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Home >> Lexus >> 2008 >> LS 460 V8-4.6L (1UR-FSE) >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> B Code Charts >> B2654 >> Front Power Seat Control System

Front Power Seat Control System








SEAT: FRONT POWER SEAT CONTROL SYSTEM: B2654: Headrest Sensor Malfunction

DTC B2654 - Headrest Sensor Malfunction

DESCRIPTION

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






WIRING DIAGRAM













INSPECTION PROCEDURE

PROCEDURE

1. CHECK FOR DTC
(a) DTC output area check
(1) Using the Techstream, determine the area that output the DTC.
Result:






B -- CHECK VEHICLE
A -- Continue to next step.
2. 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.

Driver Seat





OK:
Motor operates normally
NG -- CHECK FRONT SEAT HEADREST ADJUSTER SUB-ASSEMBLY (POWER SEAT MOTOR)
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH LH - FRONT HEADREST MOTOR LH AND BODY GROUND)





(a) Disconnect the e46 switch connector.
(b) Disconnect the e53 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.
4. CHECK FRONT SEAT HEADREST ADJUSTER SUB-ASSEMBLY (POSITION CONTROL SENSOR)





(a) Disconnect the e53 motor connector.
(b) Measure the voltage according to the values in the table below.
Standard voltage:






NG -- REPLACE FRONT POWER SEAT SWITCH LH
OK -- Continue to next step.
5. CHECK FRONT SEAT HEADREST ADJUSTER SUB-ASSEMBLY (POSITION CONTROL SENSOR)





(a) Reconnect the e53 motor connector.
(b) Measure the voltage according to the value in the table below.
Standard voltage:






NG -- REPLACE FRONT SEAT HEADREST ADJUSTER SUB-ASSEMBLY
OK -- Continue to next step.
6. CHECK FOR DTC
(a) Clear the DTC Front Power Seat Control System.
(b) Recheck the DTC.
OK:
DTC B2654 is not output.
NG -- REPLACE FRONT POWER SEAT SWITCH LH
OK -- END (SYSTEM RETURNS TO NORMAL)
7. CHECK FRONT SEAT HEADREST ADJUSTER SUB-ASSEMBLY (POWER SEAT MOTOR)





(a) Check operation of the power seat motor (headrest motor).
(1) Check if the seat adjuster moves smoothly when the battery is connected to the headrest motor connector terminals.
OK:






NG -- REPLACE FRONT SEAT HEADREST ADJUSTER SUB-ASSEMBLY
OK -- Continue to next step.
8. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH LH - FRONT HEADREST MOTOR LH)
(a) Disconnect the e45 switch connector.





(b) Disconnect the e53 motor connector.
(c) Measure the resistance according to the values in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE FRONT POWER SEAT SWITCH LH
9. CHECK VEHICLE
(a) Check the type of headrest.






B -- PERFORM ACTIVE TEST USING TECHSTREAM (POWER SEAT MOTOR FUNCTION)
A -- Continue to next step.
10. 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.

Passenger Seat





OK:
Motor operates normally
NG -- CHECK POWER SEAT MOTOR ASSEMBLY
OK -- Continue to next step.
11. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH RH - FRONT HEADREST POSITION SENSOR RH AND BODY GROUND)





(a) Disconnect the e20 switch connector.
(b) Disconnect the e23 sensor 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.
12. CHECK FRONT SEAT HEADREST ADJUSTER (POSITION CONTROL SENSOR)





(a) Disconnect the e23 sensor connector.
(b) Measure the voltage according to the values in the table below.
Standard voltage:






NG -- REPLACE FRONT POWER SEAT SWITCH RH
OK -- Continue to next step.
13. CHECK FRONT SEAT HEADREST ADJUSTER (POSITION CONTROL SENSOR)





(a) Reconnect the e23 sensor connector.
(b) Measure the voltage according to the value in the table below.
Standard voltage:






NG -- REPLACE FRONT SEAT HEADREST ADJUSTER
OK -- Continue to next step.
14. CHECK FOR DTC
(a) Clear the DTC Front Power Seat Control System.
(b) Recheck the DTC.
OK:
DTC B2654 is not output.
NG -- REPLACE FRONT POWER SEAT SWITCH RH
OK -- END (SYSTEM RETURNS TO NORMAL)
15. CHECK POWER SEAT MOTOR ASSEMBLY





(a) Check operation of the power seat motor (headrest motor).
(1) Check if the seat adjuster moves smoothly when the battery is connected to the headrest motor connector terminals.
OK:






NG -- REPLACE POWER SEAT MOTOR ASSEMBLY
OK -- Continue to next step.
16. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH RH - POWER SEAT MOTOR)
(a) Disconnect the e18 switch connector.





(b) Disconnect the e26 motor connector.
(c) Measure the resistance according to the values in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE FRONT POWER SEAT SWITCH RH
17. 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.

Passenger Seat





OK:
Motor operates normally
NG -- CHECK FRONT SEAT HEADREST ADJUSTER SUB-ASSEMBLY (POWER SEAT MOTOR)
OK -- Continue to next step.
18. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH RH - FRONT HEADREST MOTOR RH AND BODY GROUND)





(a) Disconnect the e20 switch connector.
(b) Disconnect the e25 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.
19. CHECK FRONT SEAT HEADREST ADJUSTER SUB-ASSEMBLY (POSITION CONTROL SENSOR)





(a) Disconnect the e25 sensor connector.
(b) Measure the voltage according to the values in the table below.
Standard voltage:






NG -- REPLACE FRONT POWER SEAT SWITCH RH
OK -- Continue to next step.
20. CHECK FRONT SEAT HEADREST ADJUSTER SUB-ASSEMBLY (POSITION CONTROL SENSOR)





(a) Reconnect the e25 sensor connector.
(b) Measure the voltage according to the value in the table below.
Standard voltage:






NG -- REPLACE FRONT SEAT HEADREST ADJUSTER SUB-ASSEMBLY
OK -- Continue to next step.
21. CHECK FOR DTC
(a) Clear the DTC Front Power Seat Control System.
(b) Recheck the DTC.
OK:
DTC B2654 is not output.
NG -- REPLACE FRONT POWER SEAT SWITCH RH
OK -- END (SYSTEM RETURNS TO NORMAL)
22. CHECK FRONT SEAT HEADREST ADJUSTER SUB-ASSEMBLY (POWER SEAT MOTOR)





(a) Check operation of the power seat motor (headrest motor).
(1) Check if the seat adjuster moves smoothly when the battery is connected to the headrest motor connector terminals.
OK:






NG -- REPLACE FRONT SEAT HEADREST ADJUSTER SUB-ASSEMBLY
OK -- Continue to next step.
23. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH RH - FRONT HEADREST MOTOR RH)
(a) Disconnect the e18 switch connector.





(b) Disconnect the e25 motor connector.
(c) Measure the resistance according to the values in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE FRONT POWER SEAT SWITCH RH
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