DTC    B2652    Front Vertical Sensor Malfunction

for Preparation Click here


DESCRIPTION

When the position control ECU and switch assembly does not receive a sensor signal despite upward or downward movement of the front of the seat cushion by power seat motor operation, this DTC is stored.

DTC Code
DTC Detection Condition
Trouble Area
B2652
The upward and downward lock detection position of the sensor the same.
  1. Position control ECU and switch assembly
  2. Front vertical motor (Separate type front seat cushion spring assembly)
  3. Wire harness or connector

WIRING DIAGRAM


for LHD

B260685E03


for RHD

B260685E08


INSPECTION PROCEDURE

1.PERFORM ACTIVE TEST USING INTELLIGENT TESTER (FRONT VERTICAL MOTOR)

  1. Turn the power switch off.

  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Turn the intelligent tester on.

  1. Enter the following menus: Body / Driver Seat / Active Test.

  1. Perform the Active Test according to the display on the intelligent tester.

    Driver Seat (Position Control ECU and Switch Assembly) 
    Tester Display
    		Test Part
    		Control Range
    		Diagnostic Note
    Front Vertical Operation
    		Seat front vertical operation
    		Up / OFF / Down
    		-

    OK:
    Motor operates normally.



NG
Go to step 5
OK


2.CHECK POSITION CONTROL ECU AND SWITCH ASSEMBLY (FRONT VERTICAL MOTOR CIRCUIT)

  1. Disconnect the X2*1 or W2*2 front vertical motor connector.

    1. *1: for LHD
    2. *2: for RHD

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

    Standard Voltage:
    for LHD 
    Tester Connection
    		Switch Condition
    		Specified Condition
    X2-2 - X2-3
    		Front vertical switch on
    		4.8 to 5.1 V
    for RHD 
    Tester Connection
    		Switch Condition
    		Specified Condition
    W2-2 - W2-3
    		Front vertical switch on
    		4.8 to 5.1 V



NG
Go to step 4
OK


3.CHECK FRONT VERTICAL MOTOR (SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY)


    B238515E25

  1. Reconnect the X2*1 or W2*2 front vertical motor connector.

    1. *1: for LHD
    2. *2: for RHD

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

    Standard Voltage:
    for LHD 
    Tester Connection
    		Switch Condition
    		Specified Condition
    X2-2 - Body ground
    		Front vertical switch on
    		4.5 to 4.8 V
    for RHD 
    Tester Connection
    		Switch Condition
    		Specified Condition
    W2-2 - Body ground
    		Front vertical switch on
    		4.5 to 4.8 V

    Text in Illustration 
    *A
    		for LHD
    *B
    		for RHD
    *a
    		Component with harness connected
    (Front Vertical Motor (Separate Type Front Seat Cushion Spring Assembly))



NG
REPLACE FRONT VERTICAL MOTOR (SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY) (Click here)
OK

REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY (Click here)  

4.CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU AND SWITCH - FRONT VERTICAL MOTOR)

  1. Disconnect the X5*1 or W4*2 position control ECU and switch assembly connector.

    1. *1: for LHD
    2. *2: for RHD

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

    Standard Resistance:
    for LHD 
    Tester Connection
    		Condition
    		Specified Condition
    X5-3 (SSFV) - X2-2
    		Always
    		Below 1 Ω
    X5-1 (SGND) - X2-3
    		Always
    		Below 1 Ω
    X5-3 (SSFV) - Body ground
    		Always
    		10 kΩ or higher
    X5-1 (SGND) - Body ground
    		Always
    		10 kΩ or higher
    for RHD 
    Tester Connection
    		Condition
    		Specified Condition
    W4-3 (SSFV) - W2-2
    		Always
    		Below 1 Ω
    W4-1 (SGND) - W2-3
    		Always
    		Below 1 Ω
    W4-3 (SSFV) - Body ground
    		Always
    		10 kΩ or higher
    W4-1 (SGND) - Body ground
    		Always
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY (Click here)  

5.INSPECT FRONT VERTICAL MOTOR (SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY)


    B238256E14

  1. Disconnect the X2*1 or W2*2 front vertical motor connector.

    1. *1: for LHD
    2. *2: for RHD

  1. Check if the seat cushion spring moves smoothly when the auxiliary battery is connected to the front vertical motor connector terminals.

    OK:
    Measurement Condition
    		Operational Direction
    Auxiliary battery positive (+) → 4
    Auxiliary battery negative (-) → 1
    		Seat cushion spring moves upward
    Auxiliary battery positive (+) → 1
    Auxiliary battery negative (-) → 4
    		Seat cushion spring moves downward

    Text in Illustration 
    *a
    		Component without harness connected
    (Front Vertical Motor (Separate Type Front Seat Cushion Spring Assembly))



NG
REPLACE FRONT VERTICAL MOTOR (SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY) (Click here)
OK


6.CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU AND SWITCH - FRONT VERTICAL MOTOR)

  1. Disconnect the X4*1 or W3*2 position control ECU and switch assembly connector.

    1. *1: for LHD
    2. *2: for RHD

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

    Standard Resistance:
    for LHD 
    Tester Connection
    		Condition
    		Specified Condition
    X4-8 (FRV+) - X2-4
    		Always
    		Below 1 Ω
    X4-5 (FRV-) - X2-1
    		Always
    		Below 1 Ω
    X4-8 (FRV+) - Body ground
    		Always
    		10 kΩ or higher
    X4-5 (FRV-) - Body ground
    		Always
    		10 kΩ or higher
    for RHD 
    Tester Connection
    		Condition
    		Specified Condition
    W3-8 (FRV+) - W2-4
    		Always
    		Below 1 Ω
    W3-5 (FRV-) - W2-1
    		Always
    		Below 1 Ω
    W3-8 (FRV+) - Body ground
    		Always
    		10 kΩ or higher
    W3-5 (FRV-) - Body ground
    		Always
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY (Click here)