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 TELLTALE LIGHT ASSEMBLY (PASSENGER AIRBAG ON/OFF INDICATOR CONDITION)

CHECK CONNECTION OF CONNECTORS

CHECK CONNECTORS

CHECK TELLTALE LIGHT ASSEMBLY (PASSENGER AIRBAG ON/OFF INDICATOR)

CHECK DTC

CHECK INSTRUMENT PANEL WIRE (AIRBAG SENSOR ASSEMBLY - TELLTALE LIGHT ASSEMBLY)

CHECK CONNECTION OF CONNECTORS

CHECK CONNECTORS

CHECK INSTRUMENT PANEL WIRE (AIRBAG SENSOR ASSEMBLY - TELLTALE LIGHT ASSEMBLY)

CHECK TELLTALE LIGHT ASSEMBLY (PASSENGER AIRBAG ON/OFF INDICATOR SOURCE VOLTAGE)

CHECK TELLTALE LIGHT ASSEMBLY (PASSENGER AIRBAG ON/OFF INDICATOR)

CHECK DTC

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


DESCRIPTION

The passenger airbag ON/OFF indicator circuit consists of the airbag sensor assembly and the telltale light assembly (Passenger airbag ON/OFF indicator).
The passenger airbag ON/OFF indicator indicates the operation condition of the front passenger airbag.
DTC B1660/43 is recorded when a malfunction is detected in the passenger airbag ON/OFF indicator circuit.

DTC No.
DTC Detection Condition
Trouble Area
B1660/43
When one of following conditions is met:
  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 passenger airbag ON/OFF indicator circuit for 2 seconds.
  2. Telltale light assembly (Passenger airbag ON/OFF indicator) malfunction
  3. Airbag sensor assembly malfunction
  1. Instrument panel wire
  2. Telltale Light Assembly (Passenger airbag ON/OFF indicator)
  3. 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:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
1.CHECK TELLTALE LIGHT ASSEMBLY (PASSENGER AIRBAG ON/OFF INDICATOR CONDITION)

  1. Turn the ignition switch to ON.



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

    HINT:
    Refer to the normal condition of the passenger airbag ON/OFF indicator (YARIS_NCP93 RM000000XFD0E4X.html).

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


    Result
    Result
    		Proceed to
    Always ON
    		A
    OFF
    		B


B
Go to step 7
A


2.CHECK CONNECTION OF 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 the telltale light assembly.

    OK:
    The connectors are properly connected.


NG
CONNECT CONNECTORS PROPERLY
OK


3.CHECK CONNECTORS

  1. Disconnect the connectors from the airbag sensor assembly and the telltale light assembly.

  1. Check that the connectors (on the airbag sensor assembly side and telltale light assembly side) are not damaged.

    OK:
    The connectors are not deformed or damaged.


NG
REPLACE INSTRUMENT PANEL WIRE
OK


4.CHECK TELLTALE LIGHT ASSEMBLY (PASSENGER AIRBAG ON/OFF INDICATOR)
Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). Dtc B1660/43 Passenger Airbag On/Off Indicator Circuit Malfunction

  1. Connect the connector to the telltale light assembly.

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

  1. Turn the ignition switch to ON.

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

    OK:
    The passenger airbag ON/OFF indicator does not come on.
    Text in Illustration
    *1
    		Telltale Light Assembly (Passenger Airbag ON/OFF Indicator)


NG
Go to step 6
OK


5.CHECK DTC

  1. Connect the connector to the 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 ON, and wait for at least 60 seconds.

  1. Clear the DTCs stored in the memory (YARIS_NCP93 RM000000XFE0EEX.html).

  1. Turn the ignition switch off.

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

  1. Check for DTCs (YARIS_NCP93 RM000000XFE0EEX.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 AIRBAG SENSOR ASSEMBLY (YARIS_NCP93 RM000000V6U02AX.html)
OK

USE SIMULATION METHOD TO CHECK (YARIS_NCP93 RM00000135202EX.html)

6.CHECK INSTRUMENT PANEL WIRE (AIRBAG SENSOR ASSEMBLY - TELLTALE LIGHT ASSEMBLY)

  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 connectors from the telltale light assembly and airbag sensor assembly.


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


    Text in Illustration
    *1
    		Telltale Light Assembly (Passenger Airbag ON/OFF Indicator)
    		*2
    		Airbag Sensor Assembly
    *3
    		Instrument Panel Wire
    		*4
    		Connector C
    *5
    		Connector B
    		*6
    		Service Wire
    *a
    		Front view of wire harness connector
    (to Telltale Light Assembly)
    		*b
    		Front view of wire harness connector
    (to Airbag Sensor Assembly)

  1. Using the service wire, connect terminals 23 (PAON) and 17 (P-AB) of connector B.

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

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    D115-2 (PAON) - D115-3 (P-AB)
    		Always
    		Below 1 Ω

  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
    D115-2 (PAON) - D115-3 (P-AB)
    		Always
    		1 MΩ or higher
    D115-2 (PAON) - Body ground
    		Always
    		1 MΩ or higher
    D115-3 (P-AB) - Body ground
    		Always
    		1 MΩ or higher

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

  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
    D115-2 (PAON) - Body ground
    		Ignition switch ON
    		Below 1 V
    D115-3 (P-AB) - Body ground
    		Ignition switch ON
    		Below 1 V


NG
REPLACE INSTRUMENT PANEL WIRE
OK

REPLACE TELLTALE LIGHT ASSEMBLY (YARIS_NCP93 RM000004O2B00AX.html)

7.CHECK CONNECTION OF 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 the telltale light assembly.

    OK:
    The connectors are properly connected.


NG
CONNECT CONNECTORS PROPERLY
OK


8.CHECK CONNECTORS

  1. Disconnect the connectors from the airbag sensor assembly and the telltale light assembly.

  1. Check that the connectors (on the airbag sensor assembly side and telltale light assembly side) are not damaged.

    OK:
    The connectors are not deformed or damaged.


NG
REPLACE INSTRUMENT PANEL WIRE
OK


9.CHECK INSTRUMENT PANEL WIRE (AIRBAG SENSOR ASSEMBLY - TELLTALE LIGHT ASSEMBLY)

  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 connectors from the telltale light assembly and airbag sensor assembly.


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


    Text in Illustration
    *1
    		Telltale Light Assembly (Passenger Airbag ON/OFF Indicator)
    		*2
    		Airbag Sensor Assembly
    *3
    		Instrument Panel Wire
    		*4
    		Connector C
    *5
    		Connector B
    		*6
    		Service Wire
    *a
    		Front view of wire harness connector
    (to Telltale Light Assembly)
    		*b
    		Front view of wire harness connector
    (to Airbag Sensor Assembly)

  1. Using the service wire, connect terminals 23 (PAON) and 17 (P-AB) of connector B.

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

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    D115-2 (PAON) - D115-3 (P-AB)
    		Always
    		Below 1 Ω

  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
    D115-2 (PAON) - D115-3 (P-AB)
    		Always
    		1 MΩ or higher
    D115-2 (PAON) - Body ground
    		Always
    		1 MΩ or higher
    D115-3 (P-AB) - Body ground
    		Always
    		1 MΩ or higher

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

  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
    D115-2 (PAON) - Body ground
    		Ignition switch ON
    		Below 1 V
    D115-3 (P-AB) - Body ground
    		Ignition switch ON
    		Below 1 V


NG
REPLACE INSTRUMENT PANEL WIRE
OK


10.CHECK TELLTALE LIGHT ASSEMBLY (PASSENGER AIRBAG ON/OFF INDICATOR SOURCE VOLTAGE)
Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). Dtc B1660/43 Passenger Airbag On/Off Indicator Circuit Malfunction

  1. Connect the connectors to the 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 ON.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D115-8 (LAPB) - Body ground
    		Ignition switch ON
    		11 to 14 V
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Telltale Light Assembly)


NG
REPLACE HARNESS AND CONNECTOR (TELLTALE LIGHT ASSEMBLY - BATTERY)
OK


11.CHECK TELLTALE LIGHT ASSEMBLY (PASSENGER AIRBAG ON/OFF INDICATOR)
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 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. Connect the connector to the telltale light assembly.

  1. Disconnect the connectors from the 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 ON.

  1. Check the indicator according to the value(s) in the table below.

    OK:
    Tester Connection
    		Switch Condition
    		Passenger airbag ON/OFF indicator
    D112-23 (PAON) - Body ground
    		Ignition switch ON
    		"ON" comes on
    D112-17 (P-AB) - Body ground
    		Ignition switch ON
    		"OFF" comes on
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Airbag Sensor Assembly)


NG
REPLACE TELLTALE LIGHT ASSEMBLY (YARIS_NCP93 RM000004O2B00AX.html)
OK


12.CHECK DTC

  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. Connect the connectors to the 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 ON, and wait for at least 60 seconds.

  1. Clear the DTCs stored in the memory (YARIS_NCP93 RM000000XFE0EEX.html).

  1. Turn the ignition switch off.

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

  1. Check for DTCs (YARIS_NCP93 RM000000XFE0EEX.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 AIRBAG SENSOR ASSEMBLY (YARIS_NCP93 RM000000V6U02AX.html)
OK

USE SIMULATION METHOD TO CHECK (YARIS_NCP93 RM00000135202EX.html)