Dtc B1660/43 Passenger Airbag Off Indicator Circuit Malfunction


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK PASSENGER AIRBAG CUTOFF INDICATOR CONDITION

CHECK CONNECTION OF CONNECTORS

CHECK CONNECTORS

CHECK PASSENGER AIRBAG CUTOFF INDICATOR

CHECK CENTER AIRBAG SENSOR

CHECK INSTRUMENT PANEL WIRE (CENTER AIRBAG SENSOR - TELLTALE LIGHT)

CHECK CONNECTION OF CONNECTORS

CHECK CONNECTORS

CHECK INSTRUMENT PANEL WIRE (CENTER AIRBAG SENSOR - TELLTALE LIGHT)

CHECK PASSENGER AIRBAG CUTOFF INDICATOR (SOURCE VOLTAGE)

CHECK PASSENGER AIRBAG CUTOFF INDICATOR

CHECK CENTER AIRBAG SENSOR

DTC B1660/43 Passenger Airbag OFF Indicator Circuit Malfunction


DESCRIPTION

The airbag cutoff indicator circuit consists of the center airbag sensor and the airbag cutoff indicator.
The airbag cutoff indicator indicates the operation condition of the instrument panel passenger airbag, front seat side airbag and front seat outer belt.
DTC B1660/43 is stored when a malfunction is detected in the airbag cutoff indicator circuit.

DTC Code
DTC Detection Condition
Trouble Area
B1660/43
One of the following conditions is met:
  1. The center airbag sensor detects open circuit signal, short circuit to ground signal or short circuit to B+ signal in the airbag cutoff indicator circuit for 2 seconds.
  2. A airbag cutoff indicator malfunction.
  3. A center airbag sensor malfunction.
  1. Instrument panel wire
  2. Telltale light assembly
  3. Center airbag sensor assembly

WIRING DIAGRAM


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Supplemental Restraint Systems.Airbag System. Dtc B1660/43 Passenger Airbag Off Indicator Circuit Malfunction


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 (LandCruiser RM000003YMD00TX.html).
  2. When disconnecting the cable from the negative (-) battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected (LandCruiser RM000003YMF011X.html).
1.CHECK PASSENGER AIRBAG CUTOFF INDICATOR CONDITION


  1. Turn the ignition switch to ON.


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Supplemental Restraint Systems.Airbag System. Dtc B1660/43 Passenger Airbag Off Indicator Circuit Malfunction

  1. Check the airbag cutoff indicator operation.

    HINT:
    Refer to the normal condition of the airbag cutoff indicator (LandCruiser RM000000XFD0N3X.html).
    Result
    Result
    		Proceed to
    Always on
    		A
    Off
    		B


B
Go to step 7
A


2.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 telltale light.

    OK:
    The connectors are properly connected.


NG
CONNECT CONNECTORS PROPERLY
OK


3.CHECK CONNECTORS

  1. Disconnect the connectors from the center airbag sensor and telltale light.



    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Supplemental Restraint Systems.Airbag System. Dtc B1660/43 Passenger Airbag Off Indicator Circuit Malfunction

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

    OK:
    The connectors are not deformed or damaged.
    Text in Illustration
    *1
    		Telltale Light
    *2
    		Center Airbag Sensor


NG
REPLACE INSTRUMENT PANEL WIRE
OK


4.CHECK PASSENGER AIRBAG CUTOFF INDICATOR


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155

  1. Connect the connector to the telltale light.

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

  1. Turn the ignition switch to ON.

  1. Check the airbag cutoff indicator operation.

    OK:
    The airbag cutoff indicator does not come on.


NG
Go to step 6
OK


5.CHECK CENTER AIRBAG SENSOR


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Supplemental Restraint Systems.Airbag System. Dtc B1660/43 Passenger Airbag Off Indicator Circuit Malfunction

  1. Connect the connectors to the center airbag sensor.

  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 (LandCruiser RM000000XFE0NGX.html).

  1. Turn the ignition switch off.

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

  1. Check for DTCs (LandCruiser RM000000XFE0NGX.html).

    OK:
    DTC B1660 is not output.
    HINT:
    Codes other than DTC B1660 may be output at this time, but they are not related to this check.
    Text in Illustration
    *1
    		Telltale Light
    *2
    		Center Airbag Sensor


NG
REPLACE CENTER AIRBAG SENSOR ASSEMBLY (LandCruiser RM000003YQB01BX.html)
OK

USE SIMULATION METHOD TO CHECK (LandCruiser RM000000XFD0N3X.html)

6.CHECK INSTRUMENT PANEL WIRE (CENTER AIRBAG SENSOR - TELLTALE LIGHT)


  1. Turn the ignition switch off.


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Supplemental Restraint Systems.Airbag System. Dtc B1660/43 Passenger Airbag Off Indicator Circuit Malfunction


    Text in Illustration
    *1
    		Telltale Light
    		*2
    		Center Airbag Sensor
    *3
    		Connector C
    		*4
    		Connector B
    *5
    		Service Wire
    		-
    		-
    *a
    		Front view of wire harness connector
    (to Telltale Light)
    		*b
    		Rear view of wire harness connector
    (to Center Airbag Sensor)

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

  1. Disconnect the connectors from the center airbag sensor and telltale light.

  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
    G5-7 (OFF) - 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. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    G5-7 (OFF) - G1-17 (P-AB)
    		Always
    		Below 1 Ω
    G5-7 (OFF) - Body ground
    		Always
    		1 MΩ or higher


NG
REPLACE INSTRUMENT PANEL WIRE
OK

REPLACE TELLTALE LIGHT ASSEMBLY (LandCruiser RM000003YR001IX.html)

7.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 telltale light.

    OK:
    The connectors are properly connected.


NG
CONNECT CONNECTORS PROPERLY
OK


8.CHECK CONNECTORS

  1. Disconnect the connectors from the center airbag sensor and telltale light.



    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Supplemental Restraint Systems.Airbag System. Dtc B1660/43 Passenger Airbag Off Indicator Circuit Malfunction

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

    OK:
    The connectors are not deformed or damaged.
    Text in Illustration
    *1
    		Telltale Light
    *2
    		Center Airbag Sensor


NG
REPLACE INSTRUMENT PANEL WIRE
OK


9.CHECK INSTRUMENT PANEL WIRE (CENTER AIRBAG SENSOR - TELLTALE LIGHT)


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


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Supplemental Restraint Systems.Airbag System. Dtc B1660/43 Passenger Airbag Off Indicator Circuit Malfunction


    Text in Illustration
    *1
    		Telltale Light
    		*2
    		Center Airbag Sensor
    *3
    		Connector C
    		*4
    		Connector B
    *5
    		Service Wire
    		-
    		-
    *a
    		Front view of wire harness connector
    (to Telltale Light)
    		*b
    		Rear view of wire harness connector
    (to Center Airbag Sensor)

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    G5-7 (OFF) - 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. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    G5-7 (OFF) - G1-17 (P-AB)
    		Always
    		Below 1 Ω
    G5-7 (OFF) - Body ground
    		Always
    		1 MΩ or higher


NG
REPLACE INSTRUMENT PANEL WIRE
OK


10.CHECK PASSENGER AIRBAG CUTOFF INDICATOR (SOURCE VOLTAGE)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Supplemental Restraint Systems.Airbag System. Dtc B1660/43 Passenger Airbag Off Indicator Circuit Malfunction

  1. Turn the ignition switch off.

  1. Connect the connectors to the center airbag sensor.

  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
    G5-5 (LAPB) - Body ground
    		Ignition switch ON
    		11 to 14 V
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Telltale Light)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (TELLTALE LIGHT - BATTERY) OR BATTERY
OK


11.CHECK PASSENGER AIRBAG CUTOFF INDICATOR


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Supplemental Restraint Systems.Airbag System. Dtc B1660/43 Passenger Airbag Off Indicator Circuit Malfunction

  1. Turn the ignition switch off.

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

  1. Connect the connector to the telltale light.

  1. Disconnect the connectors from the center airbag sensor.

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

  1. Check the indicator according to the value(s) in the table below.

    OK:
    Tester Connection
    		Switch Condition
    		Airbag Cutoff Indicator
    G1-17 (P-AB) - Body ground
    		Ignition switch ON
    		Indicator comes on
    Text in Illustration
    *a
    		Rear view of wire harness connector
    (to Center Airbag Sensor)


NG
REPLACE TELLTALE LIGHT ASSEMBLY (LandCruiser RM000003YR001IX.html)
OK


12.CHECK CENTER AIRBAG SENSOR


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Supplemental Restraint Systems.Airbag System. Dtc B1660/43 Passenger Airbag Off Indicator Circuit Malfunction

  1. Turn the ignition switch off.

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

  1. Connect the connectors to the center airbag sensor.

  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 (LandCruiser RM000000XFE0NGX.html).

  1. Turn the ignition switch off.

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

  1. Check for DTCs (LandCruiser RM000000XFE0NGX.html).

    OK:
    DTC B1660 is not output.
    HINT:
    Codes other than DTC B1660 may be output at this time, but they are not related to this check.
    Text in Illustration
    *1
    		Telltale Light
    *2
    		Center Airbag Sensor


NG
REPLACE CENTER AIRBAG SENSOR ASSEMBLY (LandCruiser RM000003YQB01BX.html)
OK

USE SIMULATION METHOD TO CHECK (LandCruiser RM000000XFD0N3X.html)