Dtc B1615/14 Front Airbag Sensor Lh Circuit Malfunction


SYSTEM DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK FOR DTC

CHECK CONNECTION OF CONNECTOR

CHECK FRONT AIRBAG SENSOR LH CIRCUIT (OPEN)

CHECK FRONT AIRBAG SENSOR LH CIRCUIT (SHORT)

CHECK FRONT AIRBAG SENSOR LH CIRCUIT (TO B+)

CHECK FRONT AIRBAG SENSOR LH CIRCUIT (TO GROUND)

CHECK FRONT AIRBAG SENSOR LH

CHECK ENGINE ROOM MAIN WIRE (OPEN)

CHECK ENGINE ROOM MAIN WIRE (SHORT)

CHECK ENGINE ROOM MAIN WIRE (TO B+)

CHECK ENGINE ROOM MAIN WIRE (TO GROUND)

DTC B1615/14 Front Airbag Sensor LH Circuit Malfunction


SYSTEM DESCRIPTION

The front airbag sensor LH consists of the diagnostic circuit and front deceleration sensor. The center airbag sensor receives signals from the front deceleration sensor, and determines whether or not the SRS should be activated. DTC B1615/14 is recorded when a malfunction is detected in the front airbag sensor LH circuit.

DTC No.
DTC Detection Condition
Trouble Area
B1615/14
When one of following conditions is met:
  1. Center airbag sensor receives line short signal, open signal, short to ground signal or B+ short signal in front airbag sensor LH circuit for 2 seconds
  2. Front airbag sensor LH malfunction
  3. Center airbag sensor malfunction
  1. Front airbag sensor LH
  2. Center airbag sensor assembly
  3. Instrument panel wire
  4. Engine room main wire

WIRING DIAGRAM


Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Supplemental Restraint System.Airbag System. Dtc B1615/14 Front Airbag Sensor Lh Circuit Malfunction


INSPECTION PROCEDURE

1.CHECK FOR DTC
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Supplemental Restraint System.Airbag System. Dtc B1615/14 Front Airbag Sensor Lh Circuit Malfunction

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

  1. Clear the DTCs stored in memory (Toyota Fortuner RM000000YVY004X.html).

  1. Turn the ignition switch OFF.

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

  1. Check for DTCs (Toyota Fortuner RM000000YVY004X.html).

    OK:
    DTC B1615/14 is not output.
    HINT:
    DTCs other than DTC B1615/14 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 CONNECTOR

  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 front airbag sensor LH.

    OK:
    Connectors are connected.


NG
CONNECT CONNECTOR
OK


3.CHECK FRONT AIRBAG SENSOR LH CIRCUIT (OPEN)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Supplemental Restraint System.Airbag System. Dtc B1615/14 Front Airbag Sensor Lh Circuit Malfunction

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

  1. Using a service wire, connect terminals A24-28 (-SL) and A24-30 (+SL) of connector B.

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

  1. Measure the resistance of the wire harness side connector.

    Standard resistance:
    Tester Connection
    		Specified Condition
    A10-2 (+SL) - A10-1 (-SL)
    		Below 1 Ω


NG
Go to step 8
OK


4.CHECK FRONT AIRBAG SENSOR LH CIRCUIT (SHORT)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Supplemental Restraint System.Airbag System. Dtc B1615/14 Front Airbag Sensor Lh Circuit Malfunction

  1. Disconnect the service wire from connector B.

  1. Measure the resistance of the wire harness side connector.

    Standard resistance:
    Tester Connection
    		Specified Condition
    A10-2 (+SL) - A10-1 (-SL)
    		1 MΩ or higher


NG
Go to step 9
OK


5.CHECK FRONT AIRBAG SENSOR LH CIRCUIT (TO B+)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Supplemental Restraint System.Airbag System. Dtc B1615/14 Front Airbag Sensor Lh Circuit Malfunction

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

  1. Turn the ignition switch ON.

  1. Measure the voltage of the wire harness side connector.

    Standard voltage:
    Tester Connection
    		Specified Condition
    A10-2 (+SL) - Body ground
    		Below 1 V
    A10-1 (-SL) - Body ground
    		Below 1 V


NG
Go to step 10
OK


6.CHECK FRONT AIRBAG SENSOR LH CIRCUIT (TO GROUND)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Supplemental Restraint System.Airbag System. Dtc B1615/14 Front Airbag Sensor Lh 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. Measure the resistance of the wire harness side connector.

    Standard resistance:
    Tester Connection
    		Specified Condition
    A10-2 (+SL) - Body ground
    		1 MΩ or higher
    A10-1 (-SL) - Body ground
    		1 MΩ or higher


NG
Go to step 11
OK


7.CHECK FRONT AIRBAG SENSOR LH
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Supplemental Restraint System.Airbag System. Dtc B1615/14 Front Airbag Sensor Lh Circuit Malfunction

  1. Connect the connector to the center airbag sensor.

  1. Interchange the front airbag sensor LH with the front airbag sensor 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 ON, and wait for at least 60 seconds.

  1. Clear the DTCs (Toyota Fortuner RM000000YVY004X.html).

  1. Turn the ignition switch OFF.

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

  1. Check for DTCs (Toyota Fortuner RM000000YVY004X.html).

    Result
    Result
    		Proceed to
    DTC B1615/14 is output
    		A
    DTC B1610/13 is output
    		B
    DTC B1610/13 and B1615/14 are not output
    		C


A
REPLACE CENTER AIRBAG SENSOR ASSEMBLY

B
REPLACE FRONT AIRBAG SENSOR LH
C

USE SIMULATION METHOD TO CHECK

8.CHECK ENGINE ROOM MAIN WIRE (OPEN)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Supplemental Restraint System.Airbag System. Dtc B1615/14 Front Airbag Sensor Lh Circuit Malfunction

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

  1. Using a service wire, connect terminals A10-1 (-SL) and A10-2 (+SL) of connector E.

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

  1. Measure the resistance of the wire harness side connector.

    Standard resistance:
    Tester Connection
    		Specified Condition
    II1-3 (+SL) - II1-4 (-SL)
    		Below 1 Ω


NG
REPAIR OR REPLACE ENGINE ROOM MAIN WIRE
OK

REPAIR OR REPLACE INSTRUMENT PANEL WIRE

9.CHECK ENGINE ROOM MAIN WIRE (SHORT)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Supplemental Restraint System.Airbag System. Dtc B1615/14 Front Airbag Sensor Lh Circuit Malfunction

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

  1. Measure the resistance of the wire harness side connector.

    Standard resistance:
    Tester Connection
    		Specified Condition
    II1-3 (+SL) - II1-4 (-SL)
    		1 MΩ or higher


NG
REPAIR OR REPLACE ENGINE ROOM MAIN WIRE
OK

REPAIR OR REPLACE INSTRUMENT PANEL WIRE

10.CHECK ENGINE ROOM MAIN WIRE (TO B+)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Supplemental Restraint System.Airbag System. Dtc B1615/14 Front Airbag Sensor Lh 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. Disconnect the engine room main wire connector from the instrument panel wire.

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

  1. Turn the ignition switch ON.

  1. Measure the voltage of the wire harness side connector.

    Standard voltage:
    Tester Connection
    		Specified Condition
    II1-3 (+SL) - Body ground
    		Below 1 V
    II1-4 (-SL) - Body ground
    		Below 1 V


NG
REPAIR OR REPLACE ENGINE ROOM MAIN WIRE
OK

REPAIR OR REPLACE INSTRUMENT PANEL WIRE

11.CHECK ENGINE ROOM MAIN WIRE (TO GROUND)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Supplemental Restraint System.Airbag System. Dtc B1615/14 Front Airbag Sensor Lh Circuit Malfunction

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

  1. Measure the resistance of the wire harness side connector.

    Standard resistance:
    Tester Connection
    		Specified Condition
    II1-3 (+SL) - Body ground
    		1 MΩ or higher
    II1-4 (-SL) - Body ground
    		1 MΩ or higher


NG
REPAIR OR REPLACE ENGINE ROOM MAIN WIRE
OK

REPAIR OR REPLACE INSTRUMENT PANEL WIRE