DTC B1825: Power Seat Slide 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 ).
DTC B1825 is, even when the system is OK, stored if the slide switch is operated for more than one second after the seat reaches its forward or rear limit.

Turn the ignition switch to LOCK (0), and then back to ON (II).
Clear the DTCs with the HDS.
Operate the power seat adjustment switch in all directions for more than 2 seconds.
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 - Go to DTC B1836 .

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

YES - Go to step 16.

NO - Go to step 7.
Operate the slide switch for 2 seconds and check the slide motor operation.
Does the slide motor run smoothly?

YES - Go to step 8.

NO - Go to step 24.
Turn the ignition switch to LOCK (0).
Disconnect power seat control unit connector A (40P).
Disconnect the slide position sensor 3P connector.
Check for continuity between power seat control unit connector A (40P) No. 11 and No. 29 terminals and slide position sensor 3P connector No. 1 and No. 2 terminals.

Fig 1: Identifying Continuity Between No. 11 And No. 29 Terminals And No. 1 And No. 2 Terminals
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Go to step 12.

NO - Repair open in the wire.
Check for continuity between power seat control unit connector A (40P) No. 11 terminal and body ground.

Fig 2: Identifying Continuity Between Power Seat Control Unit Connector A (40P) No. 11 Terminal 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 13.
Reconnect power seat control unit connector A (40P).
Turn the ignition switch to ON (II).
Measure the voltage between the slide position sensor 3P connector No. 3 and No. 2 terminals.

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

Is there about 10 V?

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

NO - Check for an open in the WHT/BLK wire. If it is OK, substitute a known-good power seat control unit. If the problem is repaired, replace the power seat control unit.
Turn the ignition switch to LOCK (0).
Disconnect power seat control unit connector A (40P).
Disconnect the slide position sensor 3P connector.
Check for continuity between power seat control unit connector A (40P) No. 15 and No. 29 terminals and slide position sensor 3P connector No. 3 and No. 2 terminals.

Fig 4: Identifying Continuity Between No. 15 And No. 29 Terminals And No. 3 And No. 2 Terminals
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Go to step 20.

NO - Repair open in the wire.
Disconnect each 5P connector from the recline motor/position sensor, rear up-down motor/ position sensor and the front up-down motor/ position sensor.
Check for continuity between the slide position sensor 3P connector terminal No. 3 and body ground.

Fig 5: Identifying Continuity Between Slide Position Sensor 3P 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 22.
Reconnect power seat control unit connector A (40P).
Measure the voltage 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 about 10 V when the slide switch is operated?

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

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 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.

Fig 7: Identifying Continuity Between No. 7, 17 Terminals And No. 1, 2 Terminals
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Go to step 28.

NO - Repair open in the wire.
Check for continuity between the slide motor 2P connector No. 1 and No. 2 terminals and body ground.

Fig 8: Identifying Continuity Between Slide Motor 2P Connector No. 1, 2 Terminals 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 29.
Perform the slide motor test (see DRIVER'S POWER SEAT MOTOR TEST ).
Is the motor OK?

YES - Replace the power seat control unit.

NO - Replace the slide motor.