Dtc B1617/84 Lost Communication With Front Airbag Sensor Lh

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 FRONT AIRBAG SENSOR LH CIRCUIT

CHECK FRONT AIRBAG SENSOR LH

CHECK INSTRUMENT PANEL WIRE (CENTER AIRBAG SENSOR - ENGINE ROOM MAIN WIRE)

DTC B1617/84 Lost Communication with Front Airbag Sensor LH

DTC B1618/84 Front Airbag Sensor LH Initialization Incomplete


DESCRIPTION

The front airbag sensor LH circuit consists of the center airbag sensor and front airbag sensor LH.
The front airbag sensor LH detects impacts to the vehicle and sends signals to the center airbag sensor to determine if the airbag should be deployed.
DTC B1617/84 or B1618/84 is stored when a malfunction is detected in the front airbag sensor LH circuit.

DTC Code
DTC Detection Condition
Trouble Area
B1617/84
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 front airbag sensor LH circuit for 2 seconds.
  2. A front airbag sensor LH malfunction.
  3. A center airbag sensor malfunction.
  1. Instrument panel wire
  2. Engine room main wire
  3. Front airbag sensor LH
  4. Center airbag sensor assembly
B1618/84
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 front airbag sensor LH circuit for 2 seconds.
  2. A front airbag sensor LH malfunction.
  3. A center airbag sensor malfunction.
  1. Instrument panel wire
  2. Engine room main wire
  3. Front airbag sensor LH
  4. Center airbag sensor assembly

WIRING DIAGRAM


Land Cruiser. Urj200, 202 Grj200 Vdj200.Supplemental Restraint Systems.Airbag System. Dtc B1617/84 Lost Communication With Front Airbag Sensor Lh


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 front airbag sensor LH.

    OK:
    The connectors are properly connected.


NG
CONNECT CONNECTORS PROPERLY
OK


2.CHECK CONNECTORS

  1. Disconnect the connectors from the center airbag sensor and front airbag sensor LH.

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

    OK:
    The connectors are not deformed or damaged.


NG
REPLACE HARNESS AND CONNECTOR
OK


3.CHECK FRONT AIRBAG SENSOR LH 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 B1617/84 Lost Communication With Front Airbag Sensor Lh

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A7-2 (+SL) - Body ground
    		Ignition switch ON
    		Below 1 V
    A7-1 (-SL) - 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 30 (+SL) and 28 (-SL) 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
    A7-2 (+SL) - A7-1 (-SL)
    		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
    A7-2 (+SL) - A7-1 (-SL)
    		Always
    		1 MΩ or higher
    A7-2 (+SL) - Body ground
    		Always
    		1 MΩ or higher
    A7-1 (-SL) - Body ground
    		Always
    		1 MΩ or higher


NG
Go to step 5
OK


4.CHECK FRONT AIRBAG SENSOR LH


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Supplemental Restraint Systems.Airbag System. Dtc B1617/84 Lost Communication With Front Airbag Sensor Lh

  1. Connect the connectors to the center airbag sensor.

  1. Interchange the front airbag sensor LH with RH and connect the connectors to them.

  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).

    Result
    Result
    		Proceed to
    DTC B1617 or B1618 is output
    		A
    DTC B1612 or B1613 is output
    		B
    DTC B1612, B1613, B1617 and B1618 are not output
    		C
    HINT:
    Codes other than DTC B1612, B1613, B1617 and B1618 may be output at this time, but they are not related to this check.


A
REPLACE CENTER AIRBAG SENSOR ASSEMBLY (Click here)

B
REPLACE FRONT AIRBAG SENSOR LH (Click here)
C

USE SIMULATION METHOD TO CHECK (Click here)

5.CHECK INSTRUMENT PANEL WIRE (CENTER AIRBAG SENSOR - ENGINE ROOM MAIN WIRE)


  1. Disconnect the instrument panel wire connector from the engine room main wire.


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Supplemental Restraint Systems.Airbag System. Dtc B1617/84 Lost Communication With Front Airbag Sensor Lh

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

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    AE1-2 (+SL) - Body ground
    		Ignition switch ON
    		Below 1 V
    AE1-1 (-SL) - 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 30 (+SL) and 28 (-SL) 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
    AE1-2 (+SL) - AE1-1 (-SL)
    		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
    AE1-2 (+SL) - AE1-1 (-SL)
    		Always
    		1 MΩ or higher
    AE1-2 (+SL) - Body ground
    		Always
    		1 MΩ or higher
    AE1-1 (-SL) - Body ground
    		Always
    		1 MΩ or higher


NG
REPLACE INSTRUMENT PANEL WIRE
OK

REPLACE ENGINE ROOM MAIN WIRE