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:

   

   *a	Seat Position Airbag Sensor
   *b	Front Seat Inner Belt Assembly LH
   *c	Airbag Sensor Assembly

2. for RHD:

   

CAUTION / NOTICE / HINT

PROCEDURE

1. CHECK VEHICLE CONDITION

   
   

   1. Check vehicle condition.

      Result
      Result Proceed to LHD A RHD B

   
   

   B

   CHECK CONNECTORS Click here

   A

2. CHECK CONNECTORS

   
   

   1. Turn the power switch off.

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

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary 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.

      Result
      Proceed to OK NG

   
   

   NG

   REPLACE WIRE HARNESS

   OK

3. CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT (OPEN)

   
   
   1. 

      *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 No. 2 floor wire.

   2. Using a service wire, connect terminals 16 (LSP+) and 24 (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

      Result
      Proceed to OK NG

   
   

   NG

   CHECK NO. 2 FLOOR WIRE (OPEN) Click here

   OK

4. CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT (SHORT)

   
   
   1. 

      *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

      Result
      Result OK NG

   
   

   NG

   CHECK NO. 2 FLOOR WIRE (SHORT) Click here

   OK

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

   
   
   1. 

      *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 (-) auxiliary battery terminal.

   2. Turn the power 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 Power switch on (IG) Below 1 V 1 (LSP-) - Body ground Power switch on (IG) Below 1 V

   4. Turn the power switch off.

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

      CAUTION:

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

      Result
      Proceed to OK NG

   
   

   NG

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

   OK

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

   
   
   1. 

      *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

      Result
      Proceed to OK NG

   
   

   NG

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

   OK

7. CHECK DTC

   
   
   1. 

      *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 (-) auxiliary battery terminal.

   3. Clear the DTCs stored in memory.

      Click here

      
      Body Electrical > SRS Airbag > Clear DTCs

   4. Turn the power switch off.

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

   6. Check for DTCs.

      Click here

      
      Body Electrical > SRS Airbag > Trouble Codes

      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.

      Result
      Result OK NG

   
   

   OK

   USE SIMULATION METHOD TO CHECK Click here

   NG

8. CHECK SEAT POSITION AIRBAG SENSOR

   
   
   1. 

      *1	Seat Position Airbag Sensor
      *2	Airbag Sensor Assembly

      Turn the power switch off.

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

      CAUTION:

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

   3. 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.

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

   5. Clear the DTCs stored in memory.

      Click here

      
      Body Electrical > SRS Airbag > Clear DTCs

   6. Turn the power switch off.

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

   8. Check for DTCs.

      Click here

      
      Body Electrical > SRS Airbag > Trouble Codes

      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.

   9. Turn the power switch off.

   10. Disconnect the cable from the negative (-) auxiliary battery terminal.

       CAUTION:

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

   11. Restore the seat position airbag sensor that was installed for testing to its original location.

       Click here

       Result
       Proceed to OK NG

   
   

   OK

   REPLACE SEAT POSITION AIRBAG SENSOR Click here

   NG

   REPLACE AIRBAG SENSOR ASSEMBLY Click here

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

   
   
   1. 

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

      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 Q13-4 (LSP+) - Body ground Always 1 MΩ or higher Q13-3 (LSP-) - Body ground Always 1 MΩ or higher

      Result
      Proceed to OK NG

   
   

   OK

   REPLACE FRONT SEAT INNER BELT ASSEMBLY LH Click here

   NG

   REPLACE NO. 2 FLOOR WIRE

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

    
    
    1. 

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

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

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

    3. Turn the power switch on (IG).

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

       Standard Voltage
       Tester Connection Condition Specified Condition Q13-4 (LSP+) - Body ground Power switch on (IG) Below 1 V Q13-3 (LSP-) - Body ground Power switch on (IG) Below 1 V

       Result
       Proceed to OK NG

    
    

    OK

    REPLACE FRONT SEAT INNER BELT ASSEMBLY LH Click here

    NG

    REPLACE NO. 2 FLOOR WIRE

11. CHECK NO. 2 FLOOR WIRE (SHORT)

    
    
    1. 

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

       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 Q13-4 (LSP+) - Q13-3 (LSP-) Always 1 MΩ or higher

       Result
       Proceed to OK NG

    
    

    OK

    REPLACE FRONT SEAT INNER BELT ASSEMBLY LH Click here

    NG

    REPLACE NO. 2 FLOOR WIRE

12. CHECK NO. 2 FLOOR WIRE (OPEN)

    
    
    1. 

       *1	Seat Position Airbag Sensor
       *2	Airbag Sensor Assembly
       *3	Front Seat Inner Belt Assembly LH
       *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 LH)

       Disconnect the No. 2 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 Q13-4 (LSP+) - Q13-3 (LSP-) Always Below 1 Ω

    3. Disconnect the service wire from the connector B.

       Result
       Proceed to OK NG

    
    

    OK

    REPLACE FRONT SEAT INNER BELT ASSEMBLY LH Click here

    NG

    REPLACE NO. 2 FLOOR WIRE

13. CHECK CONNECTORS

    
    

    1. Turn the power switch off.

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

       CAUTION:

       Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary 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.

       Result
       Proceed to OK NG

    
    

    NG

    REPLACE WIRE HARNESS

    OK

14. CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT (OPEN)

    
    
    1. 

       *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 floor wire.

    2. Using a service wire, connect terminals 9 (RSP+) and 17 (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

       Result
       Proceed to OK NG

    
    

    NG

    CHECK FLOOR WIRE (OPEN) Click here

    OK

15. CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT (SHORT)

    
    
    1. 

       *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

       Result
       Result OK NG

    
    

    NG

    CHECK FLOOR WIRE (SHORT) Click here

    OK

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

    
    
    1. 

       *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 (-) auxiliary battery terminal.

    2. Turn the power 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 Power switch on (IG) Below 1 V 1 (RSP-) - Body ground Power switch on (IG) Below 1 V

    4. Turn the power switch off.

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

       CAUTION:

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

       Result
       Proceed to OK NG

    
    

    NG

    CHECK FLOOR WIRE (SHORT TO B+) Click here

    OK

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

    
    
    1. 

       *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

       Result
       Proceed to OK NG

    
    

    NG

    CHECK FLOOR WIRE (SHORT TO GROUND) Click here

    OK

18. CHECK DTC

    
    
    1. 

       *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 (-) auxiliary battery terminal.

    3. Clear the DTCs stored in memory.

       Click here

       
       Body Electrical > SRS Airbag > Clear DTCs

    4. Turn the power switch off.

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

    6. Check for DTCs.

       Click here

       
       Body Electrical > SRS Airbag > Trouble Codes

       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.

       Result
       Result OK NG

    
    

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

19. CHECK SEAT POSITION AIRBAG SENSOR

    
    
    1. 

       *1	Seat Position Airbag Sensor
       *2	Airbag Sensor Assembly

       Turn the power switch off.

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

       CAUTION:

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

    3. 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.

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

    5. Clear the DTCs stored in memory.

       Click here

       
       Body Electrical > SRS Airbag > Clear DTCs

    6. Turn the power switch off.

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

    8. Check for DTCs.

       Click here

       
       Body Electrical > SRS Airbag > Trouble Codes

       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.

    9. Turn the power switch off.

    10. Disconnect the cable from the negative (-) auxiliary battery terminal.

        CAUTION:

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

    11. Restore the seat position airbag sensor that was installed for testing to its original location.

        Click here

        Result
        Proceed to OK NG

    
    

    OK

    REPLACE SEAT POSITION AIRBAG SENSOR Click here

    NG

    REPLACE AIRBAG SENSOR ASSEMBLY Click here

20. CHECK FLOOR WIRE (SHORT TO GROUND)

    
    
    1. 

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

       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 P4-4 (RSP+) - Body ground Always 1 MΩ or higher P4-3 (RSP-) - Body ground Always 1 MΩ or higher

       Result
       Proceed to OK NG

    
    

    OK

    REPLACE FRONT SEAT INNER BELT ASSEMBLY RH Click here

    NG

    REPLACE FLOOR WIRE

21. CHECK FLOOR WIRE (SHORT TO B+)

    
    
    1. 

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

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

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

    3. Turn the power switch on (IG).

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

       Standard Voltage
       Tester Connection Condition Specified Condition P4-4 (RSP+) - Body ground Power switch on (IG) Below 1 V P4-3 (RSP-) - Body ground Power switch on (IG) Below 1 V

       Result
       Proceed to OK NG

    
    

    OK

    REPLACE FRONT SEAT INNER BELT ASSEMBLY RH Click here

    NG

    REPLACE FLOOR WIRE

22. CHECK FLOOR WIRE (SHORT)

    
    
    1. 

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

       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 P4-4 (RSP+) - P4-3 (RSP-) Always 1 MΩ or higher

       Result
       Proceed to OK NG

    
    

    OK

    REPLACE FRONT SEAT INNER BELT ASSEMBLY RH Click here

    NG

    REPLACE FLOOR WIRE

23. CHECK FLOOR WIRE (OPEN)

    
    
    1. 

       *1	Seat Position Airbag Sensor
       *2	Airbag Sensor Assembly
       *3	Front Seat Inner Belt Assembly RH
       *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 RH)

       Disconnect the 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 P4-4 (RSP+) - P4-3 (RSP-) Always Below 1 Ω

    3. Disconnect the service wire from the connector B.

       Result
       Proceed to OK NG

    
    

    OK

    REPLACE FRONT SEAT INNER BELT ASSEMBLY RH Click here

    NG

    REPLACE FLOOR WIRE