Dtc B1615/14 Front Airbag Sensor Lh Circuit Malfunction

Restraints. Lexus Gs430, Gs300. Uzs190 Grs190
Supplemental Restraint System. Lexus Gs430, Gs300. Uzs190 Grs190

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK DTC

CHECK CONNECTION OF CONNECTORS

CHECK FRONT AIRBAG SENSOR LH CIRCUIT (OPEN)

CHECK FRONT AIRBAG SENSOR LH

CHECK ENGINE ROOM MAIN WIRE

DTC B1615/14 Front Airbag Sensor LH Circuit Malfunction


DESCRIPTION

The front airbag sensor LH consists of the diagnostic circuit, 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 an open circuit 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 Gs430, Gs300. Uzs190 Grs190.Supplemental Restraint System.Airbag System. Dtc B1615/14 Front Airbag Sensor Lh Circuit Malfunction


INSPECTION PROCEDURE

1.CHECK DTC


    Lexus Gs430, Gs300. Uzs190 Grs190.Supplemental Restraint System.Airbag System. Dtc B1615/14 Front Airbag Sensor Lh Circuit Malfunction

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

  1. Clear the DTCs stored in 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 the 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.


OK
USE SIMULATION METHOD TO CHECK
NG


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 connector is properly connected to the center airbag sensor assembly and the front airbag sensor LH.

    OK:
    The connectors are connected.


NG
CONNECT CONNECTORS, THEN GO TO STEP 1
OK


3.CHECK FRONT AIRBAG SENSOR LH CIRCUIT (OPEN)


    Lexus Gs430, Gs300. Uzs190 Grs190.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 front airbag sensor LH.

  1. Using a service wire, connect L44-30 (+SL) and L44-28 (-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.

    Resistance:
    Tester connection
    		Condition
    		Specified condition
    A1-2 (+SL) -
    A1-1(-SL)
    		Always
    		Below 1 Ω


NG
Go to step 5
OK


4.CHECK FRONT AIRBAG SENSOR LH


    Lexus Gs430, Gs300. Uzs190 Grs190.Supplemental Restraint System.Airbag System. Dtc B1615/14 Front Airbag Sensor Lh Circuit Malfunction

  1. Disconnect the service wire from connector "B".

  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 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 the 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

5.CHECK ENGINE ROOM MAIN WIRE


    Lexus Gs430, Gs300. Uzs190 Grs190.Supplemental Restraint System.Airbag System. Dtc B1615/14 Front Airbag Sensor Lh Circuit Malfunction

  1. Disconnect the service wire from connector "B".

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

  1. Using a service wire, connect LA1-2 (+SL) and LA1-1 (-SL) of connector "D".

    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.

    Resistance:
    Tester connection
    		Condition
    		Specified condition
    A1-2 (+SL) -
    A1-1 (-SL)
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE ENGINE ROOM MAIN WIRE
OK

REPAIR OR REPLACE INSTRUMENT PANEL WIRE