| Last Modified: 08-21-2023 | 6.11:8.1.0 | Doc ID: RM100000001BZBX |
| Model Year Start: 2019 | Model: Avalon HV | Prod Date Range: [04/2018 - ] |
| Title: SEAT: FRONT POWER SEAT CONTROL SYSTEM (for HV Model with Memory): B2658; Short in Sensor with Motor Power Supply Circuit; 2019 - 2022 MY Avalon HV [04/2018 - ] | ||
|
DTC |
B2658 |
Short in Sensor with Motor Power Supply Circuit |
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. |
|
WIRING DIAGRAM
PROCEDURE
|
1. |
CLEAR DTC |
(a) Clear the DTCs.
Body Electrical > Driver Seat > Clear DTCs
|
|
2. |
CHECK FOR DTC |
(a) Check for DTCs.
Body Electrical > Driver Seat > Trouble Codes
OK:
DTC B2658 is not output.
| OK |
|
|
|
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 |
|
|
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
|
|
|
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 |
|
|
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
|
|
|
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 |
|
|
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
|
|
|
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 |
|
|
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
|
|
|
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
![2019 - 2020 MY Avalon Avalon HV [04/2018 - 08/2020]; SEAT: FRONT SEAT ASSEMBLY: DISASSEMBLY](/t3Portal/stylegraphics/info.gif)
|
|
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) |
|
|
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
|
|
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) |
|
|
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
|
|
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) |
|
|
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
|
|
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
|
|
|