DTC    B1920/77    Short in Rear Pretensioner Squib RH Circuit

DTC    B1921/77    Open in Rear Pretensioner Squib RH Circuit

DTC    B1922/77    Short to GND in Rear Pretensioner Squib RH Circuit

DTC    B1923/77    Short to B+ in Rear Pretensioner Squib RH Circuit

for Preparation Click here


DESCRIPTION

The rear pretensioner squib RH circuit consists of the center airbag sensor assembly and the rear seat outer belt assembly RH.
This circuit instructs the SRS to deploy when deployment conditions are met.
These DTCs are recorded when a malfunction is detected in the rear pretensioner squib RH circuit.

DTC No.
DTC Detection Condition
Trouble Area
B1920/77
  1. The center airbag sensor assembly receives a line short circuit signal 5 times in the rear pretensioner squib RH circuit during primary check.
  2. Rear pretensioner squib RH malfunction
  3. Center airbag sensor assembly malfunction
  1. Floor wire
  2. Rear seat outer belt assembly RH (Rear pretensioner squib RH)
  3. Center airbag sensor assembly
B1921/77
  1. The center airbag sensor assembly receives an open circuit signal in the rear pretensioner squib RH circuit for 2 seconds.
  2. Rear pretensioner squib RH malfunction
  3. Center airbag sensor assembly malfunction
  1. Floor wire
  2. Rear seat outer belt assembly RH (Rear pretensioner squib RH)
  3. Center airbag sensor assembly
B1922/77
  1. The center airbag sensor assembly receives a short circuit to ground signal in the rear pretensioner squib RH circuit for 0.5 seconds.
  2. Rear pretensioner squib RH malfunction
  3. Center airbag sensor assembly malfunction
  1. Floor wire
  2. Rear seat outer belt assembly RH (Rear pretensioner squib RH)
  3. Center airbag sensor assembly
B1923/77
  1. The center airbag sensor assembly receives a short circuit to B+ signal in the rear pretensioner squib RH circuit for 0.5 seconds.
  2. Rear pretensioner squib RH malfunction
  3. Center airbag sensor assembly malfunction
  1. Floor wire
  2. Rear seat outer belt assembly RH (Rear pretensioner squib RH)
  3. Center airbag sensor assembly

WIRING DIAGRAM


H001454E34


INSPECTION PROCEDURE

HINT:
  1. Perform the simulation method by selecting the "check mode" (signal check) with the intelligent tester (Click here).
  2. After selecting the "check mode" (signal check), perform the simulation method by wiggling each connector of the airbag system or driving the vehicle on a city or rough road (Click here).

1.CHECK REAR SEAT OUTER BELT ASSEMBLY RH (REAR PRETENSIONER SQUIB RH)


    C109515E02

  1. Turn the engine switch off.

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

  1. Disconnect the connectors from the rear seat outer belt assembly RH.

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

    CAUTION:
    Never connect a tester to the rear seat outer belt assembly RH (Rear pretensioner squib RH) for measurement, as the may lead to a serious injury due to airbag deployment.

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

SST
09843-18060  

  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).

    OK:
    DTC B1920, B1921, B1922, B1923 or 77 is not output.

    HINT:
    Codes other than DTC B1920, B1921, B1922, B1923 and 77 may be output at this time, but they are not related to this check.



OK
REPLACE REAR SEAT OUTER BELT ASSEMBLY RH
NG


2.CHECK FLOOR WIRE (REAR PRETENSIONER SQUIB RH CIRCUIT)


    H044040E02

  1. Turn the engine switch off.

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

  1. Disconnect the SST from connector "C".

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

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

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

    2. Turn the engine switch on (IG).

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

      Voltage:
      Tester connection
      		Condition
      		Specified condition
      V18-1 (RR+) -
      Body ground
      		Engine switch on (IG)
      		Below 1 V
      V18-2 (RR-) -
      Body ground
      		Engine switch on (IG)
      		Below 1 V

  1. Check the open in the circuit.

    1. Turn the engine switch off.

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

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

      Resistance:
      Tester connection
      		Condition
      		Specified condition
      V18-1 (RR+) -
      V18-2 (RR-)
      		Always
      		Below 1 Ω

  1. Check the short to ground in the circuit.

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

      Resistance:
      Tester connection
      		Condition
      		Specified condition
      V18-1 (RR+) -
      Body ground
      		Always
      		1 MΩ or higher
      V18-2 (RR-)
      Body ground
      		Always
      		1 MΩ or higher

  1. Check the 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.

      Resistance:
      Tester connection
      		Condition
      		Specified condition
      V18-1 (RR+) -
      V18-2 (RR-)
      		Always
      		1 MΩ or higher



NG
REPAIR OR REPLACE FLOOR WIRE
OK


3.CHECK CENTER AIRBAG SENSOR ASSEMBLY


    C109516E01

  1. Connect the connectors to the rear seat outer belt assembly RH and the center airbag sensor assembly.

  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).

    OK:
    DTC B1920, B1921, B1922, B1923 or 77 is not output.

    HINT:
    Codes other than DTC B1920, B1921, B1922, B1923 and 77 may be output at this time, but they are not related to this check.



NG
REPLACE CENTER AIRBAG SENSOR ASSEMBLY
OK

USE SIMULATION METHOD TO CHECK