Seat Position Airbag Sensor Circuit Malfunction - Airbag System

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

DTC 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 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 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 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 and the seat position airbag sensor.
(b) Check that the connectors (on the center airbag sensor side and seat position airbag sensor side) are not damaged Electronic Circuit Inspection Procedure.
OK:
The connectors are not deformed or damaged.

NG -- REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.

3. CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT (CENTER AIRBAG SENSOR - SEAT POSITION AIRBAG SENSOR)
(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 according to the value(s) in the table below.

Standard Voltage:





(d) Turn the ignition switch off.
(e) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
(f) Using a service wire, connect terminals 13 (DSP-) and 14 (DSP+) of connector B.

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

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

Standard Resistance:





(h) Disconnect the service wire from connector B.
(i) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





NG -- CHECK FLOOR WIRE (CENTER AIRBAG SENSOR - FRONT SEAT INNER BELT LH)
OK -- Continue to next step.

4. CHECK SEAT POSITION AIRBAG SENSOR





(a) Connect the connectors to the center airbag sensor and the seat position airbag 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 stored 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 for 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 SEAT POSITION AIRBAG SENSOR
OK -- USE SIMULATION METHOD TO CHECK
5. REPLACE SEAT POSITION AIRBAG 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 airbag sensor Removal.

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

NEXT -- Continue to next step.

6. CHECK CENTER AIRBAG SENSOR




(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 for 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
7. CHECK FLOOR WIRE (CENTER AIRBAG SENSOR - FRONT SEAT INNER BELT LH)
(a) Disconnect the floor wire connector from the front seat inner belt LH.




(b) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
(c) Turn the ignition switch to ON.
(d) Measure the voltage according to the value(s) in the table below.

Standard Voltage:





(e) Turn the ignition switch off.
(f) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
(g) Using a service wire, connect terminals 13 (DSP-) and 14 (DSP+) of connector B.

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

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

Standard Resistance:





(i) Disconnect the service wire from connector B.
(j) 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