AIRBAG SYSTEM, Diagnostic DTC:B1865/65, B1866/65, B1867/65, B1868/65

DESCRIPTION

The front passenger side knee airbag squib circuit consists of the center airbag sensor assembly and the front passenger side knee airbag assembly.

This circuit instructs SRS to deploy when deployment conditions are met.

These DTCs are recorded when a malfunction is detected in the front passenger side knee airbag squib circuit.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. CHECK CONNECTORS

   
   

   1. 

      Turn the engine switch off.

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

   3. Check that the connectors are properly connected to the front passenger side knee airbag assembly and center airbag sensor assembly.

      OK
      The connectors are properly connected.

      Tech Tips

      If the connectors are not connected securely, reconnect the connectors and proceed to the next inspection.

   4. Disconnect the connectors from the front passenger side knee airbag assembly and center airbag sensor assembly.

   5. Check that the terminals of the connectors are not damaged.

      OK
      The terminals are not deformed or damaged.

   6. Check that the instrument panel wire connector (on the front passenger 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.

   7. Check that the short spring for the instrument panel wire 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

2. CHECK FRONT PASSENGER SIDE KNEE AIRBAG ASSEMBLY (FRONT PASSENGER SIDE KNEE AIRBAG SQUIB)

   
   

   1. 

      Connect the connector to the center airbag sensor assembly.

   2. Connect SST (resistance 2.1 Ω) to connector C.

      CAUTION:

      Never connect the tester to the front passenger side knee airbag assembly (front passenger 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.

      SST

      09843-18061

   3. Connect the cable to the negative (-) battery terminal.

   4. Turn the engine switch on (IG), and wait for at least 60 seconds.

   5. Clear the DTCs stored in the memory Click here.

   6. Turn the engine switch off.

   7. Turn the engine switch on (IG), and wait for at least 60 seconds.

   8. Check for DTCs Click here.

      OK
      DTC B1865, B1866, B1867, B1868, or 65 is not output.

      Tech Tips

      Codes other than DTC B1865, B1866, B1867, B1868, and 65 may be output at this time, but they are not related to this check.

   
   

   NG

   CHECK INSTRUMENT PANEL WIRE (FRONT PASSENGER SIDE KNEE AIRBAG SQUIB CIRCUIT) Click here

   OK

   REPLACE FRONT PASSENGER SIDE KNEE AIRBAG ASSEMBLY Click here

3. CHECK INSTRUMENT PANEL WIRE (FRONT PASSENGER SIDE KNEE AIRBAG SQUIB CIRCUIT)

   
   

   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. Disconnect the connector from the center airbag sensor assembly.

   5. Check for a short to B+ in the circuit.

      
      

      1. Connect the cable to the negative (-) battery terminal.

      2. Turn the engine switch on (IG).

      3. Measure the voltage according to the value(s) in the table below.

         Standard Voltage
         Tester Connection Switch Condition Specified Condition J79-1 (PK+) - Body ground Engine switch on (IG) Below 1 V J79-2 (PK-) - Body ground Engine switch on (IG) Below 1 V

   6. Check for an open in the circuit.

      
      

      1. Turn the engine switch off.

      2. Disconnect the cable from the negative (-) battery terminal, 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 J79-1 (PK+) - J79-2 (PK-) Always Below 1 Ω

   7. Check for a 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 J79-1 (PK+) - Body ground Always 1 MΩ or higher J79-2 (PK-) - Body ground Always 1 MΩ or higher

   8. Check for a 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 J79-1 (PK+) - J79-2 (PK-) Always 1 MΩ or higher

   
   

   NG

   REPLACE INSTRUMENT PANEL WIRE

   OK

4. CHECK CENTER AIRBAG SENSOR ASSEMBLY

   
   

   1. 

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

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

   3. Connect the cable to the negative (-) battery terminal.

   4. Turn the engine switch on (IG), and wait for at least 60 seconds.

   5. Clear the DTCs stored in the memory Click here

   6. Turn the engine switch off.

   7. Turn the engine switch on (IG), and wait for at least 60 seconds.

   8. Check for DTCs Click here.

      OK
      DTC B1865, B1866, B1867, B1868, or 65 is not output.

      Tech Tips

      Codes other than DTC B1865, B1866, B1867, B1868, and 65 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