Dtc B1655/37 Driver Side Seat Belt Buckle Switch Circuit Malfunction

Vehicle Interior. Yaris. Ncp93, 131
Supplemental Restraint Systems. Yaris. Ncp93, 131

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK DTC

CHECK CONNECTION OF CONNECTORS

CHECK FLOOR WIRE (FOR OPEN)

CHECK FLOOR WIRE (FOR GROUND)

CHECK FLOOR WIRE (TO B+)

CHECK FLOOR WIRE (TO GROUND)

CHECK FRONT SEAT INNER BELT ASSEMBLY LH

REPLACE FRONT SEAT INNER BELT ASSEMBLY LH

CHECK CENTER AIRBAG SENSOR ASSEMBLY

DTC B1655/37 Driver Side Seat Belt Buckle Switch Circuit Malfunction


DESCRIPTION

The driver side seat belt buckle switch circuit consists of the center airbag sensor assembly and the front seat inner belt assembly LH.
DTC B1655/37 is recorded when a malfunction is detected in the driver side seat belt buckle switch circuit.

DTC No.
DTC Detecting Condition
Trouble Area
B1655/37
  1. Center airbag sensor assembly detects line short circuit signal, open circuit signal, short circuit to ground signal or short circuit to B+ signal in driver side seat belt buckle switch circuit for 2 seconds.
  2. Front seat inner belt assembly LH malfunction
  3. Center airbag sensor assembly malfunction
  1. Floor wire
  2. Front seat inner belt assembly LH
  3. Center airbag sensor assembly

WIRING DIAGRAM


Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). Dtc B1655/37 Driver Side Seat Belt Buckle Switch Circuit Malfunction


INSPECTION PROCEDURE

NOTICE:
In order to prevent unexpected airbag deployment, disconnect the following connectors before inspecting parts such as wire harnesses, if the application of tester probes to the center airbag sensor assembly connector is necessary.
  1. Turn the ignition switch to the lock position.
  2. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
  3. Disconnect the connector from the center airbag sensor assembly.
  4. Disconnect the connectors from the steering pad.
  5. Disconnect the connectors from the front passenger airbag assembly.
  6. Disconnect the connector from the front seat outer belt assembly LH.
  7. Disconnect the connector from the front seat outer belt assembly RH.
    HINT:
    Skip the following steps if side and curtain shield airbags are not fitted.
  8. Disconnect the connector from the front seat side airbag assembly LH.
  9. Disconnect the connector from the front seat side airbag assembly RH.
  10. Disconnect the connector from the curtain shield airbag assembly LH.
  11. Disconnect the connector from the curtain shield airbag assembly RH.
1.CHECK DTC
Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). Dtc B1655/37 Driver Side Seat Belt Buckle Switch Circuit Malfunction

  1. Turn the ignition switch on, and wait for at least 60 seconds.

  1. Clear the DTCs stored in the memory (YARIS_NCP93 RM000000XFE0D2X.html).

  1. Turn the ignition switch off.

  1. Turn the ignition switch on, and wait for at least 60 seconds.

  1. Check the DTCs (YARIS_NCP93 RM000000XFE0D2X.html).

    OK:
    DTC B1655/37 is not output.
    HINT:
    DTCs other than DTC B1655/37 may be output at this time, but they are not related to this check.


OK
USE SIMULATION METHOD TO CHECK
NG


2.CHECK CONNECTION OF CONNECTORS

  1. Turn the ignition switch off.

  1. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.

  1. Check that the connectors are properly connected to the center airbag sensor assembly and the front seat inner belt assembly LH.

    OK:
    The connectors are properly connected.


NG
CONNECT CONNECTORS
OK


3.CHECK FLOOR WIRE (FOR OPEN)
Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). Dtc B1655/37 Driver Side Seat Belt Buckle Switch Circuit Malfunction

  1. Disconnect the connectors from the center airbag sensor assembly and the front seat inner belt assembly LH.

  1. Using a service wire, connect J8-11 (DBE+) and J8-12 (DBE-) of connector B.

    NOTICE:
    Do not forcibly insert the service wire into the terminals of the connector when connecting.

  1. Measure the resistance.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    J10-4 (LBE+) - J10-3 (LBE-)
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE FLOOR WIRE
OK


4.CHECK FLOOR WIRE (FOR GROUND)
Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). Dtc B1655/37 Driver Side Seat Belt Buckle Switch Circuit Malfunction

  1. Disconnect the service wire from connector B.

  1. Measure the resistance.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    J10-4 (LBE+) - J10-3 (LBE-)
    		Always
    		1 MΩ or higher


NG
REPAIR OR REPLACE FLOOR WIRE
OK


5.CHECK FLOOR WIRE (TO B+)
Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). Dtc B1655/37 Driver Side Seat Belt Buckle Switch Circuit Malfunction

  1. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.

  1. Turn the ignition switch on.

  1. Measure the voltage.

    Standard voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    J10-4 (LBE+) - Body ground
    		ignition switch ON
    		Below 1 V
    J10-3 (LBE-) - Body ground
    		ignition switch ON
    		Below 1 V


NG
REPAIR OR REPLACE FLOOR WIRE
OK


6.CHECK FLOOR WIRE (TO GROUND)
Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). Dtc B1655/37 Driver Side Seat Belt Buckle Switch Circuit Malfunction

  1. Turn the ignition switch off.

  1. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.

  1. Measure the resistance.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    J10-4 (LBE+) - Body ground
    		Always
    		1 MΩ or higher
    J10-3 (LBE-) - Body ground
    		Always
    		1 MΩ or higher


NG
REPAIR OR REPLACE FLOOR WIRE
OK


7.CHECK FRONT SEAT INNER BELT ASSEMBLY LH
Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). Dtc B1655/37 Driver Side Seat Belt Buckle Switch Circuit Malfunction

  1. Connect the connector to the center airbag sensor assembly and the front seat inner belt assembly LH.

  1. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.

  1. Turn the ignition switch on, and wait for at least 60 seconds.

  1. Clear the DTCs stored in the memory (YARIS_NCP93 RM000000XFE0D2X.html).

  1. Turn the ignition switch off.

  1. Turn the ignition switch on, and wait for at least 60 seconds.

  1. Check the DTCs (YARIS_NCP93 RM000000XFE0D2X.html).

    OK:
    DTC B1655/37 is not output.
    HINT:
    DTCs other than DTC B1655/37 may be output at this time, but they are not related to this check.


OK
USE SIMULATION METHOD TO CHECK
NG


8.REPLACE FRONT SEAT INNER BELT ASSEMBLY LH

  1. Turn the ignition switch off.

  1. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.

  1. Replace the front seat inner belt assembly LH (YARIS_NCP93 RM000002AQ700CX.html).

    HINT:
    Perform the inspection using parts from a normal vehicle if possible.

NEXT


9.CHECK CENTER AIRBAG SENSOR ASSEMBLY
Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). Dtc B1655/37 Driver Side Seat Belt Buckle Switch Circuit Malfunction

  1. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.

  1. Turn the ignition switch on, and wait for at least 60 seconds.

  1. Clear the DTCs stored in the memory (YARIS_NCP93 RM000000XFE0D2X.html).

  1. Turn the ignition switch off.

  1. Turn the ignition switch on, and wait for at least 60 seconds.

  1. Check the DTCs (YARIS_NCP93 RM000000XFE0D2X.html).

    OK:
    DTC B1655/37 is not output.
    HINT:
    DTCs other than DTC B1655/37 may be output at this time, but they are not related to this check.


NG
REPLACE CENTER AIRBAG SENSOR ASSEMBLY
OK

END