Dtc B1615/14 Front Airbag Sensor Lh Circuit Malfunction

Restraints. Lexus Is250, Is220D. Gse20 Ale20
Supplemental Restraint System. Lexus Is250, Is220D. Gse20 Ale20

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK DTC

CHECK CONNECTION OF 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 consists of the diagnostic circuit and the frontal deceleration sensor, etc.
If 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 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 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. 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


Lexus Is250, Is220D. Gse20 Ale20.Supplemental Restraint System.Airbag System. Dtc B1615/14 Front Airbag Sensor Lh Circuit Malfunction


INSPECTION PROCEDURE

1.CHECK DTC


    Lexus Is250, Is220D. Gse20 Ale20.Supplemental Restraint System.Airbag System. Dtc B1615/14 Front Airbag Sensor Lh Circuit Malfunction

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

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

  1. Turn the engine switch on (IG), and wait for at least 60 seconds.

  1. Clear the DTCs stored in the memory (Click here).

  1. Turn the engine switch off.

  1. Turn the engine switch on (IG), and wait for at least 60 seconds.

  1. Check for DTCs (Click here).

    OK:
    DTC B1615/14 is not output.
    HINT:
    Codes other than DTC B1615/14 may be output at this time, but they are not related to this check.


NG
Go to step 2
OK

USE SIMULATION METHOD TO CHECK

2.CHECK CONNECTION OF CONNECTORS

  1. Turn the engine 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, THEN GO TO STEP 1
OK


3.CHECK FRONT AIRBAG SENSOR LH CIRCUIT (OPEN)


    Lexus Is250, Is220D. Gse20 Ale20.Supplemental Restraint System.Airbag System. Dtc B1615/14 Front Airbag Sensor Lh Circuit Malfunction

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

  1. Using a service wire, connect J47-30 (+SL) and J47-28 (-SL) of connector "B".

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

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

    Standard resistance:
    Tester connection
    		Condition
    		Specified condition
    A12-2 (+SL) - A12-1 (-SL)
    		Always
    		Below 1 Ω


NG
Go to step 8
OK


4.CHECK FRONT AIRBAG SENSOR LH CIRCUIT (SHORT)


    Lexus Is250, Is220D. Gse20 Ale20.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 according to the value(s) in the table below.

    Standard resistance:
    Tester connection
    		Condition
    		Specified condition
    A12-2 (+SL) - A12-1 (-SL)
    		Always
    		1 MΩ or higher


NG
Go to step 9
OK


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


    Lexus Is250, Is220D. Gse20 Ale20.Supplemental Restraint System.Airbag System. 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 engine switch on (IG).

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

    Standard voltage:
    Tester connection
    		Condition
    		Specified condition
    A12-2 (+SL) - Body ground
    		Engine switch on (IG)
    		Below 1 V
    A12-1 (-SL) - Body ground
    		Engine switch on (IG)
    		Below 1 V


NG
Go to step 10
OK


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


    Lexus Is250, Is220D. Gse20 Ale20.Supplemental Restraint System.Airbag System. Dtc B1615/14 Front Airbag Sensor Lh Circuit Malfunction

  1. Turn the engine switch off.

  1. Disconnect the negative (-) terminal cable from the battery, 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
    A12-2 (+SL) - Body ground
    		Always
    		1 MΩor higher
    A12-1 (-SL) - Body ground
    		Always
    		1 MΩor higher


NG
Go to step 11
OK


7.CHECK FRONT AIRBAG SENSOR LH


    Lexus Is250, Is220D. Gse20 Ale20.Supplemental Restraint System.Airbag System. 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 RH with LH 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 engine switch on (IG), and wait for at least 60 seconds.

  1. Clear the DTCs stored in the memory (Click here).

  1. Turn the engine switch off.

  1. Turn the engine switch on (IG), and wait for at least 60 seconds.

  1. Check for DTCs (Click here).

    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:
    Codes 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 INSTRUMENT PANEL WIRE (OPEN)


    Lexus Is250, Is220D. Gse20 Ale20.Supplemental Restraint System.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:
    The service wire 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
    JA1-2 (+SL) - JA1-1 (-SL)
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE INSTRUMENT PANEL WIRE
OK

REPAIR OR REPLACE ENGINE ROOM MAIN WIRE

9.CHECK INSTRUMENT PANEL WIRE (SHORT)


    Lexus Is250, Is220D. Gse20 Ale20.Supplemental Restraint System.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
    JA1-2 (+SL) - JA1-1 (-SL)
    		Always
    		1 MΩ or higher


NG
REPAIR OR REPLACE INSTRUMENT PANEL WIRE
OK

REPAIR OR REPLACE ENGINE ROOM MAIN WIRE

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


    Lexus Is250, Is220D. Gse20 Ale20.Supplemental Restraint System.Airbag System. Dtc B1615/14 Front Airbag Sensor Lh Circuit Malfunction

  1. Turn the engine switch off.

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

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

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

  1. Turn the engine switch on (IG).

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

    Standard voltage:
    Tester connection
    		Condition
    		Specified condition
    JA1-2 (+SL) - Body ground
    		Engine switch on (IG)
    		Below 1 V
    JA1-1 (-SL) - Body ground
    		Engine switch on (IG)
    		Below 1 V


NG
REPAIR OR REPLACE INSTRUMENT PANEL WIRE
OK

REPAIR OR REPLACE ENGINE ROOM MAIN WIRE

11.CHECK INSTRUMENT PANEL WIRE (SHORT TO GROUND)


    Lexus Is250, Is220D. Gse20 Ale20.Supplemental Restraint System.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
    JA1-2 (+SL) - Body ground
    		Always
    		1 MΩ or higher
    JA1-1 (-SL) - Body ground
    		Always
    		1 MΩ or higher


NG
REPAIR OR REPLACE INSTRUMENT PANEL WIRE
OK

REPAIR OR REPLACE ENGINE ROOM MAIN WIRE