Toyota 4Runner: Slide Sensor Malfunction (B2650)

Toyota 4Runner Service Manual / Vehicle Interior / Seat / Front Power Seat Control System(w/ Memory) / 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.

DTC Code	DTC Detection Condition	Trouble Area
B2650	The forward and backward lock detection position of the sensor is the same.	Front power seat switch LH Separate type front seat cushion spring assembly LH (Slide 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
Seat Slide Operation	Seat sliding operation	Front / OFF / Rear	-

OK:

Motor operates normally.

GO TO STEP 5

2.	CHECK FRONT POWER SEAT SWITCH LH (SLIDE MOTOR CIRCUIT)

(a) Disconnect the b15 slide motor connector.

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
b15-2 (O/P) - b15-3 (GND)	Sliding 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 [Slide Motor])

GO TO STEP 4

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

(a) Connect the b15 slide motor connector.

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
b15-2 (O/P) - Body ground	Sliding switch on	4.5 to 4.8 V

Text in Illustration

*a	Component with harness connected (Separate Type Front Seat Cushion Spring Assembly LH [Slide Motor])

REPLACE FRONT POWER SEAT SWITCH LH

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

4.	CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH - SLIDE MOTOR)

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

(b) Disconnect the b15 slide motor connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
b19-5 (SSRS) - b15-2 (O/P)	Always	Below 1 Ω
b19-1 (SGND) - b15-3 (GND)	Always	Below 1 Ω
b19-5 (SSRS) - Body ground	Always	10 kΩ or higher
b19-1 (SGND) - Body ground	Always	10 kΩ or higher

REPLACE FRONT POWER SEAT SWITCH LH

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

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

(b) Disconnect the b15 slide motor connector.

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

OK:

Measurement Condition	Specified Condition
Battery positive (+) → 4 (FWD) Battery negative (-) → 1 (BACK)	Front seat cushion spring assembly LH moves forward
Battery positive (+) → 1 (BACK) Battery negative (-) → 4 (FWD)	Front seat cushion spring assembly LH moves backward

Measurement Condition

Specified Condition

Battery positive (+) → 4 (FWD)

Battery negative (-) → 1 (BACK)

Front seat cushion spring assembly LH moves forward

Battery positive (+) → 1 (BACK)

Battery negative (-) → 4 (FWD)

Front seat cushion spring assembly LH moves backward

Text in Illustration

*a	Component without harness connected (Separate Type Front Seat Cushion Spring Assembly LH [Slide Motor])

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

6.	CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH LH - SLIDE MOTOR)

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

(b) Disconnect the b15 slide motor connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
b18-3 (SLD+) - b15-4 (FWD)	Always	Below 1 Ω
b18-4 (SLD-) - b15-1 (BACK)	Always	Below 1 Ω
b18-3 (SLD+) - Body ground	Always	10 kΩ or higher
b18-4 (SLD-) - Body ground	Always	10 kΩ or higher

REPLACE FRONT POWER SEAT SWITCH LH

REPAIR OR REPLACE HARNESS OR CONNECTOR

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 st ...

Front Power Seat does not Operate with Front Power Seat Switch

DESCRIPTION When a signal is input into the front power seat switch LH (position control ECU), the ECU manages the signals received from the front power seat switch LH and operates each motor. Wh ...

Other materials about Toyota 4Runner:

Short in Sensor with Motor Power Supply Circuit (B2658)
DESCRIPTION This DTC is stored when a power seat motor operates (a position control sensor is being supplied with power) and the power supply voltage does not rise to the specified value. DTC Code DTC Detection Condition ...

If your vehicle overheats
If your engine overheats: Stop the vehicle in a safe place and turn off the air conditioning system. Check to see if steam is coming out from under the hood. If you see steam: Stop the engine. Carefully lift the hood after the steam subsides and then ...