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

Land Cruiser URJ200 URJ202 GRJ200 VDJ200 - SUPPLEMENTAL RESTRAINT SYSTEMS

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.
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 CodeDTC Detection ConditionTrouble Area
B1676/85When one of the following conditions is met:
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.
A rear floor airbag sensor malfunction.
A center airbag sensor malfunction.
No. 2 floor wire
Rear floor airbag sensor
Center airbag sensor assembly
B1677/85When one of the following conditions is met:
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.
A rear floor airbag sensor malfunction.
A center airbag sensor malfunction.
No. 2 floor wire
Rear floor airbag sensor
Center airbag sensor assembly

WIRING DIAGRAM

Dtc B1676/85 Lost Communication With Rear Floor Airbag Sensor Rh. SUPPLEMENTAL RESTRAINT SYSTEMS. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

INSPECTION PROCEDURE

  • NOTICE:
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 ().
When disconnecting the cable, some systems need to be initialized after the cable is reconnected ().
1.CHECK CONNECTION OF CONNECTORS

Turn the ignition switch off.

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

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

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

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

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

Dtc B1676/85 Lost Communication With Rear Floor Airbag Sensor Rh. SUPPLEMENTAL RESTRAINT SYSTEMS. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

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

  • Standard Voltage:
  • Tester ConnectionSwitch ConditionSpecified Condition
    L19-2 (BER+) - Body groundIgnition switch ONBelow 1 V
    L19-1 (BER-) - Body groundIgnition switch ONBelow 1 V

Turn the ignition switch off.

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

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.

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

  • Standard Resistance:
  • Tester ConnectionConditionSpecified Condition
    L19-2 (BER+) - L19-1 (BER-)AlwaysBelow 1 Ω

Disconnect the service wire from connector B.

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

  • Standard Resistance:
  • Tester ConnectionConditionSpecified Condition
    L19-2 (BER+) - L19-1 (BER-)Always1 MΩ or higher
    L19-2 (BER+) - Body groundAlways1 MΩ or higher
    L19-1 (BER-) - Body groundAlways1 MΩ or higher
NG
REPLACE NO. 2 FLOOR WIRE
OK
4.CHECK REAR FLOOR AIRBAG SENSOR
Dtc B1676/85 Lost Communication With Rear Floor Airbag Sensor Rh. SUPPLEMENTAL RESTRAINT SYSTEMS. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

Connect the connectors to the center airbag sensor.

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

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

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

Clear the DTCs stored in the memory ().

Turn the ignition switch off.

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


Check for DTCs ().

  • 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 ()
B
REPLACE REAR FLOOR AIRBAG SENSOR ()
C
REPLACE CENTER AIRBAG SENSOR ASSEMBLY ()