Dtc B1650/32 Occupant Classification System Malfunction

Vehicle Interior. Yaris. Ncp93, 131
Supplemental Restraint Systems. Yaris. Ncp93, 131

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK DTC (OCCUPANT DETECTION ECU)

CHECK CONNECTORS

CHECK OCCUPANT CLASSIFICATION SYSTEM CIRCUIT (OPEN)

CHECK OCCUPANT CLASSIFICATION SYSTEM CIRCUIT (SHORT)

CHECK OCCUPANT CLASSIFICATION SYSTEM CIRCUIT (SHORT TO B+)

CHECK OCCUPANT CLASSIFICATION SYSTEM CIRCUIT (SHORT TO GROUND)

CHECK FLOOR WIRE (OPEN)

CHECK FLOOR WIRE (SHORT)

CHECK FLOOR WIRE (SHORT TO B+)

CHECK FLOOR WIRE (SHORT TO GROUND)

DTC B1650/32 Occupant Classification System Malfunction


DESCRIPTION

The occupant classification system circuit consists of the airbag sensor assembly and occupant classification system.
If the airbag sensor assembly receives signals from the occupant detection ECU, it determines whether the front passenger airbag, front seat side airbag assembly RH and front seat belt pretensioner RH should be operated.
DTC B1650/32 is stored when a malfunction is detected in the occupant classification system circuit.

DTC No.
DTC Detection Condition
Trouble Area
B1650/32
  1. The airbag sensor assembly receives a line short circuit signal, an open circuit signal, a short circuit to ground signal or a short circuit to B+ signal in the occupant classification system circuit.
  2. Occupant classification system malfunction
  3. Airbag sensor assembly malfunction
  1. Floor wire
  2. Front seat wire RH
  3. Occupant classification system
  4. Airbag sensor assembly

WIRING DIAGRAM


Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). Dtc B1650/32 Occupant Classification System Malfunction


INSPECTION PROCEDURE

1.CHECK DTC (OCCUPANT DETECTION ECU)

  1. Turn the ignition switch to ON.

  1. Check for DTCs of the occupant detection ECU (YARIS_NCP93 RM0000010VK072X.html).

    OK:
    DTC is not output.


NG
REPAIR CIRCUITS INDICATED BY OUTPUT DTCS (YARIS_NCP93 RM000001NEQ018X.html)
OK


2.CHECK CONNECTORS

  1. Turn the ignition switch off.

  1. Disconnect the cable from the negative (-) battery terminal.

    CAUTION:
    Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

  1. Check that the connectors are properly connected to the airbag sensor assembly and occupant detection ECU. Also check that the connectors that link the floor wire and front seat wire RH are properly connected.

    OK:
    The connectors are properly connected.
    HINT:
    If the connectors are not connected securely, reconnect the connectors and proceed to the next inspection.

  1. Disconnect the connectors from the airbag sensor assembly and occupant detection ECU. Also disconnect the connectors that link the floor wire and front seat wire RH.

  1. Check that the terminals of the connectors are not damaged.

    OK:
    The terminals are not deformed or damaged.


NG
REPLACE WIRE HARNESS
OK


3.CHECK OCCUPANT CLASSIFICATION SYSTEM CIRCUIT (OPEN)


  1. Connect the connectors that link the floor wire and front seat wire RH.


    Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). Dtc B1650/32 Occupant Classification System Malfunction


Text in Illustration
*1
Occupant Detection ECU
*2
Airbag Sensor Assembly
*3
Connector B
*4
Connector E
*5
Service Wire
-
-
*a
Front view of wire harness connector
(to Airbag Sensor Assembly)
*b
Front view of wire harness connector
(to Occupant Detection ECU)

  1. Using the service wire, connect terminals 16 (FSR+) and 24 (FSR-) of connector B.

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

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    X4-7 (FSR+) - X4-4 (FSR-)
    		Always
    		Below 1 Ω


NG
Go to step 7
OK


4.CHECK OCCUPANT CLASSIFICATION SYSTEM CIRCUIT (SHORT)


    Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). Dtc B1650/32 Occupant Classification System Malfunction

  1. Disconnect the service wire from connector B.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    X4-7 (FSR+) - X4-4 (FSR-)
    		Always
    		1 MΩ or higher
    Text in Illustration
    *1
    		Occupant Detection ECU
    *2
    		Airbag Sensor Assembly
    *3
    		Connector E
    *a
    		Front view of wire harness connector
    (to Occupant Detection ECU)


NG
Go to step 8
OK


5.CHECK OCCUPANT CLASSIFICATION SYSTEM CIRCUIT (SHORT TO B+)


    Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). Dtc B1650/32 Occupant Classification System Malfunction

  1. Connect the cable to the negative (-) battery terminal.

  1. Turn the ignition switch to ON.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    X4-7 (FSR+) - Body ground
    		Ignition switch ON
    		Below 1 V
    X4-4 (FSR-) - Body ground
    		Ignition switch ON
    		Below 1 V
    Text in Illustration
    *1
    		Occupant Detection ECU
    *2
    		Airbag Sensor Assembly
    *3
    		Connector E
    *a
    		Front view of wire harness connector
    (to Occupant Detection ECU)


NG
Go to step 9
OK


6.CHECK OCCUPANT CLASSIFICATION SYSTEM CIRCUIT (SHORT TO GROUND)


    Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). Dtc B1650/32 Occupant Classification System Malfunction

  1. Turn the ignition switch off.

  1. Disconnect the cable from the negative (-) battery terminal.

    CAUTION:
    Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    X4-7 (FSR+) - Body ground
    		Always
    		1 MΩ or higher
    X4-4 (FSR-) - Body ground
    		Always
    		1 MΩ or higher
    Text in Illustration
    *1
    		Occupant Detection ECU
    *2
    		Airbag Sensor Assembly
    *3
    		Connector E
    *a
    		Front view of wire harness connector
    (to Occupant Detection ECU)


NG
Go to step 10
OK

REPLACE AIRBAG SENSOR ASSEMBLY (YARIS_NCP93 RM000000V6U02AX.html)

7.CHECK FLOOR WIRE (OPEN)


  1. Disconnect the front seat wire RH from the floor wire.


    Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). Dtc B1650/32 Occupant Classification System Malfunction


    Text in Illustration
    *1
    		Occupant Detection ECU
    		*2
    		Airbag Sensor Assembly
    *3
    		Front Seat Wire RH
    		*4
    		Floor Wire
    *5
    		Connector B
    		*6
    		Connector C
    *7
    		Service Wire
    		-
    		-
    *a
    		Front view of wire harness connector
    (to Airbag Sensor Assembly)
    		*b
    		Front view of wire harness connector
    (to Front Seat Wire RH)
    HINT:
    The service wire has already been inserted into connector B.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    JX1-1 (FSR+) - JX1-5 (FSR-)
    		Always
    		Below 1 Ω

  1. Disconnect the service wire from the connector B.



NG
REPLACE FLOOR WIRE
OK

REPLACE FRONT SEAT WIRE RH

8.CHECK FLOOR WIRE (SHORT)


    Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). Dtc B1650/32 Occupant Classification System Malfunction

  1. Disconnect the front seat wire RH from the floor wire.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    JX1-1 (FSR+) - JX1-5 (FSR-)
    		Always
    		1 MΩ or higher
    Text in Illustration
    *1
    		Occupant Detection ECU
    *2
    		Airbag Sensor Assembly
    *3
    		Front Seat Wire RH
    *4
    		Floor Wire
    *5
    		Connector C
    *a
    		Front view of wire harness connector
    (to Front Seat Wire RH)


NG
REPLACE FLOOR WIRE
OK

REPLACE FRONT SEAT WIRE RH

9.CHECK FLOOR WIRE (SHORT TO B+)


    Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). Dtc B1650/32 Occupant Classification System Malfunction

  1. Turn the ignition switch off.

  1. Disconnect the cable from the negative (-) battery terminal.

    CAUTION:
    Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

  1. Disconnect the front seat wire RH from the floor wire.

  1. Connect the cable to the negative (-) battery terminal.

  1. Turn the ignition switch to ON.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    JX1-1 (FSR+) - Body ground
    		Ignition switch ON
    		Below 1 V
    JX1-5 (FSR-) - Body ground
    		Ignition switch ON
    		Below 1 V
    Text in Illustration
    *1
    		Occupant Detection ECU
    *2
    		Airbag Sensor Assembly
    *3
    		Front Seat Wire RH
    *4
    		Floor Wire
    *5
    		Connector C
    *a
    		Front view of wire harness connector
    (to Front Seat Wire RH)


NG
REPLACE FLOOR WIRE
OK

REPLACE FRONT SEAT WIRE RH

10.CHECK FLOOR WIRE (SHORT TO GROUND)


    Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). Dtc B1650/32 Occupant Classification System Malfunction

  1. Disconnect the front seat wire RH from the floor wire.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    JX1-1 (FSR+) - Body ground
    		Always
    		1 MΩ or higher
    JX1-5 (FSR-) - Body ground
    		Always
    		1 MΩ or higher
    Text in Illustration
    *1
    		Occupant Detection ECU
    *2
    		Airbag Sensor Assembly
    *3
    		Front Seat Wire RH
    *4
    		Floor Wire
    *5
    		Connector C
    *a
    		Front view of wire harness connector
    (to Front Seat Wire RH)


NG
REPLACE FLOOR WIRE
OK

REPLACE FRONT SEAT WIRE RH