Toyota Tundra Service Manual: Short in Sensor with Motor Power Supply Circuit (B2658)

Toyota Tundra 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.

  • Position control ECU and switch assembly
  • Front seat cushion frame sub-assembly LH
  • Front seatback frame sub-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.

OK

USE SIMULATION METHOD TO CHECK

NG

2.

CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU AND SWITCH ASSEMBLY - FRONT SEAT CUSHION FRAME SUB-ASSEMBLY LH)

(a) Disconnect the Z10 position control ECU and switch assembly connector.

(b) Disconnect the Z3 front seat cushion frame sub-assembly LH (slide motor) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Z10-5 (SSRS) - Z3-5

Always

Below 1 Ω

Z10-1 (SGND) - Z3-6

Always

Below 1 Ω

Z10-5 (SSRS) - Z10-1 (SGND)

Always

10 kΩ or higher

Z10-5 (SSRS) or Z3-5 - Body ground

Always

10 kΩ or higher

Z10-1 (SGND) or Z3-6 - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

CHECK POSITION CONTROL ECU AND SWITCH ASSEMBLY (SLIDE MOTOR CIRCUIT)

(a) Reconnect the Z10 position control ECU and switch assembly connector.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

Z3-5 - Z3-6

Sliding switch on

4.8 to 5.1 V

Text in Illustration

*a

Front view of wire harness connector

(to Front Seat Cushion Frame Sub-assembly LH [Slide Motor])

NG

REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY

OK

4.

CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU AND SWITCH ASSEMBLY - FRONT SEAT CUSHION FRAME SUB-ASSEMBLY LH)

(a) Disconnect the Z10 position control ECU and switch assembly connector.

(b) Disconnect the Z4 front seat cushion frame sub-assembly LH (lifter motor) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Z10-4 (SSRL) - Z4-4

Always

Below 1 Ω

Z10-1 (SGND) - Z4-3

Always

Below 1 Ω

Z10-4 (SSRL) - Z10-1 (SGND)

Always

10 kΩ or higher

Z10-4 (SSRL) or Z4-4 - Body ground

Always

10 kΩ or higher

Z10-1 (SGND) or Z4-3 - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.

CHECK POSITION CONTROL ECU AND SWITCH ASSEMBLY (LIFTER MOTOR CIRCUIT)

(a) Reconnect the Z10 position control ECU and switch assembly connector.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

Z4-4 - Z4-3

Lifter switch on

4.8 to 5.1 V

Text in Illustration

*a

Front view of wire harness connector

(to Front Seat Cushion Frame Sub-assembly LH [Lifter Motor])

NG

REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY

OK

6.

CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU AND SWITCH ASSEMBLY - FRONT SEAT CUSHION FRAME SUB-ASSEMBLY LH)

(a) Disconnect the Z10 position control ECU and switch assembly connector.

(b) Disconnect the Z14 front seat cushion frame sub-assembly LH (vertical motor) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Z10-3 (SSFV) - Z14-2

Always

Below 1 Ω

Z10-1 (SGND) - Z14-1

Always

Below 1 Ω

Z10-3 (SSFV) - Z10-1 (SGND)

Always

10 kΩ or higher

Z10-3 (SSFV) or Z14-2 - Body ground

Always

10 kΩ or higher

Z10-1 (SGND) or Z14-1 - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

7.

CHECK POSITION CONTROL ECU AND SWITCH ASSEMBLY (VERTICAL MOTOR CIRCUIT)

(a) Reconnect the Z10 position control ECU and switch assembly connector.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

Z14-2 - Z14-1

Front vertical switch on

4.8 to 5.1 V

Text in Illustration

*a

Front view of wire harness connector

(to Front Seat Cushion Frame Sub-assembly LH [Vertical Motor])

NG

REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY

OK

8.

CHECK FRONT SEAT CUSHION FRAME SUB-ASSEMBLY LH

(a) Temporarily replace the front seat cushion frame sub-assembly LH with a new or normally functioning one (See page ).

(b) Clear the DTCs (See page ).

(c) Check for DTCs (See page ).

OK:

DTC B2658 is not output.

OK

END (FRONT SEAT CUSHION FRAME SUB-ASSEMBLY LH WAS DEFECTIVE)

NG

9.

CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU AND SWITCH ASSEMBLY - FRONT SEATBACK FRAME SUB-ASSEMBLY LH)

(a) Disconnect the Z10 position control ECU and switch assembly connector.

(b) Disconnect the Z6 front seatback frame sub-assembly LH (reclining motor) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Z10-11 (SSRR) - Z6-4

Always

Below 1 Ω

Z10-1 (SGND) - Z6-3

Always

Below 1 Ω

Z10-11 (SSRR) - Z10-1 (SGND)

Always

10 kΩ or higher

Z10-11 (SSRR) or Z6-4 - Body ground

Always

10 kΩ or higher

Z10-1 (SGND) or Z6-3 - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

10.

CHECK POSITION CONTROL ECU AND SWITCH ASSEMBLY (RECLINING MOTOR CIRCUIT)

(a) Reconnect the Z10 position control ECU and switch assembly connector.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

Z6-4 - Z6-3

Reclining switch on

4.8 to 5.1 V

Text in Illustration

*a

Front view of wire harness connector

(to Front Seatback Frame Sub-assembly LH [Reclining Motor])

NG

REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY

OK

11.

CHECK FRONT SEATBACK FRAME SUB-ASSEMBLY LH

(a) Temporarily replace the front seatback frame sub-assembly LH (reclining motor) with a new or normally functioning one (See page ).

(b) Clear the DTCs (See page ).

(c) Check for DTCs (See page ).

OK:

DTC B2658 is not output.

OK

END (FRONT SEATBACK FRAME SUB-ASSEMBLY LH WAS DEFECTIVE)

NG

REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY

    Lifter Sensor Malfunction (B2653)

    Customize Parameters

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