Inspection Procedure

HINT:

• Perform the simulation method by selecting the "CHECK MODE" (signal check) with the intelligent tester (see CHECK MODE PROCEDURE ).
• 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 (see CHECK MODE PROCEDURE ).

1. CHECK STEERING PAD (DRIVER SIDE SQUIB 2ND STEP) 
   1. 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 steering pad.
   4. Connect the white wire side of SST (resistance 2.1 Ω) to connector E.
      CAUTION: Never connect a tester to the steering pad (driver side squib 2nd step) 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.
      • Insert SST straight into the terminals of the connector.

      SST 09843-18060 

   5. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
   6. Turn the ignition switch ON, and wait for at least 60 seconds.
   7. Clear the DTCs (see DTC CHECK / CLEAR ).
   8. Turn the ignition switch OFF.
   9. Turn the ignition switch ON, and wait for at least 60 seconds.
   10. Check the DTCs (see DTC CHECK / CLEAR ).

   OK: DTC B1810, B1811, B1812, B1813 or 53 is not output. 

   Fig 1: Checking Steering Pad (Driver Side Squib 2Nd Step)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   HINT:

   DTCs other than DTC B1810, B1811, B1812, B1813 or 53 may be output at this time, but they are not related to this check.

   OK: REPLACE STEERING PAD 

   NG: GO to Next Step 

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. Check that the spiral cable connector (on the steering pad side) is not damaged.

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

   NG: REPLACE SPIRAL CABLE 

   OK: GO to Next Step 

3. CHECK DRIVER SIDE SQUIB 2ND STEP CIRCUIT 
   1. Disconnect the connector from the center airbag sensor.
   2. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
   3. Turn the ignition switch ON.
   4. Measure the voltage of the wire harness side connector.

      Standard voltage 

      TESTER CONNECTION AND SPECIFIED CONDITION
      
      

      Tester Connection	Specified Condition
      D2+ - Body ground	Below 1 V
      D2- - Body ground	Below 1 V

   5. Turn the ignition switch OFF.
   6. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
   7. Measure the resistance of the wire harness side connector.

      Standard resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION
      
      

      Tester Connection	Specified Condition
      D2+ - D2-	Below 1 Ω
      D2+ - Body ground	1 MΩ or higher
      D2- - Body ground	1 MΩ or higher

      Fig 2: Checking Driver Side Squib 2Nd Step Circuit

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   8. Release the activation prevention mechanism built into connector B (see DIAGNOSIS SYSTEM ).
   9. Measure the resistance of the wire harness side connector.

      Standard resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION
      
      

      Tester Connection	Specified Condition
      D2+ - D2-	1 MΩ or higher

   OK: REPLACE CENTER AIRBAG SENSOR ASSEMBLY 

   OK: GO to Next Step 

4. CHECK INSTRUMENT PANEL WIRE 
   1. Restore the released activation prevention mechanism of connector B to its original position.
   2. Disconnect the instrument panel wire connector from the spiral cable.
   3. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
   4. Turn fire ignition switch ON,
   5. Measure the voltage of the wire harness side connector.

      Standard voltage 

      TESTER CONNECTION AND SPECIFIED CONDITION
      
      

      Tester Connection	Specified Condition
      E8-4 (D2+) - Body ground	Below 1V
      E8-3 (D2-) - Body ground	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 of the wire harness side connector.

      Standard resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION
      
      

      Tester Connection	Specified Condition
      E8-4 (D2+) - E8-3 (D2-)	Below 1 Ω
      E8-4 (D2+) - Body ground	1 MΩ or higher
      E8-3 (D2-) - Body ground	1 MΩ or higher

      Fig 3: Checking Instrument Panel Wire

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   9. Release the activation prevention mechanism built into connector B (see DIAGNOSIS SYSTEM ).
   10. Measure the resistance of the wire harness side connector.

       Standard resistance 

       TESTER CONNECTION AND SPECIFIED CONDITION
       
       

       Tester Connection	Specified Condition
       E8-4 (D2+) - E8-3 (D2-)	1 MΩ or higher

   NG: REPAIR OR REPLACE INSTRUMENT PANEL WIRE 

   OK: REPLACE SPIRAL CABLE