DESCRIPTION When the
position control ECU assembly does not receive a front vertical 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 | |
B2652 | Front Vertical Sensor Malfunction |
Front vertical motor position sensor signal not received when power seat moved upward or downward |
- Position control ECU assembly
- Front vertical 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 B2652 is not output.
| OK |
 | USE SIMULATION METHOD TO CHECK |
|
NG | |
| |
| 3. |
PERFORM ACTIVE TEST USING TECHSTREAM (SEAT FRONT VERTICAL 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 | |
Front Vertical Operation |
Seat front vertical operation |
OFF/Down/Up | - | Body Electrical > Driver Seat > Active Test
|
Tester Display | | Front Vertical Operation |
OK: Front vertical motor operates normally.
| NG |
| GO TO STEP 7 |
|
OK | |
| |
| 4. |
CHECK POSITION CONTROL ECU ASSEMBLY (FRONT VERTICAL MOTOR CIRCUIT) |
(a) Disconnect 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 |
| GO TO STEP 6 |
|
OK | |
| |
| 5. |
CHECK FRONT VERTICAL MOTOR (SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY LH) |
| (a) Reconnect the R27 front vertical motor (separate type front seat cushion spring assembly LH) connector. |
 |
|
*a | Component with harness connected
(Front Vertical 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 | |
R27-4 (SSFV) - Body ground |
Front vertical motor operating |
4.5 to 4.8 V |
| OK |
| REPLACE POSITION CONTROL ECU ASSEMBLY |
| NG |
| REPLACE FRONT VERTICAL MOTOR (SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY LH) |
| 6. |
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) 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 |
| OK |
| REPLACE POSITION CONTROL ECU ASSEMBLY |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 7. |
INSPECT FRONT VERTICAL MOTOR (SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY LH) |
(a) Remove the front vertical motor (separate type front seat cushion spring assembly LH).
Click here  (b) Inspect the front vertical motor (separate type front seat cushion spring assembly LH).
Click here
| NG |
| REPLACE FRONT VERTICAL MOTOR (SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY LH) |
|
OK | |
| |
| 8. |
CHECK
HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - FRONT VERTICAL
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 | |
R33-7 (FRV+) - R27-3 (FRV+) |
Always | Below 1 Ω | |
R33-7 (FRV+) or R27-3 (FRV+) - Body ground |
Always | 10 kΩ or higher | |
R30-4 (FRV-) - R27-1 (FRV-) |
Always | Below 1 Ω | |
R30-4 (FRV-) or R27-1 (FRV-) - Body ground |
Always | 10 kΩ or higher |
| OK |
| REPLACE POSITION CONTROL ECU ASSEMBLY |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR | | 
