Occupant Classification System Malfunction - Airbag System

SUPPLEMENTAL RESTRAINT SYSTEM: AIRBAG SYSTEM: B1650/32: Occupant Classification System Malfunction
B1650/32 - Occupant Classification System Malfunction

DESCRIPTION

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

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

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





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK DTC (OCCUPANT CLASSIFICATION ECU)

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

(b) Using the Techstream, check for DTCs of the occupant classification ECU Reading and Clearing Diagnostic Trouble Codes.

OK:

DTC is not output.

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

2. 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 classification ECU.

OK:

The connectors are properly connected.

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

3. CHECK CONNECTORS

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

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

OK:

The connectors are not deformed or damaged.

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

4. CHECK OCCUPANT CLASSIFICATION SYSTEM CIRCUIT (OPEN)

(a) Using a service wire, connect terminals 16 (FSR+) and 24 (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 according to the value(s) in the table below.

Standard resistance:





NG -- CHECK FLOOR WIRE NO. 2 (OPEN)
OK -- Continue to next step.

5. CHECK OCCUPANT CLASSIFICATION SYSTEM 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 NO. 2 (SHORT)
OK -- Continue to next step.

6. CHECK OCCUPANT CLASSIFICATION SYSTEM 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 NO. 2 (SHORT TO B+)
OK -- Continue to next step.

7. CHECK OCCUPANT CLASSIFICATION SYSTEM 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:





HINT
After replacing the center airbag sensor assembly, check for DTCs of the center airbag sensor assembly. If the DTC B1650/32 is detected, replace the occupant classification ECU Removal and perform "zero point calibration" and "sensitivity check" of the occupant classification system Initialization.

NG -- CHECK FLOOR WIRE NO. 2 (SHORT TO GROUND)

OK -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY Removal

8. CHECK FLOOR WIRE NO. 2 (OPEN)

(a) Disconnect the front seat wire RH connector from the floor wire No. 2.





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 NO. 2

OK -- REPLACE FRONT SEAT WIRE RH

9. CHECK FLOOR WIRE NO. 2 (SHORT)

(a) Disconnect the front seat wire RH connector from the floor wire No. 2.





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

Standard resistance:





NG -- REPLACE FLOOR WIRE NO. 2

OK -- REPLACE FRONT SEAT WIRE RH

10. CHECK FLOOR WIRE NO. 2 (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 front seat wire RH connector from the floor wire No. 2.

(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 NO. 2

OK -- REPLACE FRONT SEAT WIRE RH

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

(a) Disconnect the front seat wire RH connector from the floor wire No. 2.





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

Standard resistance:





NG -- REPLACE FLOOR WIRE NO. 2

OK -- REPLACE FRONT SEAT WIRE RH