Toyota 4Runner manuals

Toyota 4Runner: Lifter Sensor Malfunction (B2653)

DESCRIPTION

When the front power seat switch LH does not receive a sensor signal despite upward or downward movement of the seat by power seat motor operation, this DTC is stored.

DTC Code

DTC Detection Condition

Trouble Area

B2653

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 (Lifter 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 ).


Tester Display

Test Part

Control Range

Diagnostic Note

Lifter Operation

Seat lifter operation

Up / OFF / Down

-

OK:

Motor operates normally.


NG

GO TO STEP 5


OK

2.

CHECK FRONT POWER SEAT SWITCH LH (LIFTER MOTOR CIRCUIT)

(a) Disconnect the b17 lifter motor connector.


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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

b17-2 (O/P) - b17-3 (GND)

Lifter 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 [Lifter Motor])


NG

GO TO STEP 4


OK

3.

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

(a) Connect the b17 lifter motor connector.


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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

b17-2 (O/P) - Body ground

Lifter switch on

4.5 to 4.8 V

Text in Illustration

*a

Component with harness connected

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


OK

REPLACE FRONT POWER SEAT SWITCH LH


NG

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

4.

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

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

(b) Disconnect the b17 lifter motor connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

b19-4 (SSRL) - b17-2 (O/P)

Always

Below 1 Ω

b19-1 (SGND) - b17-3 (GND)

Always

Below 1 Ω

b19-4 (SSRL) - 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 (LIFTER MOTOR)

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



(b) Disconnect the b17 lifter motor connector.

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

OK:

Measurement Condition

Operational Direction

Battery positive (+) → 1 (UP)

Battery negative (-) → 4 (DOWN)

Seat cushion spring moves upward

Battery positive (+) → 4 (DOWN)

Battery negative (-) → 1 (UP)

Seat cushion spring moves downward

Text in Illustration

*a

Component without harness connected

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


NG

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


OK

6.

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

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

(b) Disconnect the b17 lifter motor connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

b18-10 (LFT+) - b17-1 (UP)

Always

Below 1 Ω

b18-12 (LFT-) - b17-4 (DOWN)

Always

Below 1 Ω

b18-10 (LFT+) - Body ground

Always

10 kΩ or higher

b18-12 (LFT-) - Body ground

Always

10 kΩ or higher


OK

REPLACE FRONT POWER SEAT SWITCH LH


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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