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.
2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
3. Check that the connector is properly connected to the driver side knee airbag assembly.

   OK

   The connector is properly connected.

   HINT: 

   If the connector is not connected securely, reconnect the connector and proceed to the next inspection.

4. Disconnect the connector from the driver side knee airbag assembly.
5. Check that the instrument panel wire connector (on the driver side knee airbag assembly side) is not damaged.

   OK

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

NG → REPLACE INSTRUMENT PANEL WIRE 

OK: Go to next step 

• SST: 09843-18061 

1. Connect SST (resistance 2.1 Ω) to connector C.
   Fig 1: Checking Driver Side Knee Airbag Assembly (Driver Side Knee Airbag Squib)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   WARNING:

   Never connect a tester to the driver side knee airbag assembly (driver side knee airbag 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.
   • Insert SST straight into the terminals of the connector.
2. Connect the negative (-) terminal cable to the battery, 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 stored in the memory. 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 the DTCs. Refer to DTC CHECK / CLEAR .

   OK

   DTC B1860, B1861, B1862, B1863 or 64 is not output.

   TEXT IN ILLUSTRATION
   
   

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

   HINT: 

   DTCs other than B1860, B1861, B1862, B1863 and 64 may be output at this time, but they are not related to this check.

NG → See step   3 

OK → See step   7 

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. Check that the connector is properly connected to the center airbag sensor assembly.

   OK

   The connector is properly connected.

   HINT: 

   If the connector is not connected securely, reconnect the connector and proceed to the next inspection.

5. Disconnect the connector from the center airbag sensor assembly.
6. Check that the terminal of the connector is not damaged.

   OK

   The terminal is not deformed or damaged.

7. Check that the short spring for the instrument panel wire connector with the activation prevention mechanism is not deformed or damaged.

   OK

   The short spring is not deformed or damaged.

NG → REPLACE INSTRUMENT PANEL WIRE 

OK: Go to next step 

1. Disconnect the connectors from the center airbag sensor assembly.
   Fig 2: Checking Instrument Panel Wire (Driver Side Knee Airbag Squib - Center Airbag Sensor Assembly)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
3. Turn the ignition switch to ON.
4. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   D46-1 (DK+) - Body ground	Ignition switch ON	Below 1 V
   D46-2 (DK-) - Body ground	Ignition switch ON	Below 1 V

   TEXT IN ILLUSTRATION
   
   

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

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D46-1 (DK+) - D46-2 (DK-)	Always	Below 1 Ω

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D46-1 (DK+) - D46-2 (DK-)	Always	1 MΩ or higher
   D46-1 (DK+) - Body ground	Always	1 MΩ or higher
   D46-2 (DK-) - Body ground	Always	1 MΩ or higher

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

NG → REPLACE INSTRUMENT PANEL WIRE 

OK: Go to next step 

1. Connect the connectors to the driver side knee airbag assembly and the center airbag sensor assembly.
2. Connect the negative (-) terminal cable to the battery, 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 stored in the memory. 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 the DTCs. Refer to DTC CHECK / CLEAR .

   OK

   DTC B1860, B1861, B1862, B1863 or 64 is not output.

   HINT: 

   DTCs other than B1860, B1861, B1862, B1863 and 64 may be output at this time, but they are not related to this check.

NG → See step   8 

OK → See step   6