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 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

NOTICE:
After the engine switch is turned off, the HDD navigation system requires approximately 6 minutes to record various types of memory and settings. As a result, after turning the engine switch off, wait 6 minutes or more before disconnecting the cable from the negative (-) battery terminal.

PROCEDURE

1. CHECK FOR DTC (OCCUPANT CLASSIFICATION ECU)

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

(b) Check for 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 Occupant Classification System
OK -- Continue to next step.

2. CHECK FOR DTC (CENTER AIRBAG SENSOR)





(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

3. 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.

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 22 (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:





(c) Disconnect the service wire from connector B.

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

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 according to the value(s) in the table below.

Standard voltage:





NG -- CHECK FLOOR WIRE

OK -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY Components

6. 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 16 (FSR+) and 22 (FSR-) of connector B.

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

Standard resistance:





(f) Disconnect the service wire from connector B.

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

Standard resistance:





(h) Turn the engine switch off.

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

(j) Disconnect the front seat wire RH connector from the floor wire.

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

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

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

Standard voltage:





NG -- REPLACE FLOOR WIRE

OK -- REPLACE FRONT SEAT WIRE RH