DTC B1825: Power Seat Slide Motor Pulse Error

WARNING: This page is about a different car, the 2009 Acura MDX, 2008 Acura MDX, and 2007 Acura MDX. However, it is still accessible from the selected car via links, so may be relevant.

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 ).

DTC B1825 is stored when the slide switch is operated more than 1 second after the seat slides to the most forward or most backward position even when the system is OK.

Turn the ignition switch to LOCK (0), and then back ON (II).
Clear the DTCs with the HDS.
Operate the power seat adjustment switch in all directions for more than 1 second each.
Check for DTCs with the HDS.
Is DTC B1825 indicated?

YES - Go to step 5.

NO - Intermittent failure, the slide position sensor is OK at this time. Check for loose or poor connections at the power seat control unit connector.
Check for DTCs with the HDS.
Is DTC B1836 also indicated?

YES - Troubleshoot DTC B1836 first.

NO - Go to step 6.
Check for DTCs with the HDS.
Are DTCs B1826, B1827 and/or B1828 also indicated?

YES - Go to step 17.

NO - Go to step 7.
Turn the ignition switch to LOCK (0), and then back ON (II).
Operate the slide switch for 2 seconds, and check the slide motor operation.
Does the slide motor run smoothly?

YES - Go to step 9.

NO - Go to step 26.
Turn the ignition switch to LOCK (0).
Disconnect power seat control unit connector A (40P).
Disconnect the slide position sensor 4P connector.
Check for continuity between the power seat control unit connector A (40P) No. 11 and No. 29 terminals and the slide position sensor 4P connector No. 2 and No. 3 terminals respectively.

Fig 1: Identifying Continuity Between No. 11 And No. 29 Terminals And No. 2 And No. 3 Terminals
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 the power seat control unit connector A (40P) No. 11 terminal.

Fig 2: Identifying Continuity Between Body Ground And Power Seat Control Unit Connector A (40P) No. 11 Terminal
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 seat control unit connector A (40P).
Turn the ignition switch ON (II).
Measure the voltage between the slide position sensor 4P connector No. 2 (+) and No. 3 (-) terminals.

Fig 3: Identifying Voltage Between Slide Position Sensor 4P Connector No. 2 And No. 3 Terminals
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there about 5 V?

YES - Faulty slide position sensor, replace the slide motor.

NO - If there is no voltage, replace the power seat control unit. If there is battery voltage, repair a short in the wire (sensor line).
Turn the ignition switch to LOCK (0).
Disconnect power seat control unit connector A (40P).
Disconnect the slide position sensor 4P connector.
Check for continuity between the power seat control unit connector A (40P) No. 15 and No. 29 terminals and the slide position sensor 4P connector No. 1 and No. 3 terminals respectively.

Fig 4: Identifying Continuity Between No. 15 And No. 29 Terminals And No. 1 And No. 3 Terminals
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Go to step 21.

NO - Repair open in the wire.
Disconnect the 4P connector from the front up-down position sensor and the rear up-down position sensor, then disconnect the recline motor/ lumbar support motor 8P connector.
Check for continuity between body ground and the slide position sensor 4P connector No. 1 terminal.

Fig 5: Identifying Continuity Between Body Ground And Slide Position Sensor 4P Connector No. 1 Terminal
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 seat control unit connector A (40P).
Turn the ignition switch ON (II).
Measure the voltage the between power seat control unit connector A (40P) No. 15 and No. 29 terminals.

Fig 6: Identifying Voltage Between Power Seat Control Unit Connector A (40P) No. 15 And No. 29 Terminals
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage when the slide switch is operated?

YES - Replace the slide motor/position sensor.

NO - Replace the power seat control unit.
Turn the ignition switch to LOCK (0).
Disconnect power seat control unit connector B (18P).
Disconnect the slide motor 2P connector.
Check for continuity between the power seat control unit connector B(18P) No. 7 and No. 17 terminals and the slide motor 2P connector No. 1 and No. 2 terminals respectively:

Fig 7: Identifying Continuity Between No. 7 And No. 17 Terminals And No. 1 And No. 2 Terminals
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 the slide motor 2P connector No. 1 and No. 2 terminals individually.

Fig 8: Identifying Continuity Between Body Ground And Slide Motor 2P Connector No. 1 And No. 2 Terminals
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Repair short to ground in the wire.

NO - Go to step 31.
Test the slide motor (see SLIDE MOTOR, FRONT UP-DOWN MOTOR, REAR UP-DOWN MOTOR ).
Is the motor OK?

YES - Replace the power seat control unit.

NO - Replace the slide motor/position sensor.