Toyota 4Runner manuals

Toyota 4Runner: 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.

DTC Code

DTC Detection Condition

Trouble Area

B2651

The forward and backward lock detection position of the sensor is the same.

  • Front power seat switch LH
  • Separate type front seatback spring assembly LH (Reclining 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 Ranger

Diagnostic Note

Seat Reclining

Seat reclining operation

Front / OFF / Rear

-

OK:

Motor operates normally.


NG

GO TO STEP 5


OK

2.

CHECK FRONT POWER SEAT SWITCH LH (RECLINING MOTOR CIRCUIT)

(a) Disconnect the d5 reclining motor connector.


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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

d5-2 (O/P) - d5-3 (GND)

Reclining switch on

4.8 to 5.1 V

Text in Illustration

*a

Front view of wire harness connector

(to Separate Type Front Seatback Spring Assembly LH [Reclining Motor])


NG

GO TO STEP 4


OK

3.

CHECK SEPARATE TYPE FRONT SEATBACK SPRING ASSEMBLY LH (RECLINING MOTOR)

(a) Connect the d5 reclining motor connector.


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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

d5-2 (O/P) - Body ground

Reclining switch on

4.5 to 4.8 V

Text in Illustration

*a

Component with harness connected

(Separate Type Front Seatback Spring Assembly LH [Reclining Motor])


OK

REPLACE FRONT POWER SEAT SWITCH LH


NG

REPLACE SEPARATE TYPE FRONT SEATBACK SPRING ASSEMBLY LH (RECLINING MOTOR)

4.

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

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

(b) Disconnect the d5 reclining motor connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

b19-11 (SSRR) - d5-2 (O/P)

Always

Below 1 Ω

b19-1 (SGND) - d5-3 (GND)

Always

Below 1 Ω

b19-11 (SSRR) - 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 SEATBACK SPRING ASSEMBLY LH (RECLINING MOTOR)

(a) Remove the front seatback board sub-assembly (See page ).



(b) Disconnect the b5 reclining motor connector.

(c) Check if the seatback moves smoothly when the battery is connected to the reclining motor connector terminals.

OK:

Measurement Condition

Operational Direction

Battery positive (+) → 1 (FWD)

Battery negative (-) → 4 (BACK)

Seatback moves forward

Battery positive (+) → 4 (BACK)

Battery negative (-) → 1 (FWD)

Seatback moves backward

Text in Illustration

*a

Component without harness connected

(Separate Type Front Seatback Spring Assembly LH [Reclining Motor])


NG

REPLACE SEPARATE TYPE FRONT SEATBACK SPRING ASSEMBLY LH (RECLINING MOTOR)


OK

6.

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

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

(b) Disconnect the d5 reclining motor connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

b18-9 (RCL+) - d5-1 (FWD)

Always

Below 1 Ω

b18-11 (RCL-) - d5-4 (BACK)

Always

Below 1 Ω

b18-9 (RCL+) - Body ground

Always

10 kΩ or higher

b18-11 (RCL-) - 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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