Seat Position Airbag Sensor Circuit Malfunction - Airbag System

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 and the seat position airbag sensor.

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





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK DTC

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





(b) Clear the DTCs stored in memory DTC Check / Clear.

(c) Turn the power switch OFF.

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

(e) Check the DTCs DTC Check / Clear.

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.

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

2. CHECK CONNECTION OF CONNECTOR

(a) Turn the power 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 and the seat position airbag sensor.

OK:

The connectors are connected.

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

3. CHECK FLOOR NO. 2 WIRE (OPEN)

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





(b) Using a service wire, connect terminals V16-16 (LSP+) and V16-24 (LSP-) of connector "B".

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

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

Standard resistance:





NG -- REPAIR OR REPLACE FLOOR NO. 2 WIRE
OK -- Continue to next step.

4. CHECK FLOOR NO. 2 WIRE (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 -- REPAIR OR REPLACE FLOOR NO. 2 WIRE
OK -- Continue to next step.

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

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





(b) Turn the power switch ON (IG).

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

Standard voltage:





NG -- REPAIR OR REPLACE FLOOR NO. 2 WIRE
OK -- Continue to next step.

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

(a) Turn the power 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 -- REPAIR OR REPLACE FLOOR NO. 2 WIRE
OK -- Continue to next step.

7. CHECK SEAT POSITION AIRBAG SENSOR

(a) Connect the connectors to the center airbag sensor 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 power switch ON (IG), and wait for at least 60 seconds.

(d) Clear the DTCs stored in memory DTC Check / Clear.

(e) Turn the power switch OFF.

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

(g) Check the DTCs DTC Check / Clear.

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.

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

8. REPLACE SEAT POSITION AIRBAG SENSOR

(a) Turn the power switch OFF.

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

(c) Temporarily replace the seat position airbag sensor with a new or normal functioning one Removal.

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

(c) Clear the DTCs stored in memory DTC Check / Clear.

(d) Turn the power switch OFF.

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

(f) Check the DTCs DTC Check / Clear.

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

OK -- END