AIRBAG SYSTEM, Diagnostic DTC:B1620/21

DESCRIPTION

The side collision sensor RH circuit (to determine deployment of the front seat airbag assembly RH, curtain shield airbag assembly RH* and front seat outer belt assembly RH) is composed of the airbag sensor assembly, side airbag sensor assembly RH and rear airbag sensor RH*.

The side airbag sensor assembly RH and rear airbag sensor RH* detect impacts to the vehicle and send signals to the airbag sensor assembly to determine if the airbags and pretensioner should be deployed.

DTC B1620/21 is stored when a malfunction is detected in the side collision sensor RH circuit.

• *: w/ Curtain Shield Airbags

WIRING DIAGRAM

1. w/o Curtain Shield Airbags

   

   *a	Side Airbag Sensor Assembly RH
   *b	Airbag Sensor Assembly

2. w/ Curtain Shield Airbags

   

   *a	Side Airbag Sensor Assembly RH
   *b	Rear Airbag Sensor RH
   *c	Airbag Sensor Assembly

CAUTION / NOTICE / HINT

PROCEDURE

1. CHECK VEHICLE CONDITION

   
   

   1. Choose the model to be inspected.

      Result
      Result Proceed to w/o Curtain Shield Airbags A w/ Curtain Shield Airbags B

   
   

   B

   CHECK CONNECTORS Click here

   A

2. CHECK CONNECTORS

   
   

   1. Turn the ignition switch off.

   2. Disconnect the cable from the negative (-) battery terminal.

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

   3. Check that the connectors are properly connected to the airbag sensor assembly and side airbag sensor assembly RH.

      OK
      The connectors are properly connected.

      Tech Tips

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

   4. Disconnect the connectors from the airbag sensor assembly and side airbag sensor assembly RH.

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

      OK
      The terminals are not deformed or damaged.

      Result
      Proceed to OK NG

   
   

   NG

   REPLACE FLOOR WIRE

   OK

3. CHECK FLOOR WIRE (OPEN)

   
   
   1. 

      *1	Side Airbag Sensor Assembly RH
      *2	Airbag Sensor Assembly
      *3	Floor Wire
      *4	Service Wire
      *a	Front view of wire harness connector (to Airbag Sensor Assembly)
      *b	Front view of wire harness connector (to Side Airbag Sensor Assembly RH)

      Using a service wire, connect terminals 8 (BBR+) and 11 (BBR-) of connector B.

      Note

      Do not forcibly insert the service wire into the terminals of the connector when connecting the wire.

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

      Standard Resistance
      Tester Connection Condition Specified Condition L59-2 (BBR+) - L59-1 (BBR-) Always Below 1 Ω

   3. Disconnect the service wire from connector B.

      Result
      Proceed to OK NG

   
   

   NG

   REPLACE FLOOR WIRE

   OK

4. CHECK FLOOR WIRE (SHORT)

   
   
   1. 

      *1	Side Airbag Sensor Assembly RH
      *2	Airbag Sensor Assembly
      *3	Floor Wire
      *a	Front view of wire harness connector (to Side Airbag Sensor Assembly RH)

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

      Standard Resistance
      Tester Connection Condition Specified Condition L59-2 (BBR+) - L59-1 (BBR-) Always 1 MΩ or higher

      Result
      Proceed to OK NG

   
   

   NG

   REPLACE FLOOR WIRE

   OK

5. CHECK FLOOR WIRE (SHORT TO B+)

   
   
   1. 

      *1	Side Airbag Sensor Assembly RH
      *2	Airbag Sensor Assembly
      *3	Floor Wire
      *a	Front view of wire harness connector (to Side Airbag Sensor Assembly RH)

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

   2. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Condition Specified Condition L59-2 (BBR+) - Body ground Ignition switch ON Below 1 V L59-1 (BBR-) - Body ground Ignition switch ON Below 1 V

   4. Turn the ignition switch off.

   5. Disconnect the cable from the negative (-) battery terminal.

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

      Result
      Proceed to OK NG

   
   

   NG

   REPLACE FLOOR WIRE

   OK

6. CHECK FLOOR WIRE (SHORT TO GROUND)

   
   
   1. 

      *1	Side Airbag Sensor Assembly RH
      *2	Airbag Sensor Assembly
      *3	Floor Wire
      *a	Front view of wire harness connector (to Side Airbag Sensor Assembly RH)

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

      Standard Resistance
      Tester Connection Condition Specified Condition L59-2 (BBR+) - Body ground Always 1 MΩ or higher L59-1 (BBR-) - Body ground Always 1 MΩ or higher

      Result
      Proceed to OK NG

   
   

   NG

   REPLACE FLOOR WIRE

   OK

7. CHECK SIDE AIRBAG SENSOR ASSEMBLY RH

   
   
   1. 

      *1	Side Airbag Sensor Assembly LH
      *2	Airbag Sensor Assembly

      Connect the connector to the airbag sensor assembly.

   2. Interchange the side airbag sensor assembly RH with LH and connect the connectors.

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

   4. Clear the DTCs stored in memory.

      Click here

      
      Body Electrical > SRS Airbag > Clear DTCs

   5. Turn the ignition switch off.

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

   7. Check for DTCs.

      Click here

      
      Body Electrical > SRS Airbag > Trouble Codes

      Tech Tips

      Codes other than DTCs B1620/21 and B1625/22 may be output at this time, but they are not related to this check.

      Result
      Result Proceed to DTC B1620/21 is output. A DTC B1625/22 is output. B DTCs B1620/21 and B1625/22 are not output. C

   8. Turn the ignition switch off.

   9. Disconnect the cable from the negative (-) battery terminal.

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

   10. Return the side airbag sensor assembly RH and LH to their original positions and connect the connectors.

   
   

   A

   REPLACE AIRBAG SENSOR ASSEMBLY Click here

   B

   REPLACE SIDE AIRBAG SENSOR ASSEMBLY RH Click here

   C

   USE SIMULATION METHOD TO CHECK Click here

8. CHECK CONNECTORS

   
   

   1. Turn the ignition switch off.

   2. Disconnect the cable from the negative (-) battery terminal.

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

   3. Check that the connectors are properly connected to the airbag sensor assembly, side airbag sensor assembly RH and rear airbag sensor RH.

      OK
      The connectors are properly connected.

      Tech Tips

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

   4. Disconnect the connectors from the airbag sensor assembly, side airbag sensor assembly RH and rear airbag sensor RH.

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

      OK
      The terminals are not deformed or damaged.

      Result
      Proceed to OK NG

   
   

   NG

   REPLACE FLOOR WIRE

   OK

9. CHECK FLOOR WIRE (OPEN)

   
   
   1. 

      *1	Side Airbag Sensor Assembly RH
      *2	Airbag Sensor Assembly
      *3	Floor Wire
      *4	Service Wire
      *a	Front view of wire harness connector (to Airbag Sensor Assembly)
      *b	Front view of wire harness connector (to Side Airbag Sensor Assembly RH)

      Using a service wire, connect terminals 8 (BBR+) and 11 (BBR-) of connector B.

      Note

      Do not forcibly insert the service wire into the terminals of the connector when connecting the wire.

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

      Standard Resistance
      Tester Connection Condition Specified Condition L29-4 (BBR+) - L29-3 (BBR-) Always Below 1 Ω

   3. Disconnect the service wire from connector B.

      Result
      Proceed to OK NG

   
   

   NG

   REPLACE FLOOR WIRE

   OK

10. CHECK FLOOR WIRE (SHORT)

    
    
    1. 

       *1	Side Airbag Sensor Assembly RH
       *2	Airbag Sensor Assembly
       *3	Floor Wire
       *a	Front view of wire harness connector (to Side Airbag Sensor Assembly RH)

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

       Standard Resistance
       Tester Connection Condition Specified Condition L29-4 (BBR+) - L29-3 (BBR-) Always 1 MΩ or higher

       Result
       Proceed to OK NG

    
    

    NG

    REPLACE FLOOR WIRE

    OK

11. CHECK FLOOR WIRE (SHORT TO B+)

    
    
    1. 

       *1	Side Airbag Sensor Assembly RH
       *2	Airbag Sensor Assembly
       *3	Floor Wire
       *a	Front view of wire harness connector (to Side Airbag Sensor Assembly RH)

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

    2. Turn the ignition switch to ON.

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

       Standard Voltage
       Tester Connection Condition Specified Condition L29-4 (BBR+) - Body ground Ignition switch ON Below 1 V L29-3 (BBR-) - Body ground Ignition switch ON Below 1 V

    4. Turn the ignition switch off.

    5. Disconnect the cable from the negative (-) battery terminal.

       CAUTION:

       Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

       Result
       Proceed to OK NG

    
    

    NG

    REPLACE FLOOR WIRE

    OK

12. CHECK FLOOR WIRE (SHORT TO GROUND)

    
    
    1. 

       *1	Side Airbag Sensor Assembly RH
       *2	Airbag Sensor Assembly
       *3	Floor Wire
       *a	Front view of wire harness connector (to Side Airbag Sensor Assembly RH)

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

       Standard Resistance
       Tester Connection Condition Specified Condition L29-4 (BBR+) - Body ground Always 1 MΩ or higher L29-3 (BBR-) - Body ground Always 1 MΩ or higher

       Result
       Proceed to OK NG

    
    

    NG

    REPLACE FLOOR WIRE

    OK

13. CHECK FLOOR WIRE (OPEN)

    
    
    1. 

       *1	Rear Airbag Sensor RH
       *2	Side Airbag Sensor Assembly RH
       *3	Floor Wire
       *4	Service Wire
       *a	Front view of wire harness connector (to Side Airbag Sensor Assembly RH)
       *b	Front view of wire harness connector (to Rear Airbag Sensor RH)

       Using a service wire, connect terminals 2 (BCR+) and 1 (BCR-) of connector C.

       Note

       Do not forcibly insert the service wire into the terminals of the connector when connecting the wire.

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

       Standard Resistance
       Tester Connection Condition Specified Condition L29-1 (BCR+) - L29-2 (BCR-) Always Below 1 Ω

    3. Disconnect the service wire from connector C.

       Result
       Proceed to OK NG

    
    

    NG

    REPLACE FLOOR WIRE

    OK

14. CHECK FLOOR WIRE (SHORT)

    
    
    1. 

       *1	Rear Airbag Sensor RH
       *2	Side Airbag Sensor Assembly RH
       *3	Floor Wire
       *a	Front view of wire harness connector (to Side Airbag Sensor Assembly RH)

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

       Standard Resistance
       Tester Connection Condition Specified Condition L29-1 (BCR+) - L29-2 (BCR-) Always 1 MΩ or higher

       Result
       Proceed to OK NG

    
    

    NG

    REPLACE FLOOR WIRE

    OK

15. CHECK FLOOR WIRE (SHORT TO B+)

    
    
    1. 

       *1	Rear Airbag Sensor RH
       *2	Side Airbag Sensor Assembly RH
       *3	Floor Wire
       *a	Front view of wire harness connector (to Side Airbag Sensor Assembly RH)

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

    2. Turn the ignition switch to ON.

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

       Standard Voltage
       Tester Connection Condition Specified Condition L29-1 (BCR+) - Body ground Ignition switch ON Below 1 V L29-2 (BCR-) - Body ground Ignition switch ON Below 1 V

    4. Turn the ignition switch off.

    5. Disconnect the cable from the negative (-) battery terminal.

       CAUTION:

       Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

       Result
       Proceed to OK NG

    
    

    NG

    REPLACE FLOOR WIRE

    OK

16. CHECK FLOOR WIRE (SHORT TO GROUND)

    
    
    1. 

       *1	Rear Airbag Sensor RH
       *2	Side Airbag Sensor Assembly RH
       *3	Floor Wire
       *a	Front view of wire harness connector (to Side Airbag Sensor Assembly RH)

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

       Standard Resistance
       Tester Connection Condition Specified Condition L29-1 (BCR+) - Body ground Always 1 MΩ or higher L29-2 (BCR-) - Body ground Always 1 MΩ or higher

       Result
       Proceed to OK NG

    
    

    NG

    REPLACE FLOOR WIRE

    OK

17. CHECK SIDE AIRBAG SENSOR ASSEMBLY RH

    
    
    1. 

       *1	Side Airbag Sensor Assembly LH
       *2	Airbag Sensor Assembly

       Connect the connectors to the rear airbag sensor RH and airbag sensor assembly.

    2. Interchange the side airbag sensor assembly RH with LH and connect the connectors.

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

    4. Clear the DTCs stored in memory.

       Click here

       
       Body Electrical > SRS Airbag > Clear DTCs

    5. Turn the ignition switch off.

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

    7. Check for DTCs.

       Click here

       
       Body Electrical > SRS Airbag > Trouble Codes

       Tech Tips

       Codes other than DTCs B1620/21 and B1625/22 may be output at this time, but they are not related to this check.

       Result
       Result Proceed to DTC B1620/21 is output. A DTC B1625/22 is output. B DTCs B1620/21 and B1625/22 are not output. C

    8. Turn the ignition switch off.

    9. Disconnect the cable from the negative (-) battery terminal.

       CAUTION:

       Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

    10. Return the side airbag sensor assembly RH and LH to their original positions and connect the connectors.

    
    

    B

    REPLACE SIDE AIRBAG SENSOR ASSEMBLY RH Click here

    C

    USE SIMULATION METHOD TO CHECK Click here

    A

18. CHECK REAR AIRBAG SENSOR RH

    
    
    1. 

       *1	Rear Airbag Sensor RH
       *2	Side Airbag Sensor Assembly RH

       Disconnect the connector from the rear airbag sensor RH.

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

    3. Clear the DTCs stored in memory.

       Click here

       
       Body Electrical > SRS Airbag > Clear DTCs

    4. Turn the ignition switch off.

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

    6. Check for DTCs.

       Click here

       
       Body Electrical > SRS Airbag > Trouble Codes

       OK
       DTC B1620/21 is not output.

       Tech Tips

       Codes other than DTC B1620/21 may be output at this time, but they are not related to this check.

       Result
       Proceed to OK NG

    
    

    OK

    REPLACE REAR AIRBAG SENSOR RH Click here

    NG

    REPLACE AIRBAG SENSOR ASSEMBLY Click here