AIRBAG SYSTEM, Diagnostic DTC:B1900/73, B1901/73, B1902/73, B1903/73

DESCRIPTION

The front driver side pretensioner squib circuit consists of the center airbag sensor assembly and the front seat outer belt assembly (Driver side).

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

These DTCs are recorded when a malfunction is detected in the front driver side pretensioner squib circuit.

INSPECTION PROCEDURE

PROCEDURE

1. Click here

   CHECK CONNECTORS

   
   
   1. 

      Turn the ignition switch off.

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

   3. Check that the connectors are properly connected to the front seat outer belt assembly (Driver side) and center airbag sensor assembly.

      OK
      The connectors are properly connected.

      Tip:

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

   4. Disconnect the connectors from the front seat outer belt assembly (Driver side) and center airbag sensor assembly.

   5. Check that the connector terminals are not damaged.

      OK
      The terminals are not deformed or damaged.

   6. Check that the floor wire connector (on the front seat outer belt assembly (Driver side)) is not damaged.

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

      Result
      Result Proceed to OK A NG (for LHD) B NG (for RHD) C

   
   
   • AClick here
   • BClick here
   • CClick here
2. Click here

   CHECK FRONT SEAT OUTER BELT ASSEMBLY (FRONT DRIVER SIDE PRETENSIONER 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 seat outer belt assembly (Front driver side pretensioner 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.

      09843-18061

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

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

   8. Check for DTCs (Click here).

      OK
      DTC B1900, B1901, B1902, B1903, or 73 is not output.

      Tip:

      Codes other than DTC B1900, B1901, B1902, B1903, and 73 may be output at this time, but they are not related to this check.

   
   
   • OKClick here
   • NGClick here
3. Click here

   CHECK WIRE HARNESS (FRONT DRIVER SIDE PRETENSIONER SQUIB CIRCUIT)

   
   
   1. 

      Turn the ignition switch off.

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

      2. Turn the ignition switch on (IG).

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

         Standard voltage
         for LHD
         Tester Connection Switch Condition Specified Condition O4-1 (L+) - Body ground Ignition switch on (IG) Below 1 V O4-2 (L-) - Body ground Ignition switch on (IG) Below 1 V
         for RHD
         Tester Connection Switch Condition Specified Condition N4-1 (R+) - Body ground Ignition switch on (IG) Below 1 V N4-2 (R-) - Body ground Ignition switch on (IG) Below 1 V

         Result
         Result Proceed to OK A NG (for LHD) B NG (for RHD) C

   6. Check for an 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
         for LHD
         Tester Connection Switch Condition Specified Condition O4-1 (L+) - O4-2 (L-) Always Below 1 Ω
         for RHD
         Tester Connection Switch Condition Specified Condition N4-1 (R+) - N4-2 (R-) Always Below 1 Ω

         Result
         Result Proceed to OK A NG (for LHD) B NG (for RHD) C

   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
         for LHD
         Tester Connection Switch Condition Specified Condition O4-1 (L+) - Body ground Always 1 MΩ or higher O4-2 (L-) - Body ground Always 1 MΩ or higher
         for RHD
         Tester Connection Switch Condition Specified Condition N4-1 (R+) - Body ground Always 1 MΩ or higher N4-2 (R-) - Body ground Always 1 MΩ or higher

         Result
         Result Proceed to OK A NG (for LHD) B NG (for RHD) C

   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
         for LHD
         Tester Connection Switch Condition Specified Condition O4-1 (L+) - O4-2 (L-) Always 1 MΩ or higher
         for RHD
         Tester Connection Switch Condition Specified Condition N4-1 (R+) - N4-2 (R-) Always 1 MΩ or higher

         Result
         Result Proceed to OK A NG (for LHD) B NG (for RHD) C

   
   
   • AClick here
   • BClick here
   • CClick here
4. Click here

   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 seat outer belt assembly (Driver side) and the center airbag sensor assembly.

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

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

   8. Check for DTCs (Click here).

      OK
      DTC B1900, B1901, B1902, B1903, or 73 is not output.

      Tip:

      Codes other than DTC B1900, B1901, B1902, B1903, and 73 may be output at this time, but they are not related to this check.

   
   
   • OKClick here
   • NGClick here
5. Click here

   REPLACE FLOOR WIRE NO. 2

6. Click here

   REPLACE FLOOR WIRE

7. Click here

   REPLACE FRONT SEAT OUTER BELT ASSEMBLY (DRIVER SIDE)Click here

8. Click here

   REPLACE CENTER AIRBAG SENSOR ASSEMBLYClick here

9. Click here

   USE SIMULATION METHOD TO CHECKClick here