AIRBAG SYSTEM, Diagnostic DTC:B1653/35

DESCRIPTION

The seat position airbag sensor circuit consists of the center airbag sensor assembly, front seat inner belt assembly (driver side) and seat position airbag sensor.

DTC B1653/35 is stored when a malfunction is detected in the seat position airbag sensor circuit.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. CHECK CONNECTORS

   
   

   1. for LHD:

      
      

      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 connectors are properly connected to the center airbag sensor assembly, front seat inner belt assembly LH and seat position airbag sensor.

         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 center airbag sensor assembly, front seat inner belt assembly LH and seat position airbag sensor.

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

         OK
         The terminals are not deformed or damaged.

   2. for RHD:

      
      

      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 connectors are properly connected to the center airbag sensor assembly, front seat inner belt assembly RH and seat position airbag sensor.

         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 center airbag sensor assembly, front seat inner belt assembly RH and seat position airbag sensor.

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

         OK
         The terminals are not deformed or damaged.

   
   

   NG

   REPLACE WIRE HARNESS

   OK

2. CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT (OPEN)

   
   

   1. for LHD:

      
      

      1. Connect the connectors to the front seat inner belt assembly LH and No. 2 floor wire.

         

      2. Using SST, connect terminals 14 (LSP+) and 13 (LSP-) of connector B.

         Note

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

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

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

      SST

      09843-18040

   2. for RHD:

      
      

      1. Connect the connectors to the front seat inner belt assembly RH and floor wire.

         

      2. Using SST, connect terminals 12 (RSP+) and 13 (RSP-) of connector B.

         Note

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

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

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

      SST

      09843-18040

   
   

   NG

   CHECK WIRE HARNESS (OPEN) Click here

   OK

3. CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT (SHORT)

   
   

   1. for LHD:

      
      

      1. Disconnect SST from connector B.

         

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

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

   2. for RHD:

      
      

      1. Disconnect SST from connector B.

         

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

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

   
   

   NG

   CHECK WIRE HARNESS (SHORT) Click here

   OK

4. CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT (SHORT TO B+)

   
   

   1. for LHD:

      
      

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

         

      2. Turn the ignition switch on (IG).

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

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

   2. for RHD:

      
      

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

         

      2. Turn the ignition switch on (IG).

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

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

   
   

   NG

   CHECK WIRE HARNESS (SHORT TO B+) Click here

   OK

5. CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT (SHORT TO GROUND)

   
   

   1. for LHD:

      
      

      1. Turn the ignition 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 2 (LSP+) - Body ground Always 1 MΩ or higher 1 (LSP-) - Body ground Always 1 MΩ or higher

   2. for RHD:

      
      

      1. Turn the ignition 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 2 (RSP+) - Body ground Always 1 MΩ or higher 1 (RSP-) - Body ground Always 1 MΩ or higher

   
   

   NG

   CHECK WIRE HARNESS (SHORT TO GROUND) Click here

   OK

6. CHECK SEAT POSITION AIRBAG SENSOR

   
   

   1. for LHD:

      
      

      1. Connect the connectors to the center airbag sensor assembly and seat position airbag sensor.

         

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

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

      7. Check for DTCs Click here.

         OK
         DTC B1653/35 is not output.

         Tech Tips

         Codes other than DTC B1653/35 may be output at this time, but they are not related to this check.

   2. for RHD:

      
      

      1. Connect the connectors to the center airbag sensor assembly and seat position airbag sensor.

         

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

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

      7. Check for DTCs Click here.

         OK
         DTC B1653/35 is not output.

         Tech Tips

         Codes other than DTC B1653/35 may be output at this time, but they are not related to this check.

   
   

   NG

   REPLACE SEAT POSITION AIRBAG SENSOR Click here

   OK

   USE SIMULATION METHOD TO CHECK Click here

7. REPLACE SEAT POSITION AIRBAG SENSOR

   
   

   1. Turn the ignition switch off.

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

   3. Replace the seat position airbag sensor with a known good part Click here.

      Tech Tips

      Perform the following inspection using known good parts from another vehicle if possible.

   
   

   NEXT

8. CHECK CENTER AIRBAG SENSOR ASSEMBLY

   
   

   1. for LHD:

      
      

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

         

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

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

      4. Turn the ignition switch off.

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

      6. Check for DTCs Click here.

         OK
         DTC B1653/35 is not output.

         Tech Tips

         Codes other than DTC B1653/35 may be output at this time, but they are not related to this check.

   2. for RHD:

      
      

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

         

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

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

      4. Turn the ignition switch off.

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

      6. Check for DTCs Click here.

         OK
         DTC B1653/35 is not output.

         Tech Tips

         Codes other than DTC B1653/35 may be output at this time, but they are not related to this check.

   
   

   NG

   REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here

   OK

   END

9. CHECK WIRE HARNESS (OPEN)

   
   

   1. for LHD:

      
      

      1. Disconnect the No. 2 floor wire from the front seat inner belt assembly LH.

         

         Tech Tips

         SST has already been inserted into connector B.

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

         Standard Resistance
         Tester Connection Condition Specified Condition O10-2 (LSP+) - O10-4 (LSP-) Always Below 1 Ω
         Result Result Proceed to OK A NG B

   2. for RHD:

      
      

      1. Disconnect the floor wire from the front seat inner belt assembly RH.

         

         Tech Tips

         SST has already been inserted into connector B.

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

         Standard Resistance
         Tester Connection Condition Specified Condition N19-2 (RSP+) - N19-4 (RSP-) Always Below 1 Ω
         Result Result Proceed to OK C NG D

   
   

   B

   REPLACE NO. 2 FLOOR WIRE

   C

   REPLACE FRONT SEAT INNER BELT ASSEMBLY RH Click here

   D

   REPLACE FLOOR WIRE

   A

   REPLACE FRONT SEAT INNER BELT ASSEMBLY LH Click here

10. CHECK WIRE HARNESS (SHORT)

    
    

    1. for LHD:

       
       

       1. Disconnect the No. 2 floor wire from the front seat belt inner belt assembly LH.

          

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

          Standard Resistance
          Tester Connection Condition Specified Condition O10-2 (LSP+) - O10-4 (LSP-) Always 1 MΩ or higher
          Result Result Proceed to OK A NG B

    2. for RHD:

       
       

       1. Disconnect the floor wire from the front seat belt inner belt assembly RH.

          

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

          Standard Resistance
          Tester Connection Condition Specified Condition N19-2 (RSP+) - N19-4 (RSP-) Always 1 MΩ or higher
          Result Result Proceed to OK C NG D

    
    

    B

    REPLACE NO. 2 FLOOR WIRE

    C

    REPLACE FRONT SEAT INNER BELT ASSEMBLY RH Click here

    D

    REPLACE FLOOR WIRE

    A

    REPLACE FRONT SEAT INNER BELT ASSEMBLY LH Click here

11. CHECK WIRE HARNESS (SHORT TO B+)

    
    

    1. for LHD:

       
       

       1. Turn the ignition switch off.

          

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

       3. Disconnect the No. 2 floor wire from the front seat inner belt assembly LH.

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

       5. Turn the ignition switch on (IG).

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

          Standard Voltage
          Tester Connection Switch Condition Specified Condition O10-2 (LSP+) - Body ground Ignition switch on (IG) Below 1 V O10-4 (LSP-) - Body ground Ignition switch on (IG) Below 1 V
          Result Result Proceed to OK A NG B

    2. for RHD:

       
       

       1. Turn the ignition switch off.

          

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

       3. Disconnect the floor wire from the front seat inner belt assembly RH.

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

       5. Turn the ignition switch on (IG).

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

          Standard Voltage
          Tester Connection Switch Condition Specified Condition N19-2 (RSP+) - Body ground Ignition switch on (IG) Below 1 V N19-4 (RSP-) - Body ground Ignition switch on (IG) Below 1 V
          Result Result Proceed to OK C NG D

    
    

    B

    REPLACE NO. 2 FLOOR WIRE

    C

    REPLACE FRONT SEAT INNER BELT ASSEMBLY RH Click here

    D

    REPLACE FLOOR WIRE

    A

    REPLACE FRONT SEAT INNER BELT ASSEMBLY LH Click here

12. CHECK WIRE HARNESS (SHORT TO GROUND)

    
    

    1. for LHD:

       
       

       1. Disconnect the No. 2 floor wire from the front seat inner belt assembly LH.

          

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

          Standard Resistance
          Tester Connection Condition Specified Condition O10-2 (LSP+) - Body ground Always 1 MΩ or higher O10-4 (LSP-) - Body ground Always 1 MΩ or higher
          Result Result Proceed to OK A NG B

    2. for RHD:

       
       

       1. Disconnect the floor wire from the front seat inner belt assembly RH.

          

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

          Standard Resistance
          Tester Connection Condition Specified Condition N19-2 (RSP+) - Body ground Always 1 MΩ or higher N19-4 (RSP-) - Body ground Always 1 MΩ or higher
          Result Result Proceed to OK C NG D

    
    

    B

    REPLACE NO. 2 FLOOR WIRE

    C

    REPLACE FRONT SEAT INNER BELT ASSEMBLY RH Click here

    D

    REPLACE FLOOR WIRE

    A

    REPLACE FRONT SEAT INNER BELT ASSEMBLY LH Click here