AIRBAG SYSTEM, Diagnostic DTC:B1653/35

DESCRIPTION

The seat position airbag sensor circuit consists of the airbag sensor assembly and seat position airbag sensor.

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

WIRING DIAGRAM

1. for LHD:

   

2. for RHD:

   

INSPECTION PROCEDURE

PROCEDURE

1. CHECK VEHICLE CONDITION

   
   

   1. Choose the model to be inspected.

      Result
      Result Proceed to for LHD A for RHD B

   
   

   B

   CHECK CONNECTORS Click here

   A

2. CHECK CONNECTORS

   
   

   1. Turn the engine 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, front seat inner belt assembly LH and seat position airbag sensor.

      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, 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.

   
   

   NG

   REPLACE WIRE HARNESS

   OK

3. CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT (OPEN)

   
   
   1. 

      Text in Illustration

      *1	Seat Position Airbag Sensor
      *2	Airbag Sensor Assembly
      *3	Service Wire
      *a	Front view of wire harness connector (to Airbag Sensor Assembly)
      *b	Front view of wire harness connector (to Seat Position Airbag Sensor)

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

   2. Using a service wire, connect terminals 9 (LSP+) and 17 (LSP-) of connector B.

      Note

      Do not forcibly insert the service wire 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

   
   

   NG

   CHECK FLOOR WIRE (OPEN) Click here

   OK

4. CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT (SHORT)

   
   
   1. 

      Text in Illustration

      *1	Seat Position Airbag Sensor
      *2	Airbag Sensor Assembly
      *a	Front view of wire harness connector (to Seat Position Airbag Sensor)

      Disconnect the service wire 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

   
   

   NG

   CHECK FLOOR WIRE (SHORT) Click here

   OK

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

   
   
   1. 

      Text in Illustration

      *1	Seat Position Airbag Sensor
      *2	Airbag Sensor Assembly
      *a	Front view of wire harness connector (to Seat Position Airbag Sensor)

      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 Condition Specified Condition 2 (LSP+) - Body ground Engine switch on (IG) Below 1 V 1 (LSP-) - Body ground Engine switch on (IG) Below 1 V

   4. Turn the engine 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.

   
   

   NG

   CHECK FLOOR WIRE (SHORT TO B+) Click here

   OK

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

   
   
   1. 

      Text in Illustration

      *1	Seat Position Airbag Sensor
      *2	Airbag Sensor Assembly
      *a	Front view of wire harness connector (to Seat Position Airbag Sensor)

      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

   
   

   NG

   CHECK FLOOR WIRE (SHORT TO GROUND) Click here

   OK

7. CHECK DTC

   
   
   1. 

      Text in Illustration

      *1	Seat Position Airbag Sensor
      *2	Airbag Sensor Assembly

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

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

   3. Clear the DTCs stored in memory Click here.

   4. Turn the engine switch off.

   5. Turn the engine 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.

   7. Turn the engine switch off.

   
   

   NG

   CHECK SEAT POSITION AIRBAG SENSOR Click here

   OK

   USE SIMULATION METHOD TO CHECK Click here

8. CHECK SEAT POSITION AIRBAG SENSOR

   
   
   1. 

      Text in Illustration

      *1	Seat Position Airbag Sensor
      *2	Airbag Sensor Assembly

      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.

   2. Replace the seat position airbag sensor with a known good one Click here.

      Tech Tips

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

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

   4. Clear the DTCs stored in memory Click here.

   5. Turn the engine switch off.

   6. Turn the engine 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.

   8. Turn the engine 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. Restore the seat position airbag sensor that was installed for testing to its original location Click here.

   
   

   NG

   REPLACE AIRBAG SENSOR ASSEMBLY Click here

   OK

   REPLACE SEAT POSITION AIRBAG SENSOR Click here

9. CHECK FLOOR WIRE (OPEN)

   
   
   1. 

      Text in Illustration

      *1	Seat Position Airbag Sensor
      *2	Airbag Sensor Assembly
      *3	Front Seat Inner Belt Assembly LH
      *4	Floor Wire
      *5	Service Wire
      *a	Front view of wire harness connector (to Airbag Sensor Assembly)
      *b	Front view of wire harness connector (to Front Seat Inner Belt Assembly LH)

      Disconnect the floor wire from the front seat inner belt assembly LH.

      Tech Tips

      The service wire 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 P20-4 (LSP+) - P20-3 (LSP-) Always Below 1 Ω

   3. Disconnect the service wire from the connector B.

   
   

   NG

   REPLACE FLOOR WIRE

   OK

   REPLACE FRONT SEAT INNER BELT ASSEMBLY LH Click here

10. CHECK FLOOR WIRE (SHORT)

    
    
    1. 

       Text in Illustration

       *1	Seat Position Airbag Sensor
       *2	Airbag Sensor Assembly
       *3	Front Seat Inner Belt Assembly LH
       *4	Floor Wire
       *a	Front view of wire harness connector (to Front Seat Inner Belt Assembly LH)

       Disconnect the 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 P20-4 (LSP+) - P20-3 (LSP-) Always 1 MΩ or higher

    
    

    NG

    REPLACE FLOOR WIRE

    OK

    REPLACE FRONT SEAT INNER BELT ASSEMBLY LH Click here

11. CHECK FLOOR WIRE (SHORT TO B+)

    
    
    1. 

       Text in Illustration

       *1	Seat Position Airbag Sensor
       *2	Airbag Sensor Assembly
       *3	Front Seat Inner Belt Assembly LH
       *4	Floor Wire
       *a	Front view of wire harness connector (to Front Seat Inner Belt Assembly LH)

       Disconnect the floor wire from the front seat inner belt assembly LH.

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

    3. Turn the engine switch on (IG).

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

       Standard Voltage
       Tester Connection Condition Specified Condition P20-4 (LSP+) - Body ground Engine switch on (IG) Below 1 V P20-3 (LSP-) - Body ground Engine switch on (IG) Below 1 V

    
    

    NG

    REPLACE FLOOR WIRE

    OK

    REPLACE FRONT SEAT INNER BELT ASSEMBLY LH Click here

12. CHECK FLOOR WIRE (SHORT TO GROUND)

    
    
    1. 

       Text in Illustration

       *1	Seat Position Airbag Sensor
       *2	Airbag Sensor Assembly
       *3	Front Seat Inner Belt Assembly LH
       *4	Floor Wire
       *a	Front view of wire harness connector (to Front Seat Inner Belt Assembly LH)

       Disconnect the 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 P20-4 (LSP+) - Body ground Always 1 MΩ or higher P20-3 (LSP-) - Body ground Always 1 MΩ or higher

    
    

    NG

    REPLACE FLOOR WIRE

    OK

    REPLACE FRONT SEAT INNER BELT ASSEMBLY LH Click here

13. CHECK CONNECTORS

    
    

    1. Turn the engine 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, front seat inner belt assembly RH and seat position airbag sensor.

       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, 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

14. CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT (OPEN)

    
    
    1. 

       Text in Illustration

       *1	Seat Position Airbag Sensor
       *2	Airbag Sensor Assembly
       *3	Service Wire
       *a	Front view of wire harness connector (to Airbag Sensor Assembly)
       *b	Front view of wire harness connector (to Seat Position Airbag Sensor)

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

    2. Using a service wire, connect terminals 16 (RSP+) and 24 (RSP-) of connector B.

       Note

       Do not forcibly insert the service wire 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

    
    

    NG

    CHECK NO. 2 FLOOR WIRE (OPEN) Click here

    OK

15. CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT (SHORT)

    
    
    1. 

       Text in Illustration

       *1	Seat Position Airbag Sensor
       *2	Airbag Sensor Assembly
       *a	Front view of wire harness connector (to Seat Position Airbag Sensor)

       Disconnect the service wire 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 NO. 2 FLOOR WIRE (SHORT) Click here

    OK

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

    
    
    1. 

       Text in Illustration

       *1	Seat Position Airbag Sensor
       *2	Airbag Sensor Assembly
       *a	Front view of wire harness connector (to Seat Position Airbag Sensor)

       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 Condition Specified Condition 2 (RSP+) - Body ground Engine switch on (IG) Below 1 V 1 (RSP-) - Body ground Engine switch on (IG) Below 1 V

    4. Turn the engine 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.

    
    

    NG

    CHECK NO. 2 FLOOR WIRE (SHORT TO B+) Click here

    OK

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

    
    
    1. 

       Text in Illustration

       *1	Seat Position Airbag Sensor
       *2	Airbag Sensor Assembly
       *a	Front view of wire harness connector (to Seat Position Airbag Sensor)

       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 NO. 2 FLOOR WIRE (SHORT TO GROUND) Click here

    OK

18. CHECK DTC

    
    
    1. 

       Text in Illustration

       *1	Seat Position Airbag Sensor
       *2	Airbag Sensor Assembly

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

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

    3. Clear the DTCs stored in memory Click here.

    4. Turn the engine switch off.

    5. Turn the engine 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.

    7. Turn the engine switch off.

    
    

    NG

    CHECK SEAT POSITION AIRBAG SENSOR Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here

19. CHECK SEAT POSITION AIRBAG SENSOR

    
    
    1. 

       Text in Illustration

       *1	Seat Position Airbag Sensor
       *2	Airbag Sensor Assembly

       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.

    2. Replace the seat position airbag sensor with a known good one Click here.

       Tech Tips

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

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

    4. Clear the DTCs stored in memory Click here.

    5. Turn the engine switch off.

    6. Turn the engine 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.

    8. Turn the engine 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. Restore the seat position airbag sensor that was installed for testing to its original location Click here.

    
    

    NG

    REPLACE AIRBAG SENSOR ASSEMBLY Click here

    OK

    REPLACE SEAT POSITION AIRBAG SENSOR Click here

20. CHECK NO. 2 FLOOR WIRE (OPEN)

    
    
    1. 

       Text in Illustration

       *1	Seat Position Airbag Sensor
       *2	Airbag Sensor Assembly
       *3	Front Seat Inner Belt Assembly RH
       *4	No. 2 Floor Wire
       *5	Service Wire
       *a	Front view of wire harness connector (to Airbag Sensor Assembly)
       *b	Front view of wire harness connector (to Front Seat Inner Belt Assembly RH)

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

       Tech Tips

       The service wire 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 Q32-4 (RSP+) - Q32-3 (RSP-) Always Below 1 Ω

    3. Disconnect the service wire from the connector B.

    
    

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

    REPLACE FRONT SEAT INNER BELT ASSEMBLY RH Click here

21. CHECK NO. 2 FLOOR WIRE (SHORT)

    
    
    1. 

       Text in Illustration

       *1	Seat Position Airbag Sensor
       *2	Airbag Sensor Assembly
       *3	Front Seat Inner Belt Assembly RH
       *4	No. 2 Floor Wire
       *a	Front view of wire harness connector (to Front Seat Inner Belt Assembly RH)

       Disconnect the No. 2 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 Q32-4 (RSP+) - Q32-3 (RSP-) Always 1 MΩ or higher

    
    

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

    REPLACE FRONT SEAT INNER BELT ASSEMBLY RH Click here

22. CHECK NO. 2 FLOOR WIRE (SHORT TO B+)

    
    
    1. 

       Text in Illustration

       *1	Seat Position Airbag Sensor
       *2	Airbag Sensor Assembly
       *3	Front Seat Inner Belt Assembly RH
       *4	No. 2 Floor Wire
       *a	Front view of wire harness connector (to Front Seat Inner Belt Assembly RH)

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

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

    3. Turn the engine switch on (IG).

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

       Standard Voltage
       Tester Connection Condition Specified Condition Q32-4 (RSP+) - Body ground Engine switch on (IG) Below 1 V Q32-3 (RSP-) - Body ground Engine switch on (IG) Below 1 V

    
    

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

    REPLACE FRONT SEAT INNER BELT ASSEMBLY RH Click here

23. CHECK NO. 2 FLOOR WIRE (SHORT TO GROUND)

    
    
    1. 

       Text in Illustration

       *1	Seat Position Airbag Sensor
       *2	Airbag Sensor Assembly
       *3	Front Seat Inner Belt Assembly RH
       *4	No. 2 Floor Wire
       *a	Front view of wire harness connector (to Front Seat Inner Belt Assembly RH)

       Disconnect the No. 2 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 Q32-4 (RSP+) - Body ground Always 1 MΩ or higher Q32-3 (RSP-) - Body ground Always 1 MΩ or higher

    
    

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

    REPLACE FRONT SEAT INNER BELT ASSEMBLY RH Click here