AIRBAG SYSTEM(w/ Occupant Classification System), Diagnostic DTC:B181A/7A,B181B/7A,B181C/7A and B181D/7A

DESCRIPTION

WIRING DIAGRAM

CAUTION / NOTICE / HINT

PROCEDURE

1. CHECK INSTRUMENT PANEL PASSENGER AIRBAG ASSEMBLY (VARIABLE VENT HOLE SQUIB)

   1. 

      *1	Variable Vent Hole Squib
      *2	Airbag Sensor Assembly
      *3	Connector E
      *4	SST
      *a	Front view of wire harness connector (to Variable Vent Hole Squib)
      *b	Color: Green

      Turn the ignition switch off.

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

   3. Disconnect the connectors from the instrument panel passenger airbag assembly.

   4. Connect the white wire side of SST (resistance: 2.1 Ω) to connector E (green connector).

      CAUTION:

      Never connect the tester to the instrument panel passenger airbag assembly (variable vent hole squib) for measurement, as this may lead to a serious injury due to airbag deployment.

      Note:

      • Do not forcibly insert SST into the terminals of the connector when connecting SST.

      • Insert SST straight into the terminals of the connector.

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

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

   7. Clear the DTCs.

      Click here

      Body Electrical > SRS Airbag > Clear DTCs

   8. Turn the ignition switch off.

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

   10. Check for DTCs.

       Click here

       Body Electrical > SRS Airbag > Trouble Codes

       Result

       Proceed to
       DTC B181A/7A, B181B/7A, B181C/7A or B181D/7A is not output
       DTC B181A/7A, B181B/7A, B181C/7A or B181D/7A is output

       Tip:

       Codes other than DTC B181A/7A, B181B/7A, B181C/7A and B181D/7A may be output at this time, but they are not related to this check.

   09843-18061

   DTC B181A/7A, B181B/7A, B181C/7A or B181D/7A is not output

   REPLACE INSTRUMENT PANEL PASSENGER AIRBAG ASSEMBLY

   Click here

   DTC B181A/7A, B181B/7A, B181C/7A or B181D/7A is output

2. CHECK CONNECTOR

   1. Turn the ignition switch off.

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

   3. Disconnect SST from connector E.

   4. Disconnect the connectors from the airbag sensor assembly.

   5. 

      *1	Variable Vent Hole Squib
      *2	Airbag Sensor Assembly

      Check that the connectors (on the airbag sensor assembly side and instrument panel passenger airbag assembly side) are not damaged.

      OK

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

   Result

   Proceed to
   OK
   NG

   NG

   REPLACE HARNESS AND CONNECTOR

   OK

3. CHECK VARIABLE VENT HOLE SQUIB CIRCUIT

   1. 

      *1	Variable Vent Hole Squib
      *2	Airbag Sensor Assembly
      *3	Connector E
      *a	Front view of wire harness connector (to Variable Vent Hole Squib)
      *b	Color: Green

      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

      Tester Connection	Switch Condition	Specified Condition
      b3-2 (VHP+) - Body ground	Ignition switch ON	Below 1 V
      b3-1 (VHP-) - Body ground	Ignition switch ON	Below 1 V

   4. Turn the ignition switch off.

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

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

      Standard Resistance

      Tester Connection	Condition	Specified Condition
      b3-2 (VHP+) - b3-1 (VHP-)	Always	Below 1 Ω

   7. Release the activation prevention mechanism built into connector B.

      Click here

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

      Standard Resistance

      Tester Connection	Condition	Specified Condition
      b3-2 (VHP+) - b3-1 (VHP-)	Always	1 MΩ or higher

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

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

       Standard Resistance

       Tester Connection	Condition	Specified Condition
       b3-2 (VHP+) - Body ground	Always	1 MΩ or higher
       b3-1 (VHP-) - Body ground	Always	1 MΩ or higher

   Result

   Proceed to
   OK
   NG

   NG

   CHECK VARIABLE VENT HOLE SQUIB CIRCUITClick here

   OK

4. CHECK AIRBAG SENSOR ASSEMBLY

   1. 

      *1	Variable Vent Hole Squib
      *2	Airbag Sensor Assembly

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

   2. Connect the connectors to the instrument panel passenger airbag assembly and airbag sensor assembly.

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

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

   5. Clear the DTCs.

      Click here

      Body Electrical > SRS Airbag > Clear DTCs

   6. Turn the ignition switch off.

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

   8. Check for DTCs.

      Click here

      Body Electrical > SRS Airbag > Trouble Codes

      Result

      Proceed to
      DTC B181A/7A, B181B/7A, B181C/7A or B181D/7A is output
      DTC B181A/7A, B181B/7A, B181C/7A or B181D/7A is not output

      Tip:

      Codes other than DTC B181A/7A, B181B/7A, B181C/7A and B181D/7A may be output at this time, but they are not related to this check.

   DTC B181A/7A, B181B/7A, B181C/7A or B181D/7A is output

   USE SIMULATION METHOD TO CHECK

   Click here

   DTC B181A/7A, B181B/7A, B181C/7A or B181D/7A is not output

   REPLACE AIRBAG SENSOR ASSEMBLY

   Click here

5. CHECK VARIABLE VENT HOLE SQUIB CIRCUIT

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

   2. 

      *1	Variable Vent Hole Squib
      *2	No. 2 Instrument Panel Wire
      *3	Instrument Panel Wire
      *4	Airbag Sensor Assembly
      *5	Connector E
      *a	Front view of wire harness connector (to No. 2 Instrument Panel Wire)

      Disconnect the instrument panel wire connector from the No. 2 instrument panel wire.

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

   4. Turn the ignition switch to ON.

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

      Standard Voltage

      Tester Connection	Switch Condition	Specified Condition
      Gb3-1 (VHP+) - Body ground	Ignition switch ON	Below 1 V
      Gb3-2 (VHP-) - Body ground	Ignition switch ON	Below 1 V

   6. Turn the ignition switch off.

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

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

      Standard Resistance

      Tester Connection	Condition	Specified Condition
      Gb3-1 (VHP+) - Gb3-2 (VHP-)	Always	Below 1 Ω

   9. Release the activation prevention mechanism built into connector B.

      Click here

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

       Standard Resistance

       Tester Connection	Condition	Specified Condition
       Gb3-1 (VHP+) - Gb3-2 (VHP-)	Always	1 MΩ or higher

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

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

       Standard Resistance

       Tester Connection	Condition	Specified Condition
       Gb3-1 (VHP+) - Body ground	Always	1 MΩ or higher
       Gb3-2 (VHP-) - Body ground	Always	1 MΩ or higher

   Result

   Proceed to
   OK
   NG

   OK

   REPLACE NO. 2 INSTRUMENT PANEL WIRE

   NG

   REPLACE NO. 2 INSTRUMENT PANEL WIRE