Dtc B1676/85 Lost Communication With Rear Floor Airbag Sensor Rh

Vehicle Interior. Land Cruiser. Urj200, 202 Grj200 Vdj200
Supplemental Restraint Systems. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK CONNECTION OF CONNECTORS

CHECK CONNECTORS

CHECK REAR FLOOR AIRBAG SENSOR CIRCUIT

CHECK REAR FLOOR AIRBAG SENSOR

DTC B1676/85 Lost Communication with Rear Floor Airbag Sensor RH

DTC B1677/85 Rear Floor Airbag Sensor RH Initialization Incomplete


DESCRIPTION

HINT:
"Rear floor airbag sensor RH" refer to the rear floor airbag sensor.
  1. The rear floor airbag sensor circuit consists of the center airbag sensor and rear floor airbag sensor.
    The rear floor airbag sensor detects impacts to the vehicle and sends signals to the center airbag sensor to determine if the airbag should be deployed.
    DTC B1676/85 or B1677/85 is stored when a malfunction is detected in the rear floor airbag sensor circuit.

DTC Code
DTC Detection Condition
Trouble Area
B1676/85
When one of the following conditions is met:
  1. The center airbag sensor receives a line short circuit signal, an open circuit signal, a short circuit to ground signal or a short circuit to B+ signal in the rear floor airbag sensor circuit for 2 seconds.
  2. A rear floor airbag sensor malfunction.
  3. A center airbag sensor malfunction.
  1. No. 2 floor wire
  2. Rear floor airbag sensor
  3. Center airbag sensor assembly
B1677/85
When one of the following conditions is met:
  1. The center airbag sensor receives a line short circuit signal, an open circuit signal, a short circuit to ground signal or a short circuit to B+ signal in the rear floor airbag sensor circuit for 2 seconds.
  2. A rear floor airbag sensor malfunction.
  3. A center airbag sensor malfunction.
  1. No. 2 floor wire
  2. Rear floor airbag sensor
  3. Center airbag sensor assembly

WIRING DIAGRAM


Land Cruiser. Urj200, 202 Grj200 Vdj200.Supplemental Restraint Systems.Airbag System. Dtc B1676/85 Lost Communication With Rear Floor Airbag Sensor Rh


INSPECTION PROCEDURE

NOTICE:
  1. After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work (Click here).
  2. When disconnecting the cable, some systems need to be initialized after the cable is reconnected (Click here).
1.CHECK CONNECTION OF CONNECTORS

  1. Turn the ignition switch off.

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

  1. Check that the connectors are properly connected to the center airbag sensor and the rear floor airbag sensor.

    OK:
    The connectors are properly connected.


NG
CONNECT CONNECTORS PROPERLY
OK


2.CHECK CONNECTORS

  1. Disconnect the connectors from the center airbag sensor and rear floor airbag sensor.

  1. Check that the connectors (on the center airbag sensor side and rear floor airbag sensor side) are not damaged.

    OK:
    The connectors are not deformed or damaged.


NG
REPLACE HARNESS AND CONNECTOR
OK


3.CHECK REAR FLOOR AIRBAG SENSOR CIRCUIT


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


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Supplemental Restraint Systems.Airbag System. Dtc B1676/85 Lost Communication With Rear Floor Airbag Sensor Rh

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    L19-2 (BER+) - Body ground
    		Ignition switch ON
    		Below 1 V
    L19-1 (BER-) - Body ground
    		Ignition switch ON
    		Below 1 V

  1. Turn the ignition switch off.

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

  1. Using a service wire, connect terminals 21 (BDR+) and 22 (BDR-) of connector B.

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

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    L19-2 (BER+) - L19-1 (BER-)
    		Always
    		Below 1 Ω

  1. Disconnect the service wire from connector B.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    L19-2 (BER+) - L19-1 (BER-)
    		Always
    		1 MΩ or higher
    L19-2 (BER+) - Body ground
    		Always
    		1 MΩ or higher
    L19-1 (BER-) - Body ground
    		Always
    		1 MΩ or higher


NG
REPLACE NO. 2 FLOOR WIRE
OK


4.CHECK REAR FLOOR AIRBAG SENSOR


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Supplemental Restraint Systems.Airbag System. Dtc B1676/85 Lost Communication With Rear Floor Airbag Sensor Rh

  1. Connect the connectors to the center airbag sensor.

  1. Temporarily replace the rear floor airbag sensor with a new one.

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

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

  1. Clear the DTCs stored in the memory (Click here).

  1. Turn the ignition switch off.

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

    1. Check for DTCs (Click here).

      OK:
      DTC B1676 and B1677are not output.
      HINT:
      Codes other than DTC B1676 and B1677 may be output at this time, but they are not related to this check.


A
USE SIMULATION METHOD TO CHECK (Click here)

B
REPLACE REAR FLOOR AIRBAG SENSOR (Click here)
C

REPLACE CENTER AIRBAG SENSOR ASSEMBLY (Click here)