Dtc B1660/43 Passenger Airbag On/Off Indicator Circuit Malfunction

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

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK PASSENGER AIRBAG ON/OFF INDICATOR OPERATION

CHECK CONNECTION OF CONNECTORS

CHECK FRONT PASSENGER SEAT BELT WARNING LIGHT

CHECK INSTRUMENT PANEL WIRE (FOR OPEN)

CHECK INSTRUMENT PANEL WIRE (FOR SHORT)

CHECK INSTRUMENT PANEL WIRE (TO B+)

CHECK INSTRUMENT PANEL WIRE (TO GROUND)

CHECK CONNECTION OF CONNECTORS

CHECK INSTRUMENT PANEL WIRE (FOR OPEN)

CHECK INSTRUMENT PANEL WIRE (FOR SHROT)

CHECK INSTRUMENT PANEL WIRE (TO B+)

CHECK INSTRUMENT PANEL WIRE (TO GROUND)

CHECK WIRE HARNESS (POWER SOURCE)

CHECK FRONT PASSENGER SEAT BELT WARNING LIGHT

CHECK CENTER AIRBAG SENSOR ASSEMBLY

DTC B1660/43 Passenger Airbag ON/OFF Indicator Circuit Malfunction


DESCRIPTION

The passenger airbag ON/OFF indicator circuit consists of the center airbag sensor assembly and the front passenger seat belt warning light.
This circuit indicates the operation condition of the front passenger airbag assembly, the front passenger side front seat side airbag assembly and passenger side seat belt pretensioner.
DTC B1660/43 is set when a malfunction is detected in the passenger airbag ON/OFF indicator circuit.

DTC No.
DTC Detecting Conditions
Trouble Areas
B1660/43
  1. Center airbag sensor assembly detects line short circuit signal, open circuit signal, short circuit to ground signal or short circuit to B+ signal in passenger airbag ON/OFF indicator circuit for 2 seconds
  2. Front passenger seat belt warning light malfunction
  3. Center airbag sensor assembly malfunction
  1. Instrument panel wire
  2. Front passenger seat belt warning light (Passenger airbag ON/OFF Indicator)
  3. Center airbag sensor assembly

WIRING DIAGRAM


Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). Dtc B1660/43 Passenger Airbag On/Off Indicator Circuit Malfunction


INSPECTION PROCEDURE

NOTICE:
In order to prevent unexpected airbag deployment, disconnect the following connectors before inspecting parts such as wire harnesses, if the application of tester probes to the center airbag sensor assembly connector is necessary.
  1. Turn the ignition switch to the lock position.
  2. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
  3. Disconnect the connector from the center airbag sensor assembly.
  4. Disconnect the connectors from the steering pad.
  5. Disconnect the connectors from the front passenger airbag assembly.
  6. Disconnect the connector from the front seat outer belt assembly LH.
  7. Disconnect the connector from the front seat outer belt assembly RH.
    HINT:
    Skip the following steps if side and curtain shield airbags are not fitted.
  8. Disconnect the connector from the front seat side airbag assembly LH.
  9. Disconnect the connector from the front seat side airbag assembly RH.
  10. Disconnect the connector from the curtain shield airbag assembly LH.
  11. Disconnect the connector from the curtain shield airbag assembly RH.
1.CHECK PASSENGER AIRBAG ON/OFF INDICATOR OPERATION

  1. Turn the ignition switch to the on position.



  1. Check the passenger airbag ON/OFF indicator operation.

    HINT:
    Refer to the normal condition of the passenger airbag ON/OFF indicator (YARIS_NCP93 RM000000XFD0CVX.html).

    Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). Dtc B1660/43 Passenger Airbag On/Off Indicator Circuit Malfunction


    Result:

    ON/OFF Indicator Illumination
    		Proceed To
    Always ON
    		A
    OFF
    		B


B
Go to step 8
A


2.CHECK CONNECTION OF CONNECTORS

  1. Turn the ignition 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 front passenger seat belt warning light.

    OK:
    The connectors are properly connected.


NG
CONNECT CONNECTORS
OK


3.CHECK FRONT PASSENGER SEAT BELT WARNING LIGHT


    Yaris. Ncp93, 131

  1. Turn the ignition switch off.

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

  1. Disconnect the connector from the center airbag sensor assembly.

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

  1. Turn the ignition switch to the on position.

  1. Check the passenger airbag ON/OFF indicator operation.

    OK:
    Neither ON nor OFF passenger airbag ON/OFF indicator comes on.


OK
Go to step 14
NG


4.CHECK INSTRUMENT PANEL WIRE (FOR OPEN)

  1. Turn the ignition switch off.

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



    Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). Dtc B1660/43 Passenger Airbag On/Off Indicator Circuit Malfunction

  1. Disconnect the connector from the front passenger seat belt warning light.

  1. Using a service wire, connect D77-9 (PAON) and D77-10 (P-AB) of connector C.

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

  1. Measure the resistance.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    D16-23 (PAON) - D16-17 (P-AB)
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE INSTRUMENT PANEL WIRE
OK


5.CHECK INSTRUMENT PANEL WIRE (FOR SHORT)
Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). Dtc B1660/43 Passenger Airbag On/Off Indicator Circuit Malfunction

  1. Disconnect the service wire from connector C.

  1. Measure the resistance.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    D16-17 (P-AB) - D16-23 (PAON)
    		Always
    		1 MΩ or Higher


NG
REPAIR OR REPLACE INSTRUMENT PANEL WIRE
OK


6.CHECK INSTRUMENT PANEL WIRE (TO B+)
Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). Dtc B1660/43 Passenger Airbag On/Off Indicator Circuit Malfunction

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

  1. Turn the ignition switch to the on position.

  1. Measure the voltage.

    Standard voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D16-23 (PAON) - Body ground
    		Ignition switch ON
    		Below 1 V
    D16-17 (P-AB) -Body ground
    		Ignition switch ON
    		Below 1 V


NG
REPAIR OR REPLACE INSTRUMENT PANEL WIRE
OK


7.CHECK INSTRUMENT PANEL WIRE (TO GROUND)
Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). Dtc B1660/43 Passenger Airbag On/Off Indicator Circuit Malfunction

  1. Turn the ignition switch off.

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

  1. Measure the resistance.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    D16-17 (P-AB) -Body ground
    		Always
    		1 MΩ or Higher
    D16-23 (PAON) -Body ground
    		Always
    		1 MΩ or Higher


NG
REPAIR OR REPLACE INSTRUMENT PANEL WIRE
OK

REPLACE FRONT PASSENGER SEAT BELT WARNING LIGHT

8.CHECK CONNECTION OF CONNECTORS

  1. Turn the ignition 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 front passenger seat belt warning light.

    OK:
    The connectors are properly connected.


NG
CONNECT CONNECTORS
OK


9.CHECK INSTRUMENT PANEL WIRE (FOR OPEN)

  1. Turn the ignition switch off.

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



    Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). Dtc B1660/43 Passenger Airbag On/Off Indicator Circuit Malfunction

  1. Disconnect the connector from the front passenger seat belt warning light.

  1. Using a service wire, connect D77-9 (PAON) and D77-10 (P-AB) of connector C.

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

  1. Measure the resistance.

Standard resistance:
Tester Connection
Condition
Specified Condition
D16-23 (PAON) - D16-17 (P-AB)
Always
Below 1 Ω


NG
REPAIR OR REPLACE INSTRUMENT PANEL WIRE
OK


10.CHECK INSTRUMENT PANEL WIRE (FOR SHROT)
Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). Dtc B1660/43 Passenger Airbag On/Off Indicator Circuit Malfunction

  1. Disconnect the service wire from connector B.

  1. Measure the resistance.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    D16-17 (P-AB) - D16-23 (PAON)
    		Always
    		1 MΩ or Higher


NG
REPAIR OR REPLACE INSTRUMENT PANEL WIRE
OK


11.CHECK INSTRUMENT PANEL WIRE (TO B+)
Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). Dtc B1660/43 Passenger Airbag On/Off Indicator Circuit Malfunction

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

  1. Turn the ignition switch to the on position.

  1. Measure the voltage.

    Standard voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D16-23 (PAON) - Body ground
    		Ignition switch ON
    		Below 1 V
    D16-17 (P-AB) - Body ground
    		Ignition switch ON
    		Below 1 V


NG
REPAIR OR REPLACE INSTRUMENT PANEL WIRE
OK


12.CHECK INSTRUMENT PANEL WIRE (TO GROUND)
Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). Dtc B1660/43 Passenger Airbag On/Off Indicator Circuit Malfunction

  1. Turn the ignition switch off.

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

  1. Measure the resistance.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    D16-17 (P-AB) - Body ground
    		Always
    		1 MΩ or Higher
    D16-23 (PAON) - Body ground
    		Always
    		1 MΩ or Higher


NG
REPAIR OR REPLACE INSTRUMENT PANEL WIRE
OK


13.CHECK WIRE HARNESS (POWER SOURCE)

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

  1. Turn the ignition switch to the on position.



    Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). Dtc B1660/43 Passenger Airbag On/Off Indicator Circuit Malfunction

  1. Measure the voltage.

    Standard voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D77-6 (IG+) - Body ground
    		Ignition switch ON
    		11 to 14 V


NG
REPAIR OR REPLACE POWER SOURCE CIRCUIT
OK


14.CHECK FRONT PASSENGER SEAT BELT WARNING LIGHT

  1. Turn the ignition switch off.



    Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). Dtc B1660/43 Passenger Airbag On/Off Indicator Circuit Malfunction

  1. Using a service wire, connect D77-9 (PAON) and D77-4 (E) of the front passenger seat belt warning light connector.

  1. Using a service wire, connect D77-10 (P-AB) and D77-4 (E) of the front passenger seat belt warning light connector.

  1. Turn the ignition switch to the on position.

  1. Check the passenger airbag ON/OFF indicator operation.

    OK:
    Passenger airbag ON/OFF indicator comes on


NG
REPLACE FRONT PASSENGER SEAT BELT WARNING LIGHT
OK


15.CHECK CENTER AIRBAG SENSOR ASSEMBLY
Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). Dtc B1660/43 Passenger Airbag On/Off Indicator Circuit Malfunction

  1. Turn the ignition switch off.

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

  1. Connect the connector to the center airbag sensor assembly.

  1. Connect the connector to the front passenger seat belt warning light.

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

  1. Turn the ignition switch to the on position, and wait for at least 60 seconds.

  1. Clear the DTCs stored in the memory (YARIS_NCP93 RM000000XFE0D2X.html).

  1. Turn the ignition switch to the lock position.

  1. Turn the ignition switch to the on position, and wait for at least 60 seconds.

  1. Check for DTCs (YARIS_NCP93 RM000000XFE0D2X.html).

    OK:
    DTC B1660/43 is not output.
    HINT:
    DTCs other than B1660/43 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