B1653

SUPPLEMENTAL RESTRAINT SYSTEM: AIRBAG SYSTEM: B1653/35: Seat Position Airbag Sensor Circuit Malfunction
B1653/35 - Seat Position Airbag Sensor Circuit Malfunction

DESCRIPTION

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

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





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK FOR DTC





(a) Turn the ignition switch to ON, and wait for at least 60 seconds.

(b) Clear the DTCs DTC Check / Clear.

(c) Turn the ignition switch off.

(d) Turn the ignition switch to ON, and wait for at least 60 seconds.

(e) Check the DTCs DTC Check / Clear.

OK:

DTC B1653/35 is not output.

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

OK -- USE SIMULATION METHOD TO CHECK
NG -- Continue to next step.

2. CHECK CONNECTION OF CONNECTOR

(a) Turn the ignition switch off.

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

(c) Check that the connectors are properly connected to the center airbag sensor and the seat position sensor.

OK:

The connectors are properly connected.

NG -- CONNECT CONNECTOR
OK -- Continue to next step.

3. CHECK SEAT POSITION SENSOR CIRCUIT (OPEN)





(a) Disconnect the connectors from the center airbag sensor and the seat position sensor.

(b) Using a service wire, connect 2 and 1 of connector E.

NOTICE:
Do not forcibly insert the service wire into the terminals of the connector when connecting.

(c) Measure the resistance of the wire harness side connector.

(1) w/ Side Airbag:

Standard resistance:





(2) w/o Side Airbag:

Standard resistance:





NG -- CHECK FLOOR WIRE (OPEN)
OK -- Continue to next step.

4. CHECK SEAT POSITION SENSOR CIRCUIT (SHORT)





(a) Disconnect the service wire from connector E.

(b) Measure the resistance of the wire harness side connector.

(1) w/ Side Airbag:

Standard resistance:





(2) w/o Side Airbag:

Standard resistance:





NG -- CHECK FLOOR WIRE (SHORT)
OK -- Continue to next step.

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





(a) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

(b) Turn the ignition switch to ON.

(c) Measure the voltage of the wire harness side connector.

(1) w/ Side Airbag:

Standard voltage:





(2) w/o Side Airbag:

Standard voltage:





NG -- CHECK FLOOR WIRE (TO B+)
OK -- Continue to next step.

6. CHECK SEAT POSITION SENSOR CIRCUIT (TO GROUND)





(a) Turn the ignition switch off.

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

(c) Measure the voltage of the wire harness side connector.

(1) w/ Side Airbag:

Standard resistance:





(2) w/o Side Airbag:

Standard resistance:





NG -- CHECK FLOOR WIRE (TO GROUND)
OK -- Continue to next step.

7. CHECK SEAT POSITION SENSOR





(a) Connect the connectors to the center airbag sensor and the seat position sensor.

(b) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

(c) Turn the ignition switch to ON, and wait for at least 60 seconds.

(d) Clear the DTCs DTC Check / Clear.

(e) Turn the ignition switch off.

(f) Turn the ignition switch to ON, and wait for at least 60 seconds.

(g) Check the DTCs DTC Check / Clear.

OK:

DTC B1653/35 is not output.

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

OK -- USE SIMULATION METHOD TO CHECK
NG -- Continue to next step.

8. REPLACE SEAT POSITION SENSOR

(a) Turn the ignition switch off.

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

(c) Replace the seat position sensor Components.

HINT
Perform the inspection using parts from a normal vehicle if possible.

NEXT -- Continue to next step.

9. CHECK CENTER AIRBAG SENSOR ASSEMBLY





(a) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

(b) Turn the ignition switch to ON, and wait for at least 60 seconds.

(c) Clear the DTCs DTC Check / Clear.

(d) Turn the ignition switch off.

(e) Turn the ignition switch to ON, and wait for at least 60 seconds.

(f) Check the DTCs DTC Check / Clear.

OK:

DTC B1653/35 is not output.

HINT
DTCs 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

OK -- END

10. CHECK FLOOR WIRE (OPEN)





(a) Disconnect the front seat inner belt LH connector from the flow wire.

HINT
The service wire has already been inserted into connector E.

(b) Measure the resistance of the wire harness side connectors.

Standard resistance:





NG -- REPAIR OR REPLACE FLOOR WIRE

OK -- REPLACE FRONT SEAT INNER BELT ASSEMBLY LH

11. CHECK FLOOR WIRE (SHORT)





(a) Disconnect the front seat inner belt LH connector from the floor wire.

(b) Measure the resistance of the wire harness side connector.

Standard resistance:





NG -- REPAIR OR REPLACE FLOOR WIRE

OK -- REPLACE FRONT SEAT INNER BELT ASSEMBLY LH

12. CHECK FLOOR WIRE (TO B+)





(a) Turn the ignition switch off.

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

(c) Disconnect the front seat inner belt LH connector from the floor wire.

(d) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

(e) Turn the ignition switch to ON.

(f) Measure the voltage of the wire harness side connectors.

Standard voltage:





NG -- REPAIR OR REPLACE FLOOR WIRE

OK -- REPLACE FRONT SEAT INNER BELT ASSEMBLY LH

13. CHECK FLOOR WIRE (TO GROUND)





(a) Disconnect the front seat inner belt LH connector from the floor wire.

(b) Measure the resistance of the wire harness side connectors.

Standard resistance:





NG -- REPAIR OR REPLACE FLOOR WIRE

OK -- REPLACE FRONT SEAT INNER BELT ASSEMBLY LH