Occupant Classification System Malfunction

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

DTC B1650/32 - Occupant Classification System Malfunction

DESCRIPTION

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.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK FOR DTC (OCCUPANT CLASSIFICATION ECU)
(a) Turn the ignition switch ON, and wait for at least 10 seconds.
(b) Using the Techstream, check the 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 FOR DTC (CENTER AIRBAG SENSOR)




(a) Turn the ignition switch ON, and wait for at least 60 seconds.
(b) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
(c) Turn the ignition switch OFF.
(d) Turn the ignition switch ON, 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.

OK -- USE SIMULATION METHOD TO CHECK
NG -- Continue to next step.
3. CHECK CONNECTION OF CONNECTORS
(a) Turn the ignition 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.
4. 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.
5. CHECK OCCUPANT CLASSIFICATION SYSTEM CIRCUIT




(a) Using a service wire, connect terminals 16 (FSR+) and 24 (FSR-) of connector B.
NOTE:
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 ignition switch ON.
(g) Measure the voltage of the wire harness side connector.
Standard voltage:






OK -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY
NG -- Continue to next step.
6. CHECK FLOOR WIRE




(a) Turn the ignition 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.
HINT: The service wire has already been inserted into connector B.
(d) Measure the resistance of the wire harness side connector.
Standard resistance:





(e) Disconnect the front seat wire RH connector from the floor wire.
(f) Measure the resistance of the wire harness side connector.
Standard resistance:





(g) Turn the ignition switch OFF.
(h) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(i) Disconnect the front seat wire RH connector from the floor wire.
(j) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
(k) Turn the ignition switch ON.
(l) Measure the voltage of the wire harness side connector.
Standard voltage:






NG -- REPLACE FLOOR WIRE
OK -- REPLACE FRONT SEAT WIRE RH