Dtc B1620/21 Side Airbag Sensor Assembly Rh 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 (OPEN)

CHECK FLOOR WIRE (SHORT)

CHECK FLOOR WIRE (SHORT TO B+)

CHECK FLOOR WIRE (SHORT TO GROUND)

CHECK SIDE AIRBAG SENSOR ASSEMBLY RH

DTC B1620/21 Side Airbag Sensor Assembly RH Circuit Malfunction


DESCRIPTION

The side airbag sensor assembly RH 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 B1620/21 is recorded when a malfunction is detected in the side airbag sensor assembly RH circuit.

DTC No.
DTC Detecting Condition
Trouble Area
B1620/21
  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 side airbag sensor assembly assembly RH circuit for 2 seconds.
  2. Side airbag sensor assembly RH malfunction
  3. Center airbag sensor assembly malfunction
  1. Floor wire
  2. Side airbag sensor assembly RH
  3. Center airbag sensor assembly

WIRING DIAGRAM


Lexus Gs430, Gs300. Uzs190 Grs190.Supplemental Restraint System.Airbag System. Dtc B1620/21 Side Airbag Sensor Assembly Rh Circuit Malfunction


INSPECTION PROCEDURE

1.CHECK DTC


    Lexus Gs430, Gs300. Uzs190 Grs190.Supplemental Restraint System.Airbag System. Dtc B1620/21 Side Airbag Sensor Assembly Rh 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 B1620/21 is not output.
    HINT:
    Codes other than DTC B1620/21 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 side airbag sensor assembly RH.

    OK:
    The connectors are connected.


NG
CONNECT CONNECTORS, THEN GO TO STEP 1
OK


3.CHECK FLOOR WIRE (OPEN)


    Lexus Gs430, Gs300. Uzs190 Grs190.Supplemental Restraint System.Airbag System. Dtc B1620/21 Side Airbag Sensor Assembly Rh Circuit Malfunction

  1. Disconnect the connectors from the center airbag sensor assembly and the side airbag sensor assembly RH.

  1. Vsing a service wire, connect V13-19 (VUPR) and V13-21 (ESR) 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
    V5-2 (VUPR) -
    V5-1 (ESR)
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE FLOOR WIRE
OK


4.CHECK FLOOR WIRE (SHORT)


    Lexus Gs430, Gs300. Uzs190 Grs190.Supplemental Restraint System.Airbag System. Dtc B1620/21 Side Airbag Sensor Assembly Rh 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
    V5-2 (VUPR) -
    V5-1 (ESR)
    		Always
    		1 MΩ or higher


NG
REPAIR OR REPLACE FLOOR WIRE
OK


5.CHECK FLOOR WIRE (SHORT TO B+)


    Lexus Gs430, Gs300. Uzs190 Grs190.Supplemental Restraint System.Airbag System. Dtc B1620/21 Side Airbag Sensor Assembly Rh 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
    V5-2 (VUPR) -
    Body ground
    		Engine switch on (IG)
    		Below 1 V
    V5-1 (ESR) -
    Body ground
    		Engine switch on (IG)
    		Below 1 V


NG
REPAIR OR REPLACE FLOOR WIRE
OK


6.CHECK FLOOR WIRE (SHORT TO GROUND)


    Lexus Gs430, Gs300. Uzs190 Grs190.Supplemental Restraint System.Airbag System. Dtc B1620/21 Side Airbag Sensor Assembly Rh 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
    V5-2 (VUPR) -
    Body ground
    		Always
    		1 MΩ or higher
    V5-1 (ESR) -
    Body ground
    		Always
    		1 MΩ or higher


NG
REPAIR OR REPLACE FLOOR WIRE
OK


7.CHECK SIDE AIRBAG SENSOR ASSEMBLY RH


    Lexus Gs430, Gs300. Uzs190 Grs190.Supplemental Restraint System.Airbag System. Dtc B1620/21 Side Airbag Sensor Assembly Rh Circuit Malfunction

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

  1. Interchange the side airbag sensor assembly 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 B1620/21 is output.
    		A
    DTC B1625/22 is output.
    		B
    DTC B1620/21 and B1625/22 are not output.
    		C
    HINT:
    Codes other than DTC B1620/21 and B1625/22 may be output at this time, but they are not related to this check.


A
REPLACE CENTER AIRBAG SENSOR ASSEMBLY

B
REPLACE SIDE AIRBAG SENSOR ASSEMBLY RH
C

USE SIMULATION METHOD TO CHECK