DTC    B1905/74    Short in Front Passenger Side Pretensioner Squib Circuit

DTC    B1906/74    Open in Front Passenger Side Pretensioner Squib Circuit

DTC    B1907/74    Short to GND in Front Passenger Side Pretensioner Squib Circuit

DTC    B1908/74    Short to B+ in Front Passenger Side Front Pretensioner Squib Circuit

for Preparation Click here


DESCRIPTION

The front passenger side front pretensioner squib circuit consists of the center airbag sensor assembly and the front seat outer belt assembly (front passenger side pretensioner squib).
This circuit signals the SRS to deploy when deployment conditions are met.
These DTCs are recorded when a malfunction is detected in the front passenger side pretensioner squib circuit.

DTC No.
DTC Detection Condition
Trouble Area
B1905/74
When one of following conditions is met:
  1. Center airbag sensor assembly detects line short circuit signal in front passenger side pretensioner squib circuit 5 times during primary check.
  2. Front passenger side pretensioner squib malfunction
  3. Center airbag sensor assembly malfunction
  1. Floor wire
  2. Front seat outer belt assembly (Front passenger side pretensioner squib)
  3. Center airbag sensor assembly
B1906/74
When one of following conditions is met:
  1. Center airbag sensor assembly detects open circuit signal in front passenger side pretensioner squib circuit for 2 seconds.
  2. Front passenger side pretensioner squib malfunction
  3. Center airbag sensor assembly malfunction
  1. Floor wire
  2. Front seat outer belt assembly (Front passenger side pretensioner squib)
  3. Center airbag sensor assembly
B1907/74
When one of following conditions is met:
  1. Center airbag sensor assembly detects short circuit to ground signal in front passenger side pretensioner squib circuit for 0.5 seconds.
  2. Front passenger side pretensioner squib malfunction
  3. Center airbag sensor assembly malfunction
  1. Floor wire
  2. Front seat outer belt assembly (Front passenger side pretensioner squib)
  3. Center airbag sensor assembly
B1908/74
When one of following conditions is met:
  1. Center airbag sensor assembly detects short circuit to B+ signal in front passenger side pretensioner squib circuit for 0.5 seconds.
  2. Front passenger side pretensioner squib malfunction
  3. Center airbag sensor assembly malfunction
  1. Floor wire
  2. Front seat outer belt assembly (Front passenger side pretensioner squib)
  3. Center airbag sensor assembly

WIRING DIAGRAM


C196968E06


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 a city street or rough road (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. Disconnect the connector from the floor wire.

  1. Check the floor wire connector and terminals (on the front seat outer belt assembly (passenger side) side) and check that the connector is properly connected to the front seat outer belt assembly (passenger side).
    Result 
    Result
    		Proceed to
    No problem.
    		A
    Connector or terminals incorrect.
    		B
    Connector connected improperly.
    		C



B
REPLACE FLOOR WIRE

C
CONNECT CONNECTOR PROPERLY
A


2.CHECK FRONT SEAT OUTER BELT ASSEMBLY (FRONT PASSENGER SIDE PRETENSIONER SQUIB)
C196983E01
SST
09843-18061  

  1. Disconnect the connectors from the front seat outer belt assembly (passenger side).

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

    CAUTION:
    Never connect a tester to the front seat outer belt assembly (passenger side) 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.
    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 the DTCs (Click here).

    OK:
    DTC B1905, B1906, B1907, B1908 or 74 is not output.

    Text in Illustration 
    *1
    		for LHD
    *2
    		for RHD
    *3
    		Front Passenger Side Pretensioner Squib
    *4
    		Center Airbag Sensor Assembly
    *5
    		Floor Wire
    *6
    		Front view of wire harness connector
    (to Front Passenger Side Pretensioner Squib)
    *7
    		Connector C

    HINT:
    DTCs other than B1905, B1906, B1907, B1908 and 74 may be output at this time, but they are not related to this check.



NG
Go to step 3
OK

REPLACE FRONT SEAT OUTER BELT ASSEMBLY (FRONT PASSENGER SIDE PRETENSIONER SQUIB) (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 the SST from connector C.

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

  1. Check the floor wire connector and terminals (on the center airbag sensor assembly side) and check that the connector is properly connected to the center airbag sensor assembly .
    Result 
    Result
    		Proceed to
    No problem.
    		A
    Connector or terminals incorrect.
    		B
    Connector connected improperly.
    		C



B
REPLACE FLOOR WIRE

C
CONNECT CONNECTOR PROPERLY
A


4.CHECK FLOOR WIRE (FRONT PASSENGER SIDE PRETENSIONER SQUIB CIRCUIT)
C196984E01

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

  1. Check for short to B+ in the circuit.

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

    2. Turn the ignition switch to ON.

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

      Standard Voltage:
      for LHD 
      Tester Connection
      		Switch Condition
      		Specified Condition
      G21-1 (R-) - Body ground
      		Ignition switch ON
      		Below 1 V
      G21-2 (R+) - Body ground
      		Ignition switch ON
      		Below 1 V
      for RHD 
      Tester Connection
      		Switch Condition
      		Specified Condition
      G22-1 (L-) - Body ground
      		Ignition switch ON
      		Below 1 V
      G22-2 (L+) - Body ground
      		Ignition switch ON
      		Below 1 V

      Text in Illustration 
      *1
      		for LHD
      *2
      		for RHD
      *3
      		Front Passenger Side Pretensioner Squib
      *4
      		Center Airbag Sensor Assembly
      *5
      		Floor Wire
      *6
      		Front view of wire harness connector
      (to Front Passenger Side Pretensioner Squib)
      *7
      		Connector C

  1. Check for open in the circuit.

    1. Turn the ignition switch off.

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

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

      Standard Resistance:
      for LHD 
      Tester Connection
      		Condition
      		Specified Condition
      G21-1 (R-) - G21-2 (R+)
      		Always
      		Below 1 Ω
      for RHD 
      Tester Connection
      		Condition
      		Specified Condition
      G22-1 (L-) - G22-2 (L+)
      		Always
      		Below 1 Ω

  1. Check for short to ground in the circuit.

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

      Standard Resistance:
      for LHD 
      Tester Connection
      		Condition
      		Specified Condition
      G21-1 (R-) - Body ground
      		Always
      		1 MΩ or higher
      G21-2 (R+) - Body ground
      		Always
      		1 MΩ or higher
      for RHD 
      Tester Connection
      		Condition
      		Specified Condition
      G22-1 (L-) - Body ground
      		Always
      		1 MΩ or higher
      G22-2 (L+) - Body ground
      		Always
      		1 MΩ or higher

  1. Check for short in the circuit.

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

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

      Standard Resistance:
      for LHD 
      Tester Connection
      		Condition
      		Specified Condition
      G21-1 (R-) - G21-2 (R+)
      		Always
      		1 MΩ or higher
      for RHD 
      Tester Connection
      		Condition
      		Specified Condition
      G22-1 (L-) - G22-2 (L+)
      		Always
      		1 MΩ or higher

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



NG
REPLACE FLOOR WIRE
OK


5.CHECK CENTER AIRBAG SENSOR ASSEMBLY
C146261E35

  1. Connect the connectors to the front seat outer belt assembly (passenger side) 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 the DTCs (Click here).

    OK:
    DTC B1905, B1906, B1907, B1908 or 74 is not output.

    Text in Illustration 
    *1
    		Front Passenger Side Pretensioner Squib
    *2
    		Center Airbag Sensor Assembly

    HINT:
    DTCs other than B1905, B1906, B1907, B1908 and 74 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)