B1650

SUPPLEMENTAL RESTRAINT SYSTEMS: 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 occupant classification ECU.

If the center airbag sensor receives signals from the occupant classification ECU, it determines whether the instrument panel passenger airbag, lower No. 2 instrument panel airbag, front seat airbag RH and front seat outer belt should be operated.

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





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
When disconnecting the cable from the negative (-) battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected Repair Instruction - Initialization.

PROCEDURE

1. CHECK FOR DTC (OCCUPANT CLASSIFICATION ECU)

(a) Turn the ignition switch to ON, and wait for at least 10 seconds.

(b) 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 How To Proceed With Troubleshooting
OK -- Continue to next step.

2. CHECK FOR DTC (CENTER AIRBAG SENSOR)

(a) Turn the ignition switch to 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 to ON, and wait for at least 60 seconds.

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

OK:

DTC B1650 is not output.

HINT
Codes other than DTC B1650 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 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 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 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.





Text in Illustration





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

5. CHECK OCCUPANT CLASSIFICATION ECU CIRCUIT

(a) Using a service wire, connect terminals 12 (FSR+) and 13 (FSR-) of connector B.

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





Text in Illustration





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

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

Standard Voltage:





NG -- CHECK NO. 2 FLOOR WIRE (CENTER AIRBAG SENSOR - FRONT SEAT WIRE RH)

OK -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY Removal

6. CHECK NO. 2 FLOOR WIRE (CENTER AIRBAG SENSOR - FRONT SEAT WIRE RH)

(a) Turn the ignition switch off.





Text in Illustration





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

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

(d) Using a service wire, connect terminals 12 (FSR+) and 13 (FSR-) of connector B.

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

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

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

Standard Voltage:





NG -- REPLACE NO. 2 FLOOR WIRE

OK -- REPLACE FRONT SEAT WIRE RH Disassembly