Dtc B1615/14 Front Airbag Sensor Lh Circuit Malfunction

Vehicle Interior. Corolla. Zre142 Aze141
Supplemental Restraint Systems. Corolla. Zre142 Aze141

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK CONNECTORS

CHECK FRONT AIRBAG SENSOR LH CIRCUIT (OPEN)

CHECK FRONT AIRBAG SENSOR LH CIRCUIT (SHORT)

CHECK FRONT AIRBAG SENSOR LH CIRCUIT (SHORT TO B+)

CHECK FRONT AIRBAG SENSOR LH CIRCUIT (SHORT TO GROUND)

CHECK FRONT AIRBAG SENSOR LH

CHECK INSTRUMENT PANEL WIRE (OPEN)

CHECK INSTRUMENT PANEL WIRE (SHORT)

CHECK INSTRUMENT PANEL WIRE (SHORT TO B+)

CHECK INSTRUMENT PANEL WIRE (SHORT TO GROUND)

DTC B1615/14 Front Airbag Sensor LH Circuit Malfunction


DESCRIPTION

The front airbag sensor LH circuit consists of the center airbag sensor assembly and front airbag sensor LH.
The front airbag sensor LH detects impacts to the vehicle and sends signals to the center airbag sensor assembly to determine if the airbag should be deployed.
DTC B1615/14 is recorded when a malfunction is detected in the front airbag sensor LH circuit.

DTC No.
DTC Detecting Condition
Trouble Area
B1615/14
  1. The center airbag sensor assembly receives a 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. 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


Corolla. Zre142 Aze141.Supplemental Restraint Systems.Airbag System. Dtc B1615/14 Front Airbag Sensor Lh Circuit Malfunction


INSPECTION PROCEDURE

1.CHECK 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 assembly and the front airbag sensor LH. Also check that the connectors that link the engine room main wire and instrument panel wire are properly connected.

    OK:
    The connectors are properly connected.
    HINT:
    If the connectors are not connected securely, reconnect the connectors and proceed to the next inspection.

  1. Disconnect the connectors from the center airbag sensor assembly and the front airbag sensor LH. Also disconnect the connectors that link the engine room main wire and instrument panel wire.

  1. Check that the terminals of the connectors are not damaged.

    OK:
    The terminals are not deformed or damaged.


NG
REPLACE WIRE HARNESS
OK


2.CHECK FRONT AIRBAG SENSOR LH CIRCUIT (OPEN)


    Corolla. Zre142 Aze141.Supplemental Restraint Systems.Airbag System. Dtc B1615/14 Front Airbag Sensor Lh Circuit Malfunction

  1. Connect the connectors that link the engine room main wire and instrument panel wire.

  1. Using SST, connect connectors 30 (+SL) and 28 (-SL) of connector B.

    NOTICE:
    Do not forcibly insert SST into the terminals of the connector when connecting.
SST
09843-18040

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

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


NG
Go to step 7
OK


3.CHECK FRONT AIRBAG SENSOR LH CIRCUIT (SHORT)


    Corolla. Zre142 Aze141.Supplemental Restraint Systems.Airbag System. Dtc B1615/14 Front Airbag Sensor Lh Circuit Malfunction

  1. Disconnect SST from connector B.

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

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


NG
Go to step 8
OK


4.CHECK FRONT AIRBAG SENSOR LH CIRCUIT (SHORT TO B+)


    Corolla. Zre142 Aze141.Supplemental Restraint Systems.Airbag System. Dtc B1615/14 Front Airbag Sensor Lh Circuit Malfunction

  1. Connect the cable to the negative (-) battery terminal.

  1. Turn the ignition switch to ON.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A10-2 (+SL) - Body ground
    		Ignition switch ON
    		Below 1 V
    A10-1 (-SL) - Body ground
    		Ignition switch ON
    		Below 1 V


NG
Go to step 9
OK


5.CHECK FRONT AIRBAG SENSOR LH CIRCUIT (SHORT TO GROUND)


    Corolla. Zre142 Aze141.Supplemental Restraint Systems.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 according to the value(s) in the table below.

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


NG
Go to step 10
OK


6.CHECK FRONT AIRBAG SENSOR LH


    Corolla. Zre142 Aze141.Supplemental Restraint Systems.Airbag System. Dtc B1615/14 Front Airbag Sensor Lh Circuit Malfunction

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

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

  1. Connect the cable to the negative (-) battery terminal.

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

  1. Clear the DTCs stored in the memory (COROLLA_ZRE142 RM000000XFE0H1X.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 (COROLLA_ZRE142 RM000000XFE0H1X.html).

    Result:
    Result
    		Proceed to
    DTC B1610/13 and B1615/14 are not output.
    		A
    DTC B1610/13 is output.
    		B
    DTC B1615/14 is output.
    		C
    HINT:
    Codes other than DTC B1610/13 and B1615/14 may be output at this time, but they are not related to this check.


B
REPLACE FRONT AIRBAG SENSOR LH (COROLLA_ZRE142 RM000000UWZ097X.html)

C
REPLACE CENTER AIRBAG SENSOR ASSEMBLY (COROLLA_ZRE142 RM000000UWV074X.html)
A

USE SIMULATION METHOD TO CHECK (COROLLA_ZRE142 RM000000XFD0GSX.html)

7.CHECK INSTRUMENT PANEL WIRE (OPEN)


    Corolla. Zre142 Aze141.Supplemental Restraint Systems.Airbag System. Dtc B1615/14 Front Airbag Sensor Lh Circuit Malfunction

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

    HINT:
    SST has already been inserted into connector B.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    AE4-1 (+SL) - AE4-2 (-SL)
    		Always
    		Below 1 Ω


NG
REPLACE INSTRUMENT PANEL WIRE
OK

REPLACE ENGINE ROOM MAIN WIRE

8.CHECK INSTRUMENT PANEL WIRE (SHORT)


    Corolla. Zre142 Aze141.Supplemental Restraint Systems.Airbag System. Dtc B1615/14 Front Airbag Sensor Lh Circuit Malfunction

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

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    AE4-1 (+SL) - AE4-2 (-SL)
    		Always
    		1 MΩ or higher


NG
REPLACE INSTRUMENT PANEL WIRE
OK

REPLACE ENGINE ROOM MAIN WIRE

9.CHECK INSTRUMENT PANEL WIRE (SHORT TO B+)


    Corolla. Zre142 Aze141.Supplemental Restraint Systems.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 instrument panel wire connector from the engine room main wire.

  1. Connect the cable to the negative (-) battery terminal.

  1. Turn the ignition switch to ON.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    AE4-1 (+SL) - Body ground
    		Ignition switch ON
    		Below 1 V
    AE4-2 (-SL) - Body ground
    		Ignition switch ON
    		Below 1 V


NG
REPLACE INSTRUMENT PANEL WIRE
OK

REPLACE ENGINE ROOM MAIN WIRE

10.CHECK INSTRUMENT PANEL WIRE (SHORT TO GROUND)


    Corolla. Zre142 Aze141.Supplemental Restraint Systems.Airbag System. Dtc B1615/14 Front Airbag Sensor Lh Circuit Malfunction

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

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    AE4-1 (+SL) - Body ground
    		Always
    		1 MΩ or higher
    AE4-2 (-SL) - Body ground
    		Always
    		1 MΩ or higher


NG
REPLACE INSTRUMENT PANEL WIRE
OK

REPLACE ENGINE ROOM MAIN WIRE