DTC    B1890/71    Short in Rear Window Curtain Shield Airbag Squib Circuit

DTC    B1891/71    Open in Rear Window Curtain Shield Airbag Squib Circuit

DTC    B1892/71    Short to GND in Rear Window Curtain Shield Airbag Squib Circuit

DTC    B1893/71    Short to B+ in Rear Window Curtain Shield Airbag Squib Circuit

for Preparation Click here


DESCRIPTION

The rear window curtain shield squib circuit consists of the center airbag sensor assembly and the rear window curtain shield airbag assembly.
The circuit instructs the SRS to deploy when deployment conditions are met.
These DTCs are recorded when a malfunction is detected in the rear window curtain shield squib circuit.

DTC No.
DTC Detection Condition
Trouble Area
B1890/71
When one of following conditions is met:
  1. The center airbag sensor assembly receives a line short circuit signal 5 times in the rear window curtain shield squib circuit during primary check.
  2. Rear window curtain shield squib malfunction
  3. Center airbag sensor assembly malfunction
  1. Floor wire
  2. Rear window curtain shield airbag assembly (Rear window curtain shield squib)
  3. Center airbag sensor assembly
B1891/71
When one of following conditions is met:
  1. The center airbag sensor assembly receives an open circuit signal in the rear window curtain shield squib circuit for 2 seconds.
  2. Rear window curtain shield squib malfunction
  3. Center airbag sensor assembly malfunction
  1. Floor wire
  2. Rear window curtain shield airbag assembly (Rear window curtain shield squib)
  3. Center airbag sensor assembly
B1892/71
When one of following conditions is met:
  1. The center airbag sensor assembly receives a short circuit to ground signal in the rear window curtain shield squib circuit for 0.5 seconds.
  2. Rear window curtain shield squib malfunction
  3. Center airbag sensor assembly malfunction
  1. Floor wire
  2. Rear window curtain shield airbag assembly (Rear window curtain shield squib)
  3. Center airbag sensor assembly
B1893/71
When one of following conditions is met:
  1. The center airbag sensor assembly receives a short circuit to B+ signal in the rear window curtain shield squib circuit for 0.5 seconds.
  2. Rear window curtain shield squib malfunction
  3. Center airbag sensor assembly malfunction
  1. Floor wire
  2. Rear window curtain shield airbag assembly (Rear window curtain shield squib)
  3. Center airbag sensor assembly

WIRING DIAGRAM


C229909E01


INSPECTION PROCEDURE

HINT:
  1. Perform the simulation method by selecting Check Mode (signal check) with the intelligent tester (Click here).
  2. After selecting Check Mode (signal check), perform the simulation method by wiggling each connector of the airbag system or driving the vehicle on various types of roads (Click here).

1.CHECK CONNECTOR

  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 connector is properly connected to the rear window curtain shield airbag assembly.

    OK:
    The connector is properly connected.

    HINT:
    If the connector is not connected securely, reconnect the connector and proceed to the next inspection.

  1. Disconnect the connector from the rear window curtain shield airbag assembly.

  1. Check that the floor wire connector (on the rear window curtain shield airbag assembly side) is not damaged.

    OK:
    The lock button is not disengaged, and the claw of the lock is not deformed or damaged.



NG
REPLACE FLOOR WIRE
OK


2.CHECK REAR WINDOW CURTAIN SHIELD AIRBAG ASSEMBLY (REAR WINDOW CURTAIN SHIELD SQUIB)
C229907E03
SST
09843-18061  

  1. Connect the white wire side of SST (resistance: 2.1 Ω) to connector C.

    CAUTION:
    Never connect the tester to the rear window curtain shield airbag assembly (rear window curtain shield squib) for measurement, as this may lead to a serious injury due to airbag deployment.

    NOTICE:
    1. Do not forcibly insert SST into the terminals of the connector when connecting SST.
    2. Insert SST straight into the terminals of the connector.

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

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

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

  1. Turn the ignition switch off.

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

  1. Check for DTCs (Click here).

    OK:
    DTC B1890, B1891, B1892, B1893 or 71 is not output.

    Text in Illustration 
    *A
    		for LHD
    *B
    		for RHD
    *a
    		Rear Window Curtain Shield Squib
    *b
    		Center Airbag Sensor Assembly
    *c
    		Front view of wire harness connector
    (to Rear Window Curtain Shield Squib)
    *d
    		Connector C

    HINT:
    DTCs other than B1890, B1891, B1892, B1893 and 71 may be output at this time, but they are not related to this check.



NG
Go to step 3
OK

REPLACE REAR WINDOW CURTAIN SHIELD AIRBAG ASSEMBLY (Click here)  

3.CHECK CONNECTOR

  1. Turn the ignition switch off.

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

  1. Disconnect SST from connector C.

  1. Check that the connector is properly connected to the center airbag sensor assembly.

    OK:
    The connector is properly connected.

    HINT:
    If the connector is not connected securely, reconnect the connector and proceed to the next inspection.

  1. Disconnect the connector from the center airbag sensor assembly.

  1. Check that the terminal of the connector is not damaged.

    OK:
    The terminal is not deformed or damaged.

  1. Check that the short spring for the floor wire connector with the activation prevention mechanism is not deformed or damaged.

    OK:
    The short spring is not deformed or damaged.



NG
REPLACE FLOOR WIRE
OK


4.CHECK FLOOR WIRE (REAR WINDOW CURTAIN SHIELD SQUIB - CENTER AIRBAG SENSOR)
C229908E01

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

  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
    G27-1 (IRC-) - Body ground
    		Ignition switch ON
    		Below 1 V
    G27-2 (IRC+) - Body ground
    		Ignition switch ON
    		Below 1 V

    Text in Illustration 
    *A
    		for LHD
    *B
    		for RHD
    *a
    		Rear Window Curtain Shield Squib
    *b
    		Center Airbag Sensor Assembly
    *c
    		Floor Wire
    *d
    		Front view of wire harness connector
    (to Rear Window Curtain Shield Squib)
    *e
    		Connector C

  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
    G27-1 (IRC-) - G27-2 (IRC+)
    		Always
    		Below 1 Ω

  1. Release the activation prevention mechanism built into connector B (Click here).

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    G27-1 (IRC-) - G27-2 (IRC+)
    		Always
    		1 MΩ or higher
    G27-1 (IRC-) - Body ground
    		Always
    		1 MΩ or higher
    G27-2 (IRC+) - Body ground
    		Always
    		1 MΩ or higher

  1. Restore the released activation prevention mechanism of connector B to the original condition.



NG
REPLACE FLOOR WIRE
OK


5.CHECK CENTER AIRBAG SENSOR ASSEMBLY

  1. Connect the connectors to the rear window curtain shield airbag assembly and the center airbag sensor assembly.

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

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

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

  1. Turn the ignition switch off.

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

  1. Check for DTCs (Click here).

    OK:
    DTC B1890, B1891, B1892, B1893 or 71 is not output.

    HINT:
    DTCs other than B1890, B1891, B1892, B1893 and 71 may be output at this time, but they are not related to this check.



NG
REPLACE CENTER AIRBAG SENSOR ASSEMBLY (Click here)
OK

USE SIMULATION METHOD TO CHECK (Click here)