Toyota 4Runner manuals

Toyota 4Runner: Front Vertical Sensor Malfunction (B2652)

DESCRIPTION

When the front power seat switch LH 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.

DTC Code

DTC Detection Condition

Trouble Area

B2652

The upward and downward lock detection position of the sensor is the same.

  • Front power seat switch LH
  • Separate type front seat cushion Spring assembly LH (Front vertical motor)
  • Harness or connector

WIRING DIAGRAM


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 (See page ).


Driver Seat

Tester Display

Test Part

Control Range

Diagnostic Note

Front Vertical Operation

Seat front vertical operation

Up / OFF / Down

-

OK:

Motor operates normally.


NG

GO TO STEP 5


OK

2.

CHECK FRONT POWER SEAT SWITCH LH (FRONT VERTICAL MOTOR CIRCUIT)

(a) Disconnect the b16 front vertical motor connector.


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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

b16-2 (O/P) - b16-3 (GND)

Front vertical switch on

4.8 to 5.1 V

Text in Illustration

*a

Front view of wire harness connector

(to Separate Type Front Seat Cushion Spring Assembly LH [Front Vertical Motor])


NG

GO TO STEP 4


OK

3.

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

(a) Connect the b16 front vertical motor connector.


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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

b16-2 (O/P) - Body ground

Front vertical switch on

4.5 to 4.8 V

Text in Illustration

*a

Component with harness connected

(Separate Type Front Seat Cushion Spring Assembly LH [Front Vertical Motor])


OK

REPLACE FRONT POWER SEAT SWITCH LH


NG

REPLACE SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY LH (FRONT VERTICAL MOTOR)

4.

CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH LH - FRONT VERTICAL MOTOR)

(a) Disconnect the b19 front power seat switch LH connector.

(b) Disconnect the b16 front vertical motor connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

b19-3 (SSFV) - b16-2 (O/P)

Always

Below 1 Ω

b19-1 (SGND) - b16-3 (GND)

Always

Below 1 Ω

b19-3 (SSFV) - Body ground

Always

10 kΩ or higher

b19-1 (SGND) - Body ground

Always

10 kΩ or higher


OK

REPLACE FRONT POWER SEAT SWITCH LH


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.

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

(a) Remove the separate type front seat cushion spring assembly LH (front vertical motor) (See page ).



(b) Disconnect the b16 front vertical motor.

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

OK:

Measurement Condition

Operational Direction

Battery positive (+) → 4 (UP)

Battery negative (-) → 1 (DOWN)

Seat cushion spring moves upward

Battery positive (+) → 1 (DOWN)

Battery negative (-) → 4 (UP)

Seat cushion spring moves downward

Text in Illustration

*a

Component without harness connected

(Separate Type Front Seat Cushion Spring Assembly LH [Front Vertical Motor])


NG

REPLACE SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY LH (FRONT VERTICAL MOTOR)


OK

6.

CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH LH - FRONT VERTICAL MOTOR)

(a) Disconnect the b18 front power seat switch LH connector.

(b) Disconnect the b16 front vertical motor connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

b18-8 (FRV+) - b16-4 (UP)

Always

Below 1 Ω

b18-5 (FRV-) - b16-1 (DOWN)

Always

Below 1 Ω

b18-8 (FRV+) - Body ground

Always

10 kΩ or higher

b18-5 (FRV-) - Body ground

Always

10 kΩ or higher


OK

REPLACE FRONT POWER SEAT SWITCH LH


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

Reclining Sensor Malfunction (B2651)
DESCRIPTION When the front power seat switch LH does not receive a sensor signal despite forward or backward movement of the seatback by power seat motor operation, this DTC is stored. ...

Slide Sensor Malfunction (B2650)
DESCRIPTION When the front power seat switch LH does not receive a sensor signal despite forward or backward movement of the seat by power seat motor operation, this DTC is stored. DT ...

Other materials about Toyota 4Runner:

Dtc Check / Clear
DTC CHECK / CLEAR HINT: When using the Techstream with the ignition switch off to troubleshoot: Connect the Techstream to the vehicle and turn the front door courtesy light switch LH on and off at 1.5 second intervals until communication betw ...

Reverse Signal Circuit
DESCRIPTION The navigation receiver assembly receives a reverse signal from the park/neutral position switch assembly. WIRING DIAGRAM CAUTION / NOTICE / HINT NOTICE: After replacing the navigation receiver assembly of vehicles subscribed t ...

© 2016-2020 | www.to4runner.net

0.0107