B2652

SEAT: FRONT POWER SEAT CONTROL SYSTEM (w/ Memory): B2652: Front Vertical Sensor Malfunction
B2652 - Front Vertical Sensor Malfunction

DESCRIPTION

When the position control ECU and switch assembly does not receive a sensor signal despite upward or downward movement of the front of the seat cushion by power seat motor operation, this DTC is stored.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. PERFORM ACTIVE TEST USING TECHSTREAM (FRONT VERTICAL MOTOR)

(a) Turn the power switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the power switch on (IG).

(d) Turn the Techstream on.

(e) Enter the following menus: Body Electrical / Driver Seat / Active Test.

(f) Perform the Active Test according to the display on the Techstream.

Driver Seat (Position Control ECU and Switch Assembly)





OK:

Motor operates normally.

NG -- INSPECT FRONT VERTICAL MOTOR (SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY)
OK -- Continue to next step.

2. CHECK POSITION CONTROL ECU AND SWITCH ASSEMBLY (FRONT VERTICAL MOTOR CIRCUIT)

(a) Disconnect the X2 front vertical motor connector.

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

Standard Voltage:





NG -- CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU AND SWITCH - FRONT VERTICAL MOTOR)
OK -- Continue to next step.

3. CHECK FRONT VERTICAL MOTOR (SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY)

(a) Reconnect the X2 front vertical motor connector.





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

Standard Voltage:





Text in Illustration





NG -- REPLACE FRONT VERTICAL MOTOR (SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY) Removal

OK -- REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY Removal

4. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU AND SWITCH - FRONT VERTICAL MOTOR)

(a) Disconnect the X5 position control ECU and switch assembly connector.

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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY Removal

5. INSPECT FRONT VERTICAL MOTOR (SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY)

(a) Disconnect the X2 front vertical motor connector.





(b) Check if the seat cushion spring moves smoothly when the auxiliary battery is connected to the front vertical motor connector terminals.

OK:





Text in Illustration





NG -- REPLACE FRONT VERTICAL MOTOR (SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY) Removal
OK -- Continue to next step.

6. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU AND SWITCH - FRONT VERTICAL MOTOR)

(a) Disconnect the X4 position control ECU and switch assembly connector.

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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY Removal