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 airbag sensor circuit consists of the center airbag sensor assembly and the 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 CONNECTION OF CONNECTORS

(a) Turn the engine switch off.

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

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

OK:

The connectors are properly connected.

NG -- CONNECT CONNECTORS PROPERLY
OK -- Continue to next step.

2. CHECK CONNECTORS

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

(b) Check that the connectors (on the center airbag sensor assembly side and seat position airbag sensor side) are not damaged.

OK:

The connectors are not deformed or damaged.

NG -- REPLACE WIRE HARNESS
OK -- Continue to next step.

3. CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT (OPEN)

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





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

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

Standard resistance:





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

4. CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT (SHORT)





(a) Disconnect the service wire from connector B.

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

Standard resistance:





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

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

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





(b) Turn the engine switch on (IG).

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

Standard voltage:





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

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

(a) Turn the engine switch off.





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

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

Standard resistance:





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

7. CHECK SEAT POSITION AIRBAG SENSOR

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





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

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

(d) Clear the DTCs stored in the memory Reading and Clearing Diagnostic Trouble Codes.

(e) Turn the engine switch off.

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

(g) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.

OK:

DTC B1653/35 is not output.

HINT
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

OK -- USE SIMULATION METHOD TO CHECK Diagnosis System

8. REPLACE SEAT POSITION AIRBAG SENSOR

(a) Turn the engine switch off.

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

(c) Replace the seat position airbag sensor Removal.

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

NEXT -- Continue to next step.

9. CHECK CENTER AIRBAG SENSOR ASSEMBLY

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





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

(c) Clear the DTCs stored in the memory Reading and Clearing Diagnostic Trouble Codes.

(d) Turn the engine switch off.

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

(f) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.

OK:

DTC B1653/35 is not output.

HINT
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 Removal

OK -- END

10. CHECK FLOOR WIRE (OPEN)

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





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

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

Standard resistance:





NG -- REPLACE FLOOR WIRE

OK -- REPLACE FRONT SEAT INNER BELT ASSEMBLY LH Removal

11. CHECK FLOOR WIRE (SHORT)

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





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

Standard resistance:





NG -- REPLACE FLOOR WIRE

OK -- REPLACE FRONT SEAT INNER BELT ASSEMBLY LH Removal

12. CHECK FLOOR WIRE (SHORT TO B+)

(a) Turn the engine switch off.





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

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

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

(e) Turn the engine switch on (IG).

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

Standard voltage:





NG -- REPLACE FLOOR WIRE

OK -- REPLACE FRONT SEAT INNER BELT ASSEMBLY LH Removal

13. CHECK FLOOR WIRE (SHORT TO GROUND)

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





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

Standard resistance:





NG -- REPLACE FLOOR WIRE

OK -- REPLACE FRONT SEAT INNER BELT ASSEMBLY LH Removal