Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Short in Sensor with Motor Power Supply Circuit (B2658)

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Vehicle Interior / Seat / Front Power Seat Control System(for Gasoline Model With 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 No.

Detection Item

DTC Detection Condition

Trouble Area

B2658

Short in Sensor with Motor Power Supply Circuit

Problem with the voltage supplied to the position control sensor.
  • Position control ECU assembly
  • Slide motor (separate type front seat cushion spring assembly LH)
  • Front vertical motor (separate type front seat cushion spring assembly LH)
  • Lifter motor (separate type front seat cushion spring assembly LH)
  • Reclining motor (front seatback frame sub-assembly LH)
  • Wire harness or connector

WIRING DIAGRAM

PROCEDURE

1.

CLEAR DTC

(a) Clear the DTCs.

Body Electrical > Driver Seat > Clear DTCs
NEXT

2.

CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Driver Seat > Trouble Codes

OK:

DTC B2658 is not output.

OK

USE SIMULATION METHOD TO CHECK

NG

3.

CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - SLIDE MOTOR (SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY LH))

(a) Disconnect the R32 position control ECU assembly connector.

(b) Disconnect the R23 slide motor (separate type front seat cushion spring assembly LH) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

R32-26 (SSRS) - R23-5 (SSRS)

Always

Below 1 Ω

R32-26 (SSRS) or R23-5 (SSRS) - Body ground

Always

10 kΩ or higher

R32-12 (SENG) - R23-6 (SENG)

Always

Below 1 Ω

R32-12 (SENG) or R23-6 (SENG) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

4.

CHECK POSITION CONTROL ECU ASSEMBLY (SLIDE MOTOR CIRCUIT)

(a) Reconnect the R23 slide motor (separate type front seat cushion spring assembly LH) connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

R23-5 (SSRS) - R23-6 (SENG)

Slide switch on

4.8 to 5.1 V
NG

REPLACE POSITION CONTROL ECU ASSEMBLY

OK

5.

CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - FRONT VERTICAL MOTOR (SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY LH))

(a) Disconnect the R32 position control ECU assembly connector.

(b) Disconnect the R27 front vertical motor (separate type front seat cushion spring assembly LH) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

R32-10 (SSFV) - R27-4 (SSFV)

Always

Below 1 Ω

R32-10 (SSFV) or R27-4 (SSFV) - Body ground

Always

10 kΩ or higher

R32-12 (SENG) - R27-2 (SENG)

Always

Below 1 Ω

R32-12 (SENG) or R27-2 (SENG) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

6.

CHECK POSITION CONTROL ECU ASSEMBLY (FRONT VERTICAL MOTOR CIRCUIT)

(a) Reconnect the R27 front vertical motor (separate type front seat cushion spring assembly LH) connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

R27-4 (SSFV) - R27-2 (SENG)

Front vertical switch on

4.8 to 5.1 V
NG

REPLACE POSITION CONTROL ECU ASSEMBLY

OK

7.

CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - LIFTER MOTOR (SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY LH))

(a) Disconnect the R32 position control ECU assembly connector.

(b) Disconnect the R29 lifter motor (separate type front seat cushion spring assembly LH) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

R32-25 (SSRL) - R29-4 (SSRL)

Always

Below 1 Ω

R32-25 (SSRL) or R29-4 (SSRL) - Body ground

Always

10 kΩ or higher

R32-12 (SENG) - R29-2 (SENG)

Always

Below 1 Ω

R32-12 (SENG) or R29-2 (SENG) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

8.

CHECK POSITION CONTROL ECU ASSEMBLY (LIFTER MOTOR CIRCUIT)

(a) Reconnect the R29 lifter motor (separate type front seat cushion spring assembly LH) connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

R29-4 (SSRL) - R29-2 (SENG)

Lifter switch on

4.8 to 5.1 V
NG

REPLACE POSITION CONTROL ECU ASSEMBLY

OK

9.

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

(a) Disconnect the R32 position control ECU assembly connector.

(b) Disconnect the a10 reclining motor (front seatback frame sub-assembly LH) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

R32-11 (SSRR) - a10-4 (SSRR)

Always

Below 1 Ω

R32-11 (SSRR) or a10-4 (SSRR) - Body ground

Always

10 kΩ or higher

R32-12 (SENG) - a10-2 (SENG)

Always

Below 1 Ω

R32-12 (SENG) or a10-2 (SENG) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

10.

CHECK POSITION CONTROL ECU ASSEMBLY (RECLINING MOTOR CIRCUIT)

(a) Reconnect the a10 reclining motor (front seatback frame sub-assembly LH) connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

a10-4 (SSRR) - a10-2 (SENG)

Reclining switch on

4.8 to 5.1 V
NG

REPLACE POSITION CONTROL ECU ASSEMBLY

OK

11.

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

(a) Replace the front vertical motor (separate type front seat cushion spring assembly LH) with a new or known good one.

Click here

NEXT

12.

CHECK FOR DTC

(a) Clear the DTCs.

Body Electrical > Driver Seat > Clear DTCs

(b) Recheck for DTCs.

Body Electrical > Driver Seat > Trouble Codes

OK:

DTC B2685 is not output.

OK

END (FRONT VERTICAL MOTOR (SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY LH) WAS DEFECTIVE)
NG

13.

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

(a) Replace the lifter motor (separate type front seat cushion spring assembly LH) with a new or known good one.

Click here

NEXT

14.

CHECK FOR DTC

(a) Clear the DTCs.

Body Electrical > Driver Seat > Clear DTCs

(b) Recheck for DTCs.

Body Electrical > Driver Seat > Trouble Codes

OK:

DTC B2685 is not output.

OK

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

15.

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

(a) Replace the slide motor (separate type front seat cushion spring assembly LH) with a new or known good one.

Click here

NEXT

16.

CHECK FOR DTC

(a) Clear the DTCs.

Body Electrical > Driver Seat > Clear DTCs

(b) Recheck for DTCs.

Body Electrical > Driver Seat > Trouble Codes

OK:

DTC B2685 is not output.

OK

END (SLIDE MOTOR (SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY LH) WAS DEFECTIVE)
NG

17.

REPLACE RECLINING MOTOR (FRONT SEATBACK FRAME SUB-ASSEMBLY LH)

(a) Replace the reclining motor (front seatback frame sub-assembly LH) with a new or known good one.

Click here

NEXT

18.

CHECK FOR DTC

(a) Clear the DTCs.

Body Electrical > Driver Seat > Clear DTCs

(b) Recheck for DTCs.

Body Electrical > Driver Seat > Trouble Codes

OK:

DTC B2685 is not output.

OK

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

REPLACE POSITION CONTROL ECU ASSEMBLY

    Lifter Sensor Malfunction (B2653)

    Customize Parameters

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