DTC B1860/64: Short in Driver Side Knee Airbag Squib Circuit; DTC B1861/64: Open in Driver Side Knee Airbag Squib Circuit; DTC B1862/64: Short to GND in Driver Side Knee Airbag Squib Circuit; DTC B1863/64: Short to B+ in Driver Side Knee Airbag Squib Circuit: Procedure

1. Turn the ignition switch off.
   Fig 1: Checking Lower No. 1 Instrument Panel Airbag (Driver Side Knee Squib)

   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. 1 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. 1 instrument panel airbag (driver 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 ignition switch to ON, and wait for at least 60 seconds.
7. Clear the DTCs. Refer to DTC CHECK / CLEAR .
8. Turn the ignition switch off.
9. Turn the ignition switch to ON, and wait for at least 60 seconds.
10. Check for DTCs. Refer to DTC CHECK / CLEAR .

    OK

    DTC B1860, B1861, B1862 or B1863 is not output.

    HINT: 

    Codes other than DTC B1860, B1861, B1862 and B1863 may be output at this time, but they are not related to this check.

    TEXT IN ILLUSTRATION
    
    

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

NG → See step   2 

OK → See step   6 

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 C.
4. Disconnect the connectors from the center airbag sensor.
5. Check that the connectors (on the center airbag sensor side and lower No. 1 instrument panel airbag side) are not damaged.

   OK

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

   Fig 2: Checking Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

   *1	Driver Side Knee Squib
   *2	Instrument Panel Wire
   *2	Center Airbag Sensor

NG → REPLACE INSTRUMENT PANEL WIRE 

OK: Go to next step 

1. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
   Fig 3: Checking Instrument Panel Wire (Lower No. 1 Instrument Panel Airbag - Center Airbag Sensor)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   C33-1 (DK+) - Body ground	Ignition switch ON	Below 1 V
   C33-2 (DK-) - Body ground	Ignition switch ON	Below 1 V

3. Turn the ignition switch off.
4. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
5. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   C33-1 (DK+) - C33-2 (DK-)	Always	Below 1 Ω

6. Release the activation prevention mechanism built into connector B. Refer to DIAGNOSIS SYSTEM .
7. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   C33-1 (DK+) - C33-2 (DK-)	Always	1 MΩ or higher
   C33-1 (DK+) - Body ground	Always	1 MΩ or higher
   C33-2 (DK-) - Body ground	Always	1 MΩ or higher

   TEXT IN ILLUSTRATION
   
   

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

NG → REPLACE INSTRUMENT PANEL WIRE 

OK: Go to next step 

1. Connect the connectors to the lower No. 1 instrument panel airbag and center airbag sensor.
   Fig 4: Checking 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 ignition switch to ON, and wait for at least 60 seconds.
4. Clear the DTCs. Refer to DTC CHECK / CLEAR .
5. Turn the ignition switch off.
6. Turn the ignition switch to ON, and wait for at least 60 seconds.
7. Check for DTCs. Refer to DTC CHECK / CLEAR .

   OK

   DTC B1860, B1861, B1862 or B1863 is not output.

   HINT: 

   Codes other than DTC B1860, B1861, B1862 and B1863 may be output at this time, but they are not related to this check.

   TEXT IN ILLUSTRATION
   
   

   *1	Driver Side Knee Squib
   *2	Center Airbag Sensor

NG → See step   7 

OK → See step   5