -Go to step 14.
Reconnect power tilt/telescopic steering control unit connector A (16P).
Turn the ignition switch to ON (II).
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.

Fig 3: Measuring Voltage Between Power Tilt Motor/ Position Power Sensor 6P Connector Terminals No. 4 And No. 6
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there about 5 V?

YES -Replace the steering column assembly (see STEERING COLUMN REMOVAL AND INSTALLATION ).

NO -If there is no voltage, replace the power tilt/ telescopic steering control unit. If there is battery voltage, repair short in the wire.
Turn the ignition switch to LOCK (0).
Disconnect power tilt/telescopic steering control unit connector A (16P).
Disconnect the power tilt motor/position sensor 6P connector.
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.

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

Is there continuity?

YES -Go to step 21.

NO -Repair open in the wire.
Disconnect the power telescopic motor/position sensor 8P connector.
Check for continuity between the power tilt motor/ position sensor 6P connector terminal No. 3 and body ground.

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

Is there continuity?

YES -Repair short to ground in the wire.

NO -Go to step 23.
Reconnect power tilt/telescopic steering control unit connector A (16P).
Turn the ignition switch to ON (II).
Measure the voltage between power tilt/telescopic steering control unit connector A (16P) terminals No. 2 and No. 16.

Fig 6: Measuring Voltage Between Power Tilt/Telescopic Steering Control Unit Connector A (16P) Terminals No. 2 And No. 16
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage when the tilt switch is operated?

YES -Replace the steering column assembly (see STEERING COLUMN REMOVAL AND INSTALLATION ).

NO -Replace the power tilt/telescopic steering control unit.
Turn the ignition switch to LOCK (0).
Disconnect power tilt/telescopic steering control unit connector B (8P).
Disconnect the power tilt motor/position sensor 6P connector.
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.

Fig 7: Checking Continuity Between Power Tilt/Telescopic Steering Control Unit Connector B (8P) Terminals No. 7 And No. 8
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Go to step 30.

NO -Repair open in the wire.
Check for continuity between body ground and power tilt motor/position sensor 6P connector terminals No. 1 and No. 2 individually.

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

Is there continuity?

YES -Repair short to ground in the wire.

NO -Go to step 31.
Do the tilt motor test (see POWER TILT/TELESCOPIC STEERING SWITCH TEST/REPLACEMENT ).
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 ).