Toyota 4Runner: Short in Sensor with Motor Power Supply Circuit (B2658)

Toyota 4Runner Service Manual / Vehicle Interior / Seat / Front Power Seat Control System(w/ Memory) / 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	Trouble Area
B2658	A problem with the voltage supplied to the position control sensor.	Front power seat switch LH Separate type front seat cushion spring assembly LH Separate type front seatback spring assembly LH Harness or connector

WIRING DIAGRAM

PROCEDURE

1.	CHECK FOR DTC

(a) Clear the DTCs (See page ).

(b) Check for DTCs (See page ).

OK:

DTC B2658 is not output.

USE SIMULATION METHOD TO CHECK

2.	CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH LH - 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) - b19-1 (SGND)	Always	10 kΩ or higher
b19-5 (SSRS) - Body ground	Always	10 kΩ or higher
b19-1 (SGND) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

(a) Connect the b19 front power seat switch LH 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])

REPLACE FRONT POWER SEAT SWITCH LH

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.

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) - b19-1 (SGND)	Always	10 kΩ or higher
b19-3 (SSFV) - Body ground	Always	10 kΩ or higher
b19-1 (SGND) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

(a) Connect the b19 front power seat switch LH 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])

REPLACE FRONT POWER SEAT SWITCH LH

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

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

(b) Disconnect the b17 lifter motor connector.

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) - b19-1 (SGND)	Always	10 kΩ or higher
b19-4 (SSRL) - Body ground	Always	10 kΩ or higher
b19-1 (SGND) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.	CHECK FRONT POWER SEAT SWITCH LH (LIFTER MOTOR CIRCUIT)

(a) Connect the b19 front power seat switch LH 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])

REPLACE FRONT POWER SEAT SWITCH LH

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

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

(b) Disconnect the d5 reclining motor connector.

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) - b19-1 (SGND)	Always	10 kΩ or higher
b19-11 (SSRR) - Body ground	Always	10 kΩ or higher
b19-1 (SGND) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

9.	CHECK FRONT POWER SEAT SWITCH LH (RECLINING MOTOR CIRCUIT)

(a) Connect the b19 front power seat switch LH 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])

REPLACE FRONT POWER SEAT SWITCH LH

10.	CHECK SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY LH

(a) Temporarily replace the separate type front seat cushion spring with a new or normally functioning one (See page ).

(b) Clear the DTCs (See page ).

OK:

DTC B2658 is not output.

END (SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY LH IS DEFECTIVE)

11.	CHECK SEPARATE TYPE FRONT SEATBACK SPRING ASSEMBLY LH

(a) Temporarily replace the separate type front seatback spring with a new or normally functioning one (See page ).

(b) Clear the DTCs (See page ).

OK:

DTC B2658 is not output.

END (SEPARATE TYPE FRONT SEATBACK SPRING ASSEMBLY LH IS DEFECTIVE)

REPLACE FRONT POWER SEAT SWITCH LH

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 ...

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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. ...

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