DTC B1865: Short in Knee Airbag (P Side) Squib Circuit; DTC B1866: Open in Knee Airbag (P Side) Squib Circuit; DTC B1867: Short in Knee Airbag (P Side) Squib Circuit (to Ground); DTC B1868: Short in Knee Airbag (P Side) Squib Circuit (to +B) [08/2019 - ]: Procedure

1. Turn the engine switch off.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
3. Disconnect the connector from the lower No. 2 instrument panel airbag.
4. Connect the white wire side of SST (resistance: 2.1 Ω) to connector C.
   WARNING:

   Never connect the tester to the lower No. 2 instrument panel airbag (front passenger side knee 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.
   • SST: 09843-18061 
5. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
6. Turn the engine switch on (IG), and wait for at least 60 seconds.
7. Clear the DTCs (Refer to DTC CHECK / CLEAR [08/2019 - ] ).
8. Turn the engine switch off.
9. Turn the engine switch on (IG), and wait for at least 60 seconds.
10. Check for DTCs (Refer to DTC CHECK / CLEAR [08/2019 - ] ).

    OK

    DTC B1865, B1866, B1867 or B1868 is not output.

    HINT: 

    Codes other than DTC B1865, B1866, B1867 and B1868 may be output at this time, but they are not related to this check.

    TEXT IN ILLUSTRATION
    
    

    *1	Front Passenger Side Knee Squib
    *2	Center Airbag Sensor
    *3	Connector C
    *4	SST
    *a	Front view of wire harness connector (to Front Passenger Side Knee Squib)

Result: 

OK 

REPLACE LOWER NO. 2 INSTRUMENT PANEL AIRBAG ASSEMBLY 

(Refer to REMOVAL [08/2015 - ] )

Result: 

NG 

See step  2

1. Turn the engine switch off.
2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
3. Disconnect SST from connector C.
4. Check that the instrument panel wire connector (on the lower No. 2 instrument panel airbag side) is not damaged.

   OK

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   TEXT IN ILLUSTRATION
   
   

   *1	Front Passenger Side Knee Squib
   *2	Center Airbag Sensor

Result: 

NG 

REPLACE INSTRUMENT PANEL WIRE 

Result: 

OK 

See step  3

1. Disconnect the connectors from center airbag sensor.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   G20-1 (PK+) - Body ground	Engine switch on (IG)	Below 1 V
   G20-2 (PK-) - Body ground	Engine switch on (IG)	Below 1 V

4. Turn the engine 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
   G20-1 (PK+) - G20-2 (PK-)	Always	Below 1 Ω

7. Release the activation prevention mechanism built into connector B (Refer to DIAGNOSIS SYSTEM [08/2019 - ] ).
8. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G20-1 (PK+) - G20-2 (PK-)	Always	1 MΩ or higher
   G20-1 (PK+) - Body ground	Always	1 MΩ or higher
   G20-2 (PK-) - Body ground	Always	1 MΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *1	Front Passenger Side Knee Squib
   *2	Instrument Panel Wire
   *3	Center Airbag Sensor
   *4	Connector C
   *a	Front view of wire harness connector (to Front Passenger Side Knee Squib)

Result: 

NG 

REPLACE INSTRUMENT PANEL WIRE 

Result: 

OK 

See step  4

1. Connect the connectors to the lower No. 2 instrument panel airbag and the center airbag sensor.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
3. Turn the engine switch on (IG), and wait for at least 60 seconds.
4. Clear the DTCs (Refer to DTC CHECK / CLEAR [08/2019 - ] ).
5. Turn the engine switch off.
6. Turn the engine switch on (IG), and wait for at least 60 seconds.
7. Check for DTCs (Refer to DTC CHECK / CLEAR [08/2019 - ] ).

   OK

   DTC B1865, B1866, B1867 or B1868 is not output.

   HINT: 

   Codes other than DTC B1865, B1866, B1867 and B1868 may be output at this time, but they are not related to this check.

   TEXT IN ILLUSTRATION
   
   

   *1	Front Passenger Side Knee Squib
   *2	Center Airbag Sensor

Result: 

OK 

USE SIMULATION METHOD TO CHECK 

(Refer to DIAGNOSIS SYSTEM [08/2019 - ] )

Result: 

NG 

REPLACE CENTER AIRBAG SENSOR ASSEMBLY 

(Refer to REMOVAL [08/2015 - ] )