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

for Preparation Click here

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT:

1. Perform the simulation method by selecting CHECK MODE (signal check) with the intelligent tester (Click here).
   
2. After selecting 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 (Click here).
   

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 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 knee airbag assembly.
   

5. Check that the instrument panel wire connector (on the 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

SST

09843-18061  

1. Connect the white wire side of SST (resistance 2.1 Ω) to connector C.
   

   CAUTION:

   Never connect a tester to the knee airbag assembly (knee airbag squib) for measurement, as this may lead to a serious injury due to airbag deployment.

   NOTICE:

   1. Do not forcibly insert SST into the terminals of the connector when connecting.
      
   2. 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 (Click here).
   

5. Turn the ignition switch off.
   

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

7. Check the DTCs (Click here).
   

   OK:

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

   Text in Illustration 

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

   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	Go to step 3

OK
REPLACE KNEE AIRBAG ASSEMBLY (Click here)

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

1. Disconnect the connectors from the center airbag sensor assembly.
   

2. Check for short to B+ in the circuit.
   

   1. Connect the negative (-) terminal cable to the battery, 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
      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	Knee Airbag Squib
      *2	Instrument Panel Wire
      *3	Center Airbag Sensor Assembly
      *4	Front view of wire harness connector (to Knee Airbag Squib)
      *5	Connector C

3. Check for open in the circuit.
   

   1. Turn the ignition switch off.
      

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

   3. 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

4. Check for short to ground in the circuit.
   

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

      Standard Resistance:

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

5. Check for short in the circuit.
   

   1. Release the activation prevention mechanism built into connector B (Click here).
      

   2. 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

NG	REPLACE INSTRUMENT PANEL WIRE

OK

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

2. Connect the connectors to the knee airbag assembly and the center airbag sensor assembly.
   

3. Connect the negative (-) terminal cable to the battery, 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 stored in the memory (Click here).
   

6. Turn the ignition switch off.
   

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

8. Check the DTCs (Click here).
   

   OK:

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

   Text in Illustration 

   *1	Knee Airbag Squib
   *2	Center Airbag Sensor Assembly

   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	REPLACE CENTER AIRBAG SENSOR ASSEMBLY (Click here)

OK
USE SIMULATION METHOD TO CHECK (Click here)