B1650

SUPPLEMENTAL RESTRAINT SYSTEMS: 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 stored 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 engine switch on (IG), 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
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. DTC Check / Clear
(c) Turn the engine switch off.
(d) Turn the engine switch on (IG), and wait for at least 60 seconds.
(e) Check for DTCs. DTC Check / Clear
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
3. CHECK CONNECTION OF CONNECTORS
(a) Turn the engine 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 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 ECU CIRCUIT





(a) Using a service wire, connect terminals 16 (FSR+) and 22 (FSR-) of connector B.
NOTE: Do not forcibly insert the service wire into the terminals of the connector when connecting a service 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 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
6. CHECK NO. 2 FLOOR WIRE (CENTER AIRBAG SENSOR - FRONT SEAT WIRE RH)





(a) Turn the engine switch off.
(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 16 (FSR+) and 22 (FSR-) of connector B.
NOTE: 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