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 ).

Clear the DTCs with the HDS.
Turn the ignition switch to LOCK (0), and then back to ON (II).
Operate the power seat adjustment switch in all directions for more than 1 second each.
NOTE: DTC B1825 is stored when the slide switch is operated more than 1 second after the seat moves to the most forward or most backward position, even when the system is OK.
Check for DTCs with the HDS.
Is DTC B1825 indicated?

YES - Go to step 5.

NO - Intermittent failure, the slide motor/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 the DTC B1836 troubleshooting.

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 to 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 B (40P).
Disconnect the slide motor/position sensor 6P connector.
Check for continuity between power seat control unit connector B (40P) terminals No. 11 and No. 29 and slide motor/position sensor 6P connector terminals No. 1 and No. 3 respectively.
Is there continuity?

YES - Go to step 13.

NO - Repair an open or high resistance in the wire. ■

Fig 1: Checking Continuity Between Power Seat Control Unit Connector B (40P) Terminals No. 11 & No. 29
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Check for continuity between body ground and power seat control unit connector B (40P) terminal No. 11.
Is there continuity?

YES - Repair a short to ground in the wire. ■

NO - Go to step 14.

Fig 2: Checking Continuity Between Body Ground & Power Seat Control Unit Connector B (40P) Terminal No. 11
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Reconnect power seat control unit connector B (40P).
Turn the ignition switch to ON (II).
Measure the voltage between slide motor/position sensor 6P connector terminals No. 1 (+) and No. 3 (-).
Is there about 5 V?

YES - Faulty slide motor/position sensor, replace it. ■

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). ■

Fig 3: Measuring Voltage Between Slide Motor/Position Sensor 6P Connector Terminals No. 1 & 3
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Turn the ignition switch to LOCK (0).
Disconnect power seat control unit connector B (40P).
Disconnect the slide motor/position sensor 6P connector.
Check for continuity between power seat control unit connector B (40P) terminals No. 15 and No. 29 and slide motor/position sensor 6P connector terminals No. 4 and No. 3 respectively.
Is there continuity?

YES - Go to step 21.

NO - Repair an open or high resistance in the wire. ■

Fig 4: Checking Continuity Between Power Seat Control Unit Connector B (40P) Terminals No. 15 & No. 29
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Disconnect the 6P connector from the front up-down motor/position sensor and the rear up-down motor/position sensor, then disconnect the recline motor/position sensor 8P connector.
Check for continuity between body ground and slide motor/position sensor 6P connector terminal No. 4.
Is there continuity?

YES - Repair a short to ground in the wire. ■

NO - Go to Step 23.

Fig 5: Checking Continuity Between Body Ground & Slide Motor/Position Sensor 6P Connector Terminal No. 4
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Reconnect power seat control unit connector B (40P).
Turn the ignition switch to ON (II).
Measure the voltage between power seat control unit connector B (40P) terminals No. 15 and No. 29.
Is there battery voltage when the slide switch is operated?

YES - Replace the slide motor/position sensor (see FRONT SEAT SLIDE MOTOR REPLACEMENT ). ■

NO - Replace the power seat control unit (see Power Seat Control Unit Input Test/Replacement ). ■

Fig 6: Measuring Voltage Between Power Seat Control Unit Connector B (40P) Terminals No. 15 & No. 29
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Check the No. 10 (20A) fuse in the auxiliary under-hood fuse box.
Is the fuse OK?

YES - Go to step 28.

NO - Replace the fuse and recheck for proper operation. ■
Measure the voltage to body ground at power seat control unit connector A (18P) terminals No. 4 and No. 18 when operating the slide switch.
Is there 0.2 V or more?

YES - Repair an open or high resistance in the wire between the power seat control unit and G503..

NO - Go to step 28.
Turn the ignition switch to LOCK (0).
Disconnect power seat control unit connector A (18P).
Disconnect the slide motor/position sensor 6P connector.
Check for continuity between power seat control unit connector A (18P) terminals No. 7 and No. 17 and slide motor/position sensor 6P connector terminals No. 5 and No. 6 respectively.
Is there continuity?

YES - Go to step 31.

NO - Repair an open or high resistance in the wire. ■

Fig 7: Checking Continuity Between Power Seat Control Unit Connector A (18P) Terminals No. 7 & No. 17
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Check for continuity between body ground and slide motor/position sensor 6P connector terminals No. 5 and No. 6 individually.
Is there continuity?

YES - Repair a short to ground in the wire. ■

NO - Go to step 32.

Fig 8: Checking Continuity Between Body Ground & Slide Motor/Position Sensor 6P Connector Terminals 5 & 6
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Test the slide motor (see DRIVER'S POWER SEAT MOTOR TEST ).
Is the motor OK?

YES - Replace the power seat control unit. ■

NO - Replace the slide motor/position sensor. ■