B2657

SEAT: REAR POWER SEAT CONTROL SYSTEM: B2657: Ottoman Sensor Malfunction
B2657 - Ottoman Sensor Malfunction

DESCRIPTION

When the position control ECU does not receive a sensor signal despite forward or backward movement of the seat by power seat motor operation, this DTC is output.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. PERFORM ACTIVE TEST USING TECHSTREAM (POWER SEAT MOTOR FUNCTION)

(a) Select the Active Test, use the Techstream to generate a control command, and then check the power seat motor function.

Rear Right Seat





OK:

Motor operates normally.

NG -- INSPECT REAR NO. 1 SEAT ADJUSTER ASSEMBLY (POWER SEAT MOTOR)
OK -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU RH - REAR POWER SEAT MOTOR AND BODY GROUND)

(a) Disconnect the f39 ECU connector.





(b) Disconnect the f16 motor connector.

(c) Measure the resistance according to the values in the table below.

Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

3. CHECK REAR NO. 1 SEAT ADJUSTER ASSEMBLY (POSITION CONTROL SENSOR)

(a) Disconnect the f16 motor connector.





(b) Measure the voltage according to the values in the table below.

Standard voltage:





NG -- REPLACE POSITION CONTROL ECU RH Disassembly
OK -- Continue to next step.

4. CHECK REAR NO. 1 SEAT ADJUSTER ASSEMBLY (POSITION CONTROL SENSOR)

(a) Reconnect the f16 motor connector.





(b) Measure the voltage according to the value in the table below.

Standard voltage:





NG -- REPLACE REAR NO. 1 SEAT ADJUSTER ASSEMBLY Disassembly
OK -- Continue to next step.

5. CHECK FOR DTC

(a) Clear the DTC Rear Power Seat Control System.

(b) Recheck for DTC.

OK:

DTC B2657 is not output.

NG -- REPLACE POSITION CONTROL ECU RH Disassembly

OK -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting

6. INSPECT REAR NO. 1 SEAT ADJUSTER ASSEMBLY (POWER SEAT MOTOR)

(a) Check operation of the power seat motor (ottoman motor).





(1) Check if the seat adjuster moves smoothly when the battery is connected to the ottoman motor connector terminals.

OK:





NG -- REPLACE REAR NO. 1 SEAT ADJUSTER ASSEMBLY Disassembly
OK -- Continue to next step.

7. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU RH - REAR POWER SEAT MOTOR)

(a) Disconnect the f4 ECU connector.





(b) Disconnect the f16 motor connector.

(c) Measure the resistance according to the value in the table below.

Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE POSITION CONTROL ECU RH Disassembly