| Last Modified: 08-21-2023 | 6.11:8.1.0 | Doc ID: RM100000001APTK |
| Model Year Start: 2019 | Model: Avalon | Prod Date Range: [04/2018 - ] |
| Title: SEAT: FRONT POWER SEAT CONTROL SYSTEM (for Gasoline Model with Memory): B2653; Lifter Sensor Malfunction; 2019 - 2022 MY Avalon [04/2018 - ] | ||
|
DTC |
B2653 |
Lifter Sensor Malfunction |
DESCRIPTION
When the position control ECU assembly does not receive a lifter motor position sensor signal despite the seat having been moved upward or downward by power seat motor operation, this DTC is stored.
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
|---|---|---|---|
|
B2653 |
Lifter Sensor Malfunction |
Lifter motor position sensor signal not received when power seat moved upward or downward |
|
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 B2653 is not output.
| OK |
|
|
|
3. |
PERFORM ACTIVE TEST USING TECHSTREAM (SEAT LIFTER OPERATION) |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Driver Seat / Active Test.
(e) Perform the Active Test according to the display on the Techstream.
Body Electrical > Driver Seat > Active Test
|
Tester Display |
Measurement Item |
Control Range |
Diagnostic Note |
|---|---|---|---|
|
Lifter Operation |
Seat lifter operation |
OFF/Down/Up |
- |
Body Electrical > Driver Seat > Active Test
|
Tester Display |
|---|
|
Lifter Operation |
OK:
Lifter motor operates normally.
| NG |
|
|
|
4. |
CHECK POSITION CONTROL ECU ASSEMBLY (LIFTER MOTOR CIRCUIT) |
(a) Disconnect 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 |
|
|
|
5. |
CHECK LIFTER MOTOR (SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY LH) |
|
(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) - Body ground |
Lifter motor operating |
4.5 to 4.8 V |
| OK |
|
REPLACE POSITION CONTROL ECU ASSEMBLY
|
| NG |
|
REPLACE LIFTER MOTOR (SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY LH)
|
|
6. |
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) 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 |
| OK |
|
REPLACE POSITION CONTROL ECU ASSEMBLY
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
7. |
INSPECT LIFTER MOTOR (SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY LH) |
(a) Remove the lifter motor (separate type front seat cushion spring assembly LH).
Click here
![2019 - 2020 MY Avalon Avalon HV [04/2018 - 08/2020]; SEAT: FRONT SEAT ASSEMBLY: DISASSEMBLY](/t3Portal/stylegraphics/info.gif)
(b) Inspect the lifter motor (separate type front seat cushion spring assembly LH).
Click here
| NG |
|
REPLACE LIFTER MOTOR (SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY LH)
|
|
|
8. |
CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - LIFTER MOTOR (SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY LH)) |
(a) Disconnect the R33 and R30 position control ECU assembly connectors.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
R33-6 (LFT+) - R29-3 (LFT+) |
Always |
Below 1 Ω |
|
R33-6 (LFT+) or R29-3 (LFT+) - Body ground |
Always |
10 kΩ or higher |
|
R30-5 (LFT-) - R29-1 (LFT-) |
Always |
Below 1 Ω |
|
R30-5 (LFT-) or R29-1 (LFT-) - Body ground |
Always |
10 kΩ or higher |
| OK |
|
REPLACE POSITION CONTROL ECU ASSEMBLY
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|