Occupant Classification System Malfunction - Airbag System

SUPPLEMENTAL RESTRAINT SYSTEM: AIRBAG SYSTEM: B1650/32, B1650/32: Occupant Classification System Malfunction
B1650/32 - Occupant Detection Sensor Circuit Malfunction

DESCRIPTION

w/ Occupant Classification System:

The occupant classification system circuit consists of the center airbag sensor and the occupant classification system.

If the center airbag sensor receives signals from the occupant classification ECU, it determines whether the front passenger airbag, the front seat side airbag RH and front seat outer belt should be operated.

DTC B1650/32 is recorded when a malfunction is detected in the occupant classification system circuit.





w/o Occupant Classification System:

The occupant detection sensor circuit consists of the center airbag sensor and the occupant detection sensor.

If the center airbag sensor receives signals from the occupant detection sensor, it determines whether the front passenger airbag, the front seat side airbag RH and front seat outer belt should be operated.

DTC B1650/32 is recorded when a malfunction is detected in the occupant detection sensor circuit.





WIRING DIAGRAM

w/ Occupant Classification System





w/o Occupant Classification System





INSPECTION PROCEDURE

PROCEDURE

1. CHECK VEHICLE CONDITION

(a) Check whether or not the vehicle is equipped with the Occupant Classification System.

Result:

A
w/ Occupant Classification System

B
w/o Occupant Classification System

B -- CHECK DTC
A -- Continue to next step.

2. CHECK FOR DTC (OCCUPANT CLASSIFICATION ECU)

(a) Turn the engine switch on (IG), and wait for at least 10 seconds.

(b) Using the Techstream, check the DTCs of the occupant classification ECU Occupant Classification System.

OK:

DTC is not output.

NG -- REPAIR CIRCUITS INDICATED BY OUTPUT DTCS
OK -- Continue to next step.

3. CHECK FOR DTC (CENTER AIRBAG SENSOR ASSEMBLY)

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





(b) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

(c) Turn the engine switch off.

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

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

OK:

DTC B1650/32 is not output.

HINT
Codes other than DTC B1650/32 may be output at this time, but they are not related to this check.

NG -- CHECK CONNECTION OF CONNECTORS

OK -- USE SIMULATION METHOD TO CHECK Diagnosis System

4. 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 and the occupant classification ECU.

OK:

The connectors are properly connected.

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

5. CHECK CONNECTORS

(a) Disconnect the connectors from the center airbag sensor and the occupant classification ECU.

(b) Check that the connectors (on the center airbag sensor side and occupant classification ECU side) are not damaged.

OK:

The connectors are not deformed or damaged.

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

6. CHECK OCCUPANT CLASSIFICATION SYSTEM CIRCUIT





(a) Using a service wire, connect terminals 9 (FSR+) and 17 (FSR-) 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 of the wire harness side connector.

Standard resistance:





(c) Disconnect the service wire from connector B.

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

Standard resistance:





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

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

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

Standard voltage:





NG -- CHECK FLOOR WIRE

OK -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY Removal

7. CHECK FLOOR WIRE





(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 front seat wire RH connector from the floor wire.

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

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

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

Standard resistance:





(f) Disconnect the service wire from connector B.

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

Standard resistance:





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

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

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

Standard voltage:





NG -- REPLACE FLOOR WIRE

OK -- REPLACE FRONT SEAT WIRE RH

8. CHECK DTC

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





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

(c) Turn the engine switch off.

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

(e) Check the DTCs Reading and Clearing Diagnostic Trouble Codes.

OK:

DTC B1650/32 is not output.

HINT
Codes other than DTC B1650/32 may be output at this time, but they are not related to this check.

NG -- CHECK CONNECTION OF CONNECTORS

OK -- USE SIMULATION METHOD TO CHECK Diagnosis System

9. 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 occupant detection sensor.

OK:

The connectors are properly connected.

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

10. CHECK CONNECTORS

(a) Disconnect the connectors from the center airbag sensor assembly and the occupant detection sensor.

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

OK:

The connectors are not deformed or damaged.

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

11. CHECK FLOOR WIRE (OPEN)

(a) Disconnect the connectors from the center airbag sensor assembly and the occupant detection sensor.





(b) Using a service wire, connect terminals 9 (FSR+) and 17 (FSR-) 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 -- REPLACE FLOOR WIRE
OK -- Continue to next step.

12. CHECK FLOOR 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 -- REPLACE FLOOR WIRE
OK -- Continue to next step.

13. CHECK FLOOR WIRE (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 -- REPLACE FLOOR WIRE
OK -- Continue to next step.

14. CHECK FLOOR WIRE (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 -- REPLACE FLOOR WIRE
OK -- Continue to next step.

15. CHECK OCCUPANT DETECTION SENSOR

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





NOTICE:
Connect the positive tester lead to terminal FSR+, and the negative tester lead to terminal FSR-.

Standard resistance:





NG -- REPLACE OCCUPANT DETECTION SENSOR
OK -- Continue to next step.

16. CHECK CENTER AIRBAG SENSOR ASSEMBLY

(a) Connect the connectors to the center airbag sensor assembly and the occupant detection 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 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 the DTCs Reading and Clearing Diagnostic Trouble Codes.

OK:

DTC B1650/32 is not output.

HINT
Codes other than DTC B1650/32 may be output at this time, but they are not related to this check.

NG -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY Removal

OK -- USE SIMULATION METHOD TO CHECK Diagnosis System