AIRBAG SYSTEM, Diagnostic DTC:B1653/35

DESCRIPTION

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

DTC B1653/35 is recorded 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. Check vehicle condition.

      Result
      Result Proceed to for LHD A for RHD B

   
   

   B

   CHECK CONNECTORS Click here

   A

2. CHECK CONNECTORS

   
   

   1. Turn the power switch off.

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

      Note

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

      

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

      Note

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

      SST

      09843-18040

   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

      Text in Illustration

      *1	Seat Position Airbag Sensor	*2	Center Airbag Sensor Assembly
      *3	Front view of wire harness connector (to Center Airbag Sensor Assembly)	*4	Front view of wire harness connector (to Seat Position Airbag Sensor)
      *5	Connector B	*6	Connector E

   
   

   NG

   CHECK NO. 2 FLOOR WIRE (OPEN) Click here

   OK

4. CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT (SHORT)

   
   
   1. 

      Text in Illustration

      *1	Seat Position Airbag Sensor
      *2	Center Airbag Sensor Assembly
      *3	Front view of wire harness connector (to Seat Position Airbag Sensor)
      *4	Connector E

      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

   
   

   NG

   CHECK NO. 2 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	Center Airbag Sensor Assembly
      *3	Front view of wire harness connector (to Seat Position Airbag Sensor)
      *4	Connector E

      Connect the cable to the negative (-) 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 Switch 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

   
   

   NG

   CHECK NO. 2 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	Center Airbag Sensor Assembly
      *3	Front view of wire harness connector (to Seat Position Airbag Sensor)
      *4	Connector E

      Turn the power switch off.

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

      Note

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

   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

   
   

   NG

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

   OK

7. CHECK SEAT POSITION AIRBAG SENSOR

   
   
   1. 

      Text in Illustration

      *1	Seat Position Airbag Sensor
      *2	Center Airbag Sensor Assembly

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

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

   5. Turn the power switch off.

   6. Turn the power 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

8. REPLACE SEAT POSITION AIRBAG SENSOR

   
   

   1. Turn the power switch off.

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

      Note

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

   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

9. CHECK CENTER AIRBAG SENSOR ASSEMBLY

   
   
   1. 

      Text in Illustration

      *1	Seat Position Airbag Sensor
      *2	Center Airbag Sensor Assembly

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

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

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

   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.

      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

10. CHECK NO. 2 FLOOR WIRE (OPEN)

    
    

    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 P7-2 (LSP+) - P7-4 (LSP-) Always Below 1 Ω

       Text in Illustration

       *1	Seat Position Airbag Sensor	*2	Center Airbag Sensor Assembly
       *3	Front Seat Inner Belt Assembly LH	*4	No. 2 Floor Wire
       *5	Front view of wire harness connector (to Center Airbag Sensor Assembly)	*6	Front view of wire harness connector (to Front Seat Inner Belt Assembly LH)
       *7	Connector B	*8	Connector C

    
    

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

    REPLACE FRONT SEAT INNER BELT ASSEMBLY LH Click here

11. CHECK NO. 2 FLOOR WIRE (SHORT)

    
    
    1. 

       Text in Illustration

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

       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 P7-2 (LSP+) - P7-4 (LSP-) Always 1 MΩ or higher

    
    

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

    REPLACE FRONT SEAT INNER BELT ASSEMBLY LH Click here

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

    
    
    1. 

       Text in Illustration

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

       Turn the power switch off.

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

       Note

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

    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 power switch on (IG).

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

       Standard Voltage
       Tester Connection Switch Condition Specified Condition P7-2 (LSP+) - Body ground Power switch on (IG) Below 1 V P7-4 (LSP-) - Body ground Power switch on (IG) Below 1 V

    
    

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

    REPLACE FRONT SEAT INNER BELT ASSEMBLY LH Click here

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

    
    
    1. 

       Text in Illustration

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

       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 P7-2 (LSP+) - Body ground Always 1 MΩ or higher P7-4 (LSP-) - Body ground Always 1 MΩ or higher

    
    

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

    REPLACE FRONT SEAT INNER BELT ASSEMBLY LH Click here

14. CHECK CONNECTORS

    
    

    1. Turn the power switch off.

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

       Note

       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 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 connectors are not damaged.

       OK
       The terminals are not deformed or damaged.

    
    

    NG

    REPLACE WIRE HARNESS

    OK

15. CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT (OPEN)

    
    

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

       

    2. Using SST, connect terminals 16 (RSP+) and 24 (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

       Text in Illustration

       *1	Seat Position Airbag Sensor	*2	Center Airbag Sensor Assembly
       *3	Front view of wire harness connector (to Center Airbag Sensor Assembly)	*4	Front view of wire harness connector (to Seat Position Airbag Sensor)
       *5	Connector B	*6	Connector E

    
    

    NG

    CHECK FLOOR WIRE (OPEN) Click here

    OK

16. CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT (SHORT)

    
    
    1. 

       Text in Illustration

       *1	Seat Position Airbag Sensor
       *2	Center Airbag Sensor Assembly
       *3	Front view of wire harness connector (to Seat Position Airbag Sensor)
       *4	Connector E

       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 FLOOR WIRE (SHORT) Click here

    OK

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

    
    
    1. 

       Text in Illustration

       *1	Seat Position Airbag Sensor
       *2	Center Airbag Sensor Assembly
       *3	Front view of wire harness connector (to Seat Position Airbag Sensor)
       *4	Connector E

       Connect the cable to the negative (-) 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 Switch 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

    
    

    NG

    CHECK FLOOR WIRE (SHORT TO B+) Click here

    OK

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

    
    
    1. 

       Text in Illustration

       *1	Seat Position Airbag Sensor
       *2	Center Airbag Sensor Assembly
       *3	Front view of wire harness connector (to Seat Position Airbag Sensor)
       *4	Connector E

       Turn the power switch off.

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

       Note

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

    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 FLOOR WIRE (SHORT TO GROUND) Click here

    OK

19. CHECK SEAT POSITION AIRBAG SENSOR

    
    
    1. 

       Text in Illustration

       *1	Seat Position Airbag Sensor
       *2	Center Airbag Sensor Assembly

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

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

    5. Turn the power switch off.

    6. Turn the power 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

20. REPLACE SEAT POSITION AIRBAG SENSOR

    
    

    1. Turn the power switch off.

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

       Note

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

    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

21. CHECK CENTER AIRBAG SENSOR ASSEMBLY

    
    
    1. 

       Text in Illustration

       *1	Seat Position Airbag Sensor
       *2	Center Airbag Sensor Assembly

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

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

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

    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.

       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

22. CHECK FLOOR WIRE (OPEN)

    
    

    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 O35-2 (RSP+) - O35-4 (RSP-) Always Below 1 Ω

       Text in Illustration

       *1	Seat Position Airbag Sensor	*2	Center Airbag Sensor Assembly
       *3	Front Seat Inner Belt Assembly RH	*4	Floor Wire
       *5	Front view of wire harness connector (to Center Airbag Sensor Assembly)	*6	Front view of wire harness connector (to Front Seat Inner Belt Assembly RH)
       *7	Connector B	*8	Connector C

    
    

    NG

    REPLACE FLOOR WIRE

    OK

    REPLACE FRONT SEAT INNER BELT ASSEMBLY RH Click here

23. CHECK FLOOR WIRE (SHORT)

    
    
    1. 

       Text in Illustration

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

       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 O35-2 (RSP+) - O35-4 (RSP-) Always 1 MΩ or higher

    
    

    NG

    REPLACE FLOOR WIRE

    OK

    REPLACE FRONT SEAT INNER BELT ASSEMBLY RH Click here

24. CHECK FLOOR WIRE (SHORT TO B+)

    
    
    1. 

       Text in Illustration

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

       Turn the power switch off.

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

       Note

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

    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 power switch on (IG).

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

       Standard Voltage
       Tester Connection Switch Condition Specified Condition O35-2 (RSP+) - Body ground Power switch on (IG) Below 1 V O35-4 (RSP-) - Body ground Power switch on (IG) Below 1 V

    
    

    NG

    REPLACE FLOOR WIRE

    OK

    REPLACE FRONT SEAT INNER BELT ASSEMBLY RH Click here

25. CHECK FLOOR WIRE (SHORT TO GROUND)

    
    
    1. 

       Text in Illustration

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

       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 O35-2 (RSP+) - Body ground Always 1 MΩ or higher O35-4 (RSP-) - Body ground Always 1 MΩ or higher

    
    

    NG

    REPLACE FLOOR WIRE

    OK

    REPLACE FRONT SEAT INNER BELT ASSEMBLY RH Click here