DTC    B1650/32    Occupant Detection Sensor Circuit Malfunction

for Preparation Click here


DESCRIPTION

The occupant detection sensor circuit consists of the center airbag sensor assembly and the occupant detection sensor.
If the center airbag sensor assembly receives signals from the occupant detection sensor, it determines whether or not the front passenger airbag assembly and the front passenger side-side airbag should be operated.
DTC B1650/32 is recorded when a malfunction is detected in the occupant detection sensor circuit.

DTC No.
DTC Detecting Condition
Trouble Area
B1650/32
  1. The center 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 detection sensor circuit for 2 seconds.
  2. Occupant detection sensor malfunction
  3. Center airbag sensor assembly malfunction
  1. Floor wire (LHD)
  2. Floor wire No.2 (RHD)
  3. Occupant detection sensor
  4. Center airbag sensor assembly

WIRING DIAGRAM


C111943E03


INSPECTION PROCEDURE

1.CHECK DTC


    C111948E01

  1. Turn the engine switch on (IG), and wait for at least 60 seconds.

  1. Clear the DTCs stored in memory (Click here).

  1. Turn the engine switch off.

  1. Turn the engine switch on (IG), and wait for at least 60 seconds.

  1. Check the DTCs (Click here).

    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.



OK
USE SIMULATION METHOD TO CHECK
NG


2.CHECK CONNECTION OF CONNECTORS

  1. Turn the engine switch off.

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

  1. Check that the connectors are properly connected to the center airbag sensor assembly and the occupant detection sensor.

    OK:
    The connectors are connected.



NG
CONNECT CONNECTORS, THEN GO TO STEP 1
OK


3.CHECK VEHICLE STEERING POSITION

  1. Confirm that the vehicle steering position.

    Result:

    Result
    		Proceed to
    LHD
    		A
    RHD
    		B



B
Go to step 8
A


4.CHECK FLOOR WIRE (OPEN)


    C109487E02

  1. Disconnect the connectors from the center airbag sensor assembly and the occupant detection sensor.

  1. Using a service wire, connect V13-9 (FSR+) and V13-17 (FSR-) of connector "B".

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

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

    Resistance:
    Tester connection
    		Condition
    		Specified condition
    V39-2 (FSR+) -
    V39-4 (FSR-)
    		Always
    		Below 1 Ω



NG
REPAIR OR REPLACE FLOOR WIRE
OK


Go to step 4

5.CHECK FLOOR WIRE (SHORT)


    C109488E03

  1. Disconnect the service wire from connector "B".

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

    Resistance:
    Tester connection
    		Condition
    		Specified condition
    V39-2 (FSR+) -
    V39-4 (FSR-)
    		Always
    		1 MΩ or higher



NG
REPAIR OR REPLACE FLOOR WIRE
OK


Go to step 5

6.CHECK FLOOR WIRE (SHORT TO B+)


    C109488E03

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

  1. Turn the engine switch on (IG).

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

    Voltage:
    Tester connection
    		Condition
    		Specified condition
    V39-2 (FSR+) -
    Body ground
    		Engine switch on (IG)
    		Below 1 V
    V39-4 (FSR-) -
    Body ground
    		Engine switch on (IG)
    		Below 1 V



NG
REPAIR OR REPLACE FLOOR WIRE
OK


Go to step 6

7.CHECK FLOOR WIRE (SHORT TO GROUND)


    C109488E03

  1. Turn the engine switch off.

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

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

    Resistance:
    Tester connection
    		Condition
    		Specified condition
    V39-2 (FSR+) -
    Body ground
    		Always
    		1 MΩ or higher
    V39-4 (FSR-) -
    Body ground
    		Always
    		1 MΩ or higher



NG
REPAIR OR REPLACE FLOOR WIRE
OK

GO TO STEP 12 

8.CHECK FLOOR WIRE NO.2 (OPEN)


    C109491E02

  1. Disconnect the connectors from the center airbag sensor assembly and the occupant detection sensor.

  1. Using a service wire, connect W16-16 (FSL+) and W16-24 (FSL-) of connector "B".

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

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

    Resistance:
    Tester connection
    		Condition
    		Specified condition
    W4-2 (FSL+) -
    W4-4 (FSL-)
    		Always
    		Below 1 Ω



NG
REPAIR OR REPLACE FLOOR WIRE NO.2
OK


9.CHECK FLOOR WIRE NO.2 (SHORT)


    C109492E03

  1. Disconnect the service wire from connector "B".

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

    Resistance:
    Tester connection
    		Condition
    		Specified condition
    W4-2 (FSL+) -
    W4-4 (FSL-)
    		Always
    		1 MΩ or higher



NG
REPAIR OR REPLACE FLOOR WIRE NO.2
OK


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


    C109492E03

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

  1. Turn the engine switch on (IG).

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

    Voltage:
    Tester connection
    		Condition
    		Specified condition
    W4-2 (FSL+) -
    Body ground
    		Engine switch on (IG)
    		Below 1 V
    W4-4 (FSL-) -
    Body ground
    		Engine switch on (IG)
    		Below 1 V



NG
REPAIR OR REPLACE FLOOR WIRE NO.2
OK


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


    C109492E03

  1. Turn the engine switch off.

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

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

    Resistance:
    Tester connection
    		Condition
    		Specified condition
    W4-2 (FSL+) -
    Body ground
    		Always
    		1 MΩ or higher
    W4-4 (FSL-) -
    Body ground
    		Always
    		1 MΩ or higher



NG
REPAIR OR REPLACE FLOOR WIRE NO.2
OK


12.CHECK OCCUPANT DETECTION SENSOR


    C111949E02

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

    NOTICE:
    Connect the positive tester lead to terminal FSR+ (FSL+), and the negative tester lead to terminal FSR- (FSL-).

    Resistance:
    Tester connection
    		Condition
    		Specified condition
    V39-2 (FSR+) -
    V39-4 (FSR-) (*1)
    		Passenger is not seated
    		Below 50 kΩ
    V39-2 (FSR+) -
    V39-4 (FSR-) (*1)
    		Passenger is seated
    		50 kΩ or higher
    W4-2 (FSL+) -
    W4-4 (FSL-) (*2)
    		Passenger is not seated
    		Below 50 kΩ
    W4-2 (FSL+) -
    W4-4 (FSL-) (*2)
    		Passenger is seated
    		50 kΩ or higher

    *1: LHD
    *2: RHD



NG
REPLACE OCCUPANT DETECTION SENSOR
OK


13.CHECK CENTER AIRBAG SENSOR ASSEMBLY


    C111948E01

  1. Connect the connectors to the center airbag sensor assembly and the occupant detection sensor.

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

  1. Turn the engine switch on (IG), and wait for at least 60 seconds.

  1. Clear the DTCs stored in memory (Click here).

  1. Turn the engine switch off.

  1. Turn the engine switch on (IG), and wait for at least 60 seconds.

  1. Check the DTCs (Click here).

    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
REPLACE CENTER AIRBAG SENSOR ASSEMBLY
OK

USE SIMULATION METHOD TO CHECK