Dtc B1615/14 Front Airbag Sensor Lh Circuit Malfunction

Vehicle Interior. Yaris. Ncp93, 131
Supplemental Restraint Systems. Yaris. Ncp93, 131

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK DTC

CHECK CONNECTION OF CONNECTORS

CHECK FRONT AIRBAG SENSOR LH CIRCUIT (FOR OPEN)

CHECK FRONT AIRBAG SENSOR LH CIRCUIT (FOR 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 (FOR OPEN)

CHECK ENGINE ROOM MAIN WIRE (FOR SHORT)

CHECK ENGINE ROOM MAIN WIRE (TO B+)

CHECK ENGINE ROOM MAIN WIRE (TO GROUND)

DTC B1615/14 Front Airbag Sensor LH Circuit Malfunction


DESCRIPTION

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

DTC No.
DTC Detecting Condition
Trouble Area
B1615/14
  1. Center airbag sensor assembly detects line short circuit signal, open circuit signal, short circuit to ground signal or short circuit to B+ signal in front airbag sensor LH circuit for 2 seconds.
  2. Front airbag sensor LH malfunction
  3. Center airbag sensor assembly malfunction
  1. Instrument panel wire
  2. Engine room main wire
  3. Front airbag sensor LH
  4. Center airbag sensor assembly

WIRING DIAGRAM


Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). Dtc B1615/14 Front Airbag Sensor Lh Circuit Malfunction


INSPECTION PROCEDURE

NOTICE:
In order to prevent unexpected airbag deployment, disconnect the following connectors before inspecting parts such as wire harnesses, if the application of tester probes to the center airbag sensor assembly connector is necessary.
  1. Turn the ignition switch to the lock position.
  2. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
  3. Disconnect the connector from the center airbag sensor assembly.
  4. Disconnect the connectors from the steering pad.
  5. Disconnect the connectors from the front passenger airbag assembly.
  6. Disconnect the connector from the front seat outer belt assembly LH.
  7. Disconnect the connector from the front seat outer belt assembly RH.
    HINT:
    Skip the following steps if side and curtain shield airbags are not fitted.
  8. Disconnect the connector from the front seat side airbag assembly LH.
  9. Disconnect the connector from the front seat side airbag assembly RH.
  10. Disconnect the connector from the curtain shield airbag assembly LH.
  11. Disconnect the connector from the curtain shield airbag assembly RH.
1.CHECK DTC
Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). 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 the memory (YARIS_NCP93 RM000000XFE0D2X.html).

  1. Turn the ignition switch off.

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

  1. Check the DTCs (YARIS_NCP93 RM000000XFE0D2X.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 CONNECTORS

  1. Turn the ignition switch off.

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

  1. Check that the connectors are properly connected to the center airbag sensor assembly and the front airbag sensor LH.

    OK:
    The connectors are properly connected.


NG
CONNECT CONNECTORS
OK


3.CHECK FRONT AIRBAG SENSOR LH CIRCUIT (FOR OPEN)
Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). Dtc B1615/14 Front Airbag Sensor Lh Circuit Malfunction

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

  1. Using a service wire, connect A12-1 and A12-2 of connector E.

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

  1. Measure the resistance.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    D16-30 (+SL) - D16-28 (-SL)
    		Always
    		Below 1 Ω


NG
Go to step 8
OK


4.CHECK FRONT AIRBAG SENSOR LH CIRCUIT (FOR SHORT)
Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). Dtc B1615/14 Front Airbag Sensor Lh Circuit Malfunction

  1. Disconnect the service wire from connector E.

  1. Measure the resistance.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    D16-30 (+SL) - D16-28 (-SL)
    		Always
    		1 MΩ or higher


NG
Go to step 9
OK


5.CHECK FRONT AIRBAG SENSOR LH CIRCUIT (TO B+)
Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). Dtc B1615/14 Front Airbag Sensor Lh Circuit Malfunction

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

  1. Turn the ignition switch on.

  1. Measure the voltage.

    Standard voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D16-30 (+SL) - Body ground
    		Ignition switch on
    		Below 1 V
    D16-28 (-SL) - Body ground
    		Ignition switch on
    		Below 1 V


NG
Go to step 10
OK


6.CHECK FRONT AIRBAG SENSOR LH CIRCUIT (TO GROUND)
Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). Dtc B1615/14 Front Airbag Sensor Lh Circuit Malfunction

  1. Turn the ignition switch off.

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

  1. Measure the resistance.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    D16-30 (+SL) - Body ground
    		Always
    		1 MΩ or higher
    D16-28 (-SL) - Body ground
    		Always
    		1 MΩ or higher


NG
Go to step 11
OK


7.CHECK FRONT AIRBAG SENSOR LH
Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). Dtc B1615/14 Front Airbag Sensor Lh Circuit Malfunction

  1. Connect the connectors to the center airbag sensor assembly.

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

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

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

  1. Clear the DTCs stored in the memory (YARIS_NCP93 RM000000XFE0D2X.html).

  1. Turn the ignition switch off.

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

  1. Check the DTCs (YARIS_NCP93 RM000000XFE0D2X.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
    HINT:
    DTCs other than DTC B1610/13 and B1615/14 may be output at this time, but they are not related to this check.


A
REPLACE CENTER AIRBAG SENSOR ASSEMBLY

B
REPLACE FRONT AIRBAG SENSOR LH
C

USE SIMULATION METHOD TO CHECK

8.CHECK ENGINE ROOM MAIN WIRE (FOR OPEN)
Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). Dtc B1615/14 Front Airbag Sensor Lh Circuit Malfunction

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

    HINT:
    The service wire has already been inserted into connector E.

  1. Measure the resistance.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    AD1-3 (+SL) - AD1-4 (-SL)
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE ENGINE ROOM MAIN WIRE
OK

REPAIR OR REPLACE INSTRUMENT PANEL WIRE

9.CHECK ENGINE ROOM MAIN WIRE (FOR SHORT)
Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). Dtc B1615/14 Front Airbag Sensor Lh Circuit Malfunction

  1. Disconnect the service wire from connector E.

  1. Measure the resistance.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    AD1-3 (+SL) - AD1-4 (-SL)
    		Always
    		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+)
Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). Dtc B1615/14 Front Airbag Sensor Lh Circuit Malfunction

  1. Turn the ignition switch to the lock position.

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

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

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

  1. Turn the ignition switch on.

  1. Measure the voltage.

    Standard voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    AD1-3 (+SL) - Body ground
    		Ignition switch on
    		Below 1 V
    AD1-4 (-SL) - Body ground
    		Ignition switch on
    		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)
Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). 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.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    AD1-3 (+SL) - Body ground
    		Always
    		1 MΩ or higher
    AD1-4 (-SL) - Body ground
    		Always
    		1 MΩ or higher


NG
REPAIR OR REPLACE ENGINE ROOM MAIN WIRE
OK

REPAIR OR REPLACE INSTRUMENT PANEL WIRE