Dtc B1635/24 Rear 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 FLOOR WIRE NO.2 (OPEN)

CHECK FLOOR WIRE NO.2 (SHORT)

CHECK FLOOR WIRE NO.2 (SHORT TO B+)

CHECK FLOOR WIRE NO.2 (SHORT TO GROUND)

CHECK REAR AIRBAG SENSOR LH

DTC B1635/24 Rear Airbag Sensor LH Circuit Malfunction


DESCRIPTION

The rear airbag sensor LH consists of the safing sensor, the diagnostic circuit, the lateral deceleration sensor, etc.
If the center airbag sensor assembly receives signals from the lateral deceleration sensor, it determines whether or not the SRS should be activated.
DTC B1635/24 is recorded when a malfunction is detected in the rear airbag sensor LH circuit.

DTC No.
DTC Detecting Condition
Trouble Area
B1635/24
  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 rear airbag sensor LH circuit for 2 seconds.
  2. Rear airbag sensor LH malfunction
  3. Center airbag sensor assembly malfunction
  1. Floor wire No.2
  2. Rear airbag sensor LH
  3. Center airbag sensor assembly

WIRING DIAGRAM


Lexus Gs430, Gs300. Uzs190 Grs190.Supplemental Restraint System.Airbag System. Dtc B1635/24 Rear Airbag Sensor Lh Circuit Malfunction


INSPECTION PROCEDURE

1.CHECK DTC


    Lexus Gs430, Gs300. Uzs190 Grs190.Supplemental Restraint System.Airbag System. Dtc B1635/24 Rear 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 B1635/24 is not output.
    HINT:
    Codes other than DTC B1635/24 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 connectors are properly connected to the center airbag sensor assembly and the rear airbag sensor LH.

    OK:
    The connectors are connected.


NG
CONNECT CONNECTORS, THEN GO TO STEP 1
OK


3.CHECK FLOOR WIRE NO.2 (OPEN)


    Lexus Gs430, Gs300. Uzs190 Grs190.Supplemental Restraint System.Airbag System. Dtc B1635/24 Rear Airbag Sensor Lh Circuit Malfunction

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

  1. Using a service wire, connect W16-21 (VUCL) and W16-19 (ESCL) 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
    W12-2 (VUCL) -
    W12-1 (ESCL)
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE FLOOR WIRE NO.2
OK


4.CHECK FLOOR WIRE NO.2 (SHORT)


    Lexus Gs430, Gs300. Uzs190 Grs190.Supplemental Restraint System.Airbag System. Dtc B1635/24 Rear 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.

    Resistance:
    Tester connection
    		Condition
    		Specified condition
    W12-2 (VUCL) -
    W12-1 (ESCL)
    		Always
    		1 MΩ or higher


NG
REPAIR OR REPLACE FLOOR WIRE NO.2
OK


5.CHECK FLOOR WIRE NO.2 (SHORT TO B+)


    Lexus Gs430, Gs300. Uzs190 Grs190.Supplemental Restraint System.Airbag System. Dtc B1635/24 Rear 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.

    Voltage:
    Tester connection
    		Condition
    		Specified condition
    W12-2 (VUCL) -
    Body ground
    		Engine switch on (IG)
    		Below 1 V
    W12-1 (ESCL) -
    Body ground
    		Engine switch on (IG)
    		Below 1 V


NG
REPAIR OR REPLACE FLOOR WIRE NO.2
OK


6.CHECK FLOOR WIRE NO.2 (SHORT TO GROUND)


    Lexus Gs430, Gs300. Uzs190 Grs190.Supplemental Restraint System.Airbag System. Dtc B1635/24 Rear 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.

    Resistance:
    Tester connection
    		Condition
    		Specified condition
    W12-2 (VUCL) -
    Body ground
    		Always
    		1 MΩ or higher
    W12-1 (ESCL) -
    Body ground
    		Always
    		1 MΩ or higher


NG
REPAIR OR REPLACE FLOOR WIRE NO.2
OK


7.CHECK REAR AIRBAG SENSOR LH


    Lexus Gs430, Gs300. Uzs190 Grs190.Supplemental Restraint System.Airbag System. Dtc B1635/24 Rear Airbag Sensor Lh Circuit Malfunction

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

  1. Interchange the rear 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 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 B1635/24 is output.
    		A
    DTC B1630/23 is output.
    		B
    DTC B1630/23 and B1635/24 are not output.
    		C


A
REPLACE CENTER AIRBAG SENSOR ASSEMBLY

B
REPLACE REAR AIRBAG SENSOR LH
C

USE SIMULATION METHOD TO CHECK