Dtc B1650/32 Occupant Classification System Malfunction

Vehicle Interior. Corolla. Zre142 Aze141
Supplemental Restraint Systems. Corolla. Zre142 Aze141

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK FOR DTC (OCCUPANT CLASSIFICATION 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 NO. 2 FLOOR WIRE (OPEN)

CHECK NO. 2 FLOOR WIRE (SHORT)

CHECK NO. 2 FLOOR WIRE (SHORT TO B+)

CHECK NO. 2 FLOOR WIRE (SHORT TO GROUND)

DTC B1650/32 Occupant Classification System Malfunction


DESCRIPTION

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

DTC No.
DTC Detection Condition
Trouble Area
B1650/32
  1. The center airbag sensor assembly receives a 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 for 2 seconds.
  2. Occupant classification ECU malfunction
  3. Center airbag sensor assembly malfunction
  1. No. 2 floor wire
  2. Front seat wire RH
  3. Occupant classification system
  4. Center airbag sensor assembly

WIRING DIAGRAM


Corolla. Zre142 Aze141.Supplemental Restraint Systems.Airbag System. Dtc B1650/32 Occupant Classification System Malfunction


INSPECTION PROCEDURE

1.CHECK FOR DTC (OCCUPANT CLASSIFICATION ECU)

  1. Turn the ignition switch to ON.

  1. Using the Techstream, check for occupant classification ECU DTCs (COROLLA_ZRE142 RM0000010VK07TX.html).



NG
REPAIR CIRCUITS INDICATED BY OUTPUT DTCS (COROLLA_ZRE142 RM000001OQL02UX.html)
OK


2.CHECK CONNECTORS

  1. Turn the ignition switch off.

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

  1. Check that the connectors are properly connected to the center airbag sensor assembly and the occupant classification ECU. Also check that the connectors that link the front seat wire RH and No. 2 floor wire 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 center airbag sensor assembly and the occupant classification ECU. Also disconnect the connectors that link the front seat wire RH and No. 2 floor wire.

  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)


    Corolla. Zre142 Aze141.Supplemental Restraint Systems.Airbag System. Dtc B1650/32 Occupant Classification System Malfunction

  1. Connect the connectors that link the front seat wire RH and No. 2 floor wire.

  1. Using SST, connect terminals 12 (FSR+) and 13 (FSR-) of connector B.

    NOTICE:
    Do not forcibly insert SST into the terminals of the connector when connecting the wire.
SST
09843-18040

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    R2-11 (FSR+) - R2-12 (FSR-)
    		Always
    		Below 1 Ω


NG
Go to step 7
OK


4.CHECK OCCUPANT CLASSIFICATION SYSTEM CIRCUIT (SHORT)


    Corolla. Zre142 Aze141.Supplemental Restraint Systems.Airbag System. Dtc B1650/32 Occupant Classification System Malfunction

  1. Disconnect SST from connector B.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    R2-11 (FSR+) - R2-12 (FSR-)
    		Always
    		1 MΩ or higher


NG
Go to step 8
OK


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


    Corolla. Zre142 Aze141.Supplemental Restraint Systems.Airbag System. 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
    R2-11 (FSR+) - Body ground
    		Ignition switch ON
    		Below 1 V
    R2-12 (FSR-) - Body ground
    		Ignition switch ON
    		Below 1 V


NG
Go to step 9
OK


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


    Corolla. Zre142 Aze141.Supplemental Restraint Systems.Airbag System. Dtc B1650/32 Occupant Classification System Malfunction

  1. Turn the ignition switch off.

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

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    R2-11 (FSR+) - Body ground
    		Always
    		1 MΩ or higher
    R2-12 (FSR-) - Body ground
    		Always
    		1 MΩ or higher
    HINT:
    After replacing the center airbag sensor assembly, check for DTCs of the center airbag sensor assembly. If DTC B1650/32 is detected, replace the occupant classification ECU (COROLLA_ZRE142 RM0000011JG03CX.html) and perform the zero point calibration and sensitivity check of the occupant classification system (COROLLA_ZRE142 RM0000010VN07SX.html).


NG
Go to step 10
OK

REPLACE CENTER AIRBAG SENSOR ASSEMBLY (COROLLA_ZRE142 RM000000UWV074X.html)

7.CHECK NO. 2 FLOOR WIRE (OPEN)


  1. Disconnect the front seat wire RH connector from the No. 2 floor wire.


    Corolla. Zre142 Aze141.Supplemental Restraint Systems.Airbag System. Dtc B1650/32 Occupant Classification System Malfunction

    HINT:
    SST 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
    MR1-5 (FSR+) - MR1-10 (FSR-)
    		Always
    		Below 1 Ω


NG
REPLACE NO. 2 FLOOR WIRE
OK

REPLACE FRONT SEAT WIRE RH

8.CHECK NO. 2 FLOOR WIRE (SHORT)


    Corolla. Zre142 Aze141.Supplemental Restraint Systems.Airbag System. Dtc B1650/32 Occupant Classification System Malfunction

  1. Disconnect the front seat wire RH connector from the No. 2 floor wire.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    MR1-5 (FSR+) - MR1-10 (FSR-)
    		Always
    		1 MΩ or higher


NG
REPLACE NO. 2 FLOOR WIRE
OK

REPLACE FRONT SEAT WIRE RH

9.CHECK NO. 2 FLOOR WIRE (SHORT TO B+)


    Corolla. Zre142 Aze141.Supplemental Restraint Systems.Airbag System. Dtc B1650/32 Occupant Classification System Malfunction

  1. Turn the ignition switch off.

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

  1. Disconnect the front seat wire RH connector from the No. 2 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
    MR1-5 (FSR+) - Body ground
    		Ignition switch ON
    		Below 1 V
    MR1-10 (FSR-) - Body ground
    		Ignition switch ON
    		Below 1 V


NG
REPLACE NO. 2 FLOOR WIRE
OK

REPLACE FRONT SEAT WIRE RH

10.CHECK NO. 2 FLOOR WIRE (SHORT TO GROUND)


    Corolla. Zre142 Aze141.Supplemental Restraint Systems.Airbag System. Dtc B1650/32 Occupant Classification System Malfunction

  1. Disconnect the front seat wire RH connector from the No. 2 floor wire.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    MR1-5 (FSR+) - Body ground
    		Always
    		1 MΩ or higher
    MR1-10 (FSR-) - Body ground
    		Always
    		1 MΩ or higher


NG
REPLACE NO. 2 FLOOR WIRE
OK

REPLACE FRONT SEAT WIRE RH