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 |
- Position control ECU assembly
- Lifter motor (separate type front seat cushion spring assembly LH)
- Wire harness or connector
| WIRING DIAGRAM
 PROCEDURE
(a) Clear the DTCs. Body Electrical > Driver Seat > Clear DTCs
|
NEXT |
 | |
(a) Check for DTCs. Body Electrical > Driver Seat > Trouble Codes
OK: DTC B2653 is not output.
| OK |
 | USE SIMULATION METHOD TO CHECK |
|
NG | |
| |
| 3. |
PERFORM ACTIVE TEST USING TECHSTREAM (SEAT LIFTER OPERATION) |
(a) Connect the Techstream to the DLC3. (b) Turn the power 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 |
| GO TO STEP 7 |
|
OK | |
| |
| 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 |
| GO TO STEP 6 |
|
OK | |
| |
| 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. |
 |
|
*a | Component with harness connected
(Lifter Motor (Separate Type Front Seat Cushion Spring Assembly LH)) | | |
(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  (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) |
|
OK | |
| |
| 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 | | 
