DTC    B2651    Reclining Sensor Malfunction

for Preparation Click here


DESCRIPTION

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

DTC Code
DTC Detection Condition
Trouble Area
B2651
The forward and backward lock detection position of the sensor is the same.
  1. Position control ECU and switch assembly
  2. Reclining motor (Separate type front seat back spring assembly)
  3. Wire harness or connector

WIRING DIAGRAM


for LHD

B260685E07


for RHD

B260685E06


INSPECTION PROCEDURE

1.PERFORM ACTIVE TEST USING INTELLIGENT TESTER (RECLINING 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 Ranger
    		Diagnostic Note
    Seat Reclining
    		Seat reclining operation
    		Front / OFF / Rear
    		-

    OK:
    Motor operates normally.



NG
Go to step 5
OK


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

  1. Disconnect the Z1*1 or Y1*2 reclining 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
    Z1-2 - Z1-3
    		Reclining switch on
    		4.8 to 5.1 V
    for RHD 
    Tester Connection
    		Switch Condition
    		Specified Condition
    Y1-2 - Y1-3
    		Reclining switch on
    		4.8 to 5.1 V



NG
Go to step 4
OK


3.CHECK RECLINING MOTOR (SEPARATE TYPE FRONT SEAT BACK SPRING ASSEMBLY)


    B238515E24

  1. Reconnect the Z1*1 or Y1*2 reclining 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
    Z1-2 - Body ground
    		Reclining switch on
    		4.5 to 4.8 V
    for RHD 
    Tester Connection
    		Switch Condition
    		Specified Condition
    Y1-2 - Body ground
    		Reclining switch on
    		4.5 to 4.8 V

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



NG
REPLACE RECLINING MOTOR (SEPARATE TYPE FRONT SEAT BACK SPRING ASSEMBLY) (Click here)
OK

REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY (Click here)  

4.CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU AND SWITCH ASSEMBLY - RECLINING 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
    X5-11 (SSRR) - Z1-2
    		Always
    		Below 1 Ω
    X5-1 (SGND) - Z1-3
    		Always
    		Below 1 Ω
    X5-11 (SSRR) - Body ground
    		Always
    		10 kΩ or higher
    X5-1 (SGND) - Body ground
    		Always
    		10 kΩ or higher
    for RHD 
    Tester Connection
    		Condition
    		Specified Condition
    W4-11 (SSRR) - Y1-2
    		Always
    		Below 1 Ω
    W4-1 (SGND) - Y1-3
    		Always
    		Below 1 Ω
    W4-11 (SSRR) - 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 RECLINING MOTOR (SEPARATE TYPE FRONT SEAT BACK SPRING ASSEMBLY)


    B238256E14

  1. Disconnect the Z1*1 or Y1*2 reclining motor connector.

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

  1. Check if the seat back moves smoothly when the auxiliary battery is connected to the reclining motor connector terminals.

    OK:
    Measurement Condition
    		Operational Direction
    Auxiliary battery positive (+) → 4
    Auxiliary battery negative (-) → 1
    		Seat back moves forward
    Auxiliary battery positive (+) → 1
    Auxiliary battery negative (-) → 4
    		Seat back moves backward

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



NG
REPLACE RECLINING MOTOR (SEPARATE TYPE FRONT SEAT BACK SPRING ASSEMBLY) (Click here)
OK


6.CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU AND SWITCH ASSEMBLY - RECLINING 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
    X4-9 (RCL+) - Z1-4
    		Always
    		Below 1 Ω
    X4-11 (RCL-) - Z1-1
    		Always
    		Below 1 Ω
    X4-9 (RCL+) - Body ground
    		Always
    		10 kΩ or higher
    X4-11 (RCL-) - Body ground
    		Always
    		10 kΩ or higher
    for RHD 
    Tester Connection
    		Condition
    		Specified Condition
    W3-9 (RCL+) - Y1-4
    		Always
    		Below 1 Ω
    W3-11 (RCL-) - Y1-1
    		Always
    		Below 1 Ω
    W3-9 (RCL+) - Body ground
    		Always
    		10 kΩ or higher
    W3-11 (RCL-) - Body ground
    		Always
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY (Click here)