Dtc B1617/84 Lost Communication With Front Airbag Sensor Lh

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

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK CONNECTORS

CHECK FRONT AIRBAG SENSOR LH CIRCUIT (OPEN)

CHECK FRONT AIRBAG SENSOR LH CIRCUIT (SHORT)

CHECK FRONT AIRBAG SENSOR LH CIRCUIT (SHORT TO B+)

CHECK FRONT AIRBAG SENSOR LH CIRCUIT (SHORT TO GROUND)

CHECK FRONT AIRBAG SENSOR LH

CHECK INSTRUMENT PANEL WIRE (OPEN)

CHECK INSTRUMENT PANEL WIRE (SHORT)

CHECK INSTRUMENT PANEL WIRE (SHORT TO B+)

CHECK INSTRUMENT PANEL WIRE (SHORT TO GROUND)

DTC B1617/84 Lost Communication with Front Airbag Sensor LH

DTC B1618/84 Front Airbag Sensor LH Initialization Incomplete


DESCRIPTION

The front airbag sensor LH circuit consists of the airbag sensor assembly and front airbag sensor LH.
The front airbag sensor LH detects impacts to the vehicle and sends signals to the airbag sensor assembly to determine if the airbag should be deployed.
These DTCs are stored when a malfunction is detected in the front airbag sensor LH circuit.

DTC No.
DTC Detection Condition
Trouble Area
B1617/84
B1618/84
  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 front airbag sensor LH circuit.
  2. Front airbag sensor LH malfunction
  3. Airbag sensor assembly malfunction
  1. Instrument panel wire
  2. Engine room main wire
  3. Front airbag sensor LH
  4. Airbag sensor assembly

WIRING DIAGRAM


Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). Dtc B1617/84 Lost Communication With Front Airbag Sensor Lh


INSPECTION PROCEDURE

1.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 front airbag sensor LH. Also check that the connectors that link the engine room main wire and instrument panel 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 airbag sensor assembly and front airbag sensor LH. Also disconnect the connectors that link the engine room main wire and instrument panel 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


2.CHECK FRONT AIRBAG SENSOR LH CIRCUIT (OPEN)


  1. Connect the connectors that link the engine room main wire and instrument panel wire.


    Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). Dtc B1617/84 Lost Communication With Front Airbag Sensor Lh


Text in Illustration
*1
Front Airbag Sensor LH
*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 Front Airbag Sensor LH)

  1. Using the service wire, connect terminals 30 (+SL) and 28 (-SL) of connector B.

    NOTICE:
    Do not forcibly insert SST 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
    A57-2 (+SL) - A57-1 (-SL)
    		Always
    		Below 1 Ω


NG
Go to step 7
OK


3.CHECK FRONT AIRBAG SENSOR LH CIRCUIT (SHORT)


    Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). Dtc B1617/84 Lost Communication With Front Airbag Sensor Lh

  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
    A57-2 (+SL) - A57-1 (-SL)
    		Always
    		1 MΩ or higher
    Text in Illustration
    *1
    		Front Airbag Sensor LH
    *2
    		Airbag Sensor Assembly
    *3
    		Connector E
    *a
    		Front view of wire harness connector
    (to Front Airbag Sensor LH)


NG
Go to step 8
OK


4.CHECK FRONT AIRBAG SENSOR LH CIRCUIT (SHORT TO B+)


    Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). Dtc B1617/84 Lost Communication With Front Airbag Sensor Lh

  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
    A57-2 (+SL) - Body ground
    		Ignition switch ON
    		Below 1 V
    A57-1 (-SL) - Body ground
    		Ignition switch ON
    		Below 1 V
    Text in Illustration
    *1
    		Front Airbag Sensor LH
    *2
    		Airbag Sensor Assembly
    *3
    		Connector E
    *a
    		Front view of wire harness connector
    (to Front Airbag Sensor LH)


NG
Go to step 9
OK


5.CHECK FRONT AIRBAG SENSOR LH CIRCUIT (SHORT TO GROUND)


    Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). Dtc B1617/84 Lost Communication With Front Airbag Sensor Lh

  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
    A57-2 (+SL) - Body ground
    		Always
    		1 MΩ or higher
    A57-1 (-SL) - Body ground
    		Always
    		1 MΩ or higher
    Text in Illustration
    *1
    		Front Airbag Sensor LH
    *2
    		Airbag Sensor Assembly
    *3
    		Connector E
    *a
    		Front view of wire harness connector
    (to Front Airbag Sensor LH)


NG
Go to step 10
OK


6.CHECK FRONT AIRBAG SENSOR LH


    Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). Dtc B1617/84 Lost Communication With Front Airbag Sensor Lh

  1. Connect the connector to the airbag sensor assembly.

  1. Interchange the front airbag sensor LH with RH and connect the connectors.

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

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

  1. Clear the DTCs stored in 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).

    Result
    Result
    		Proceed to
    DTCs B1612/83, B1613/83, B1617/84 and B1618/84 are not output.
    		A
    DTC B1617/84 or B1618/84 is output.
    		B
    DTC B1612/83 or B1613/83 is output.
    		C
    Text in Illustration
    *1
    		Front Airbag Sensor RH
    *2
    		Airbag Sensor Assembly
    HINT:
    Codes other than DTCs B1612/83, B1613/83, B1617/84 and B1618/84, may be output at this time, but they are not related to this check.

  1. Return the front airbag assembly LH and the front airbag assembly RH to their original positions and connect the connector to them.



B
REPLACE AIRBAG SENSOR ASSEMBLY (YARIS_NCP93 RM000000V6U02AX.html)

C
REPLACE FRONT AIRBAG SENSOR LH (YARIS_NCP93 RM000000VKQ02RX.html)
A

USE SIMULATION METHOD TO CHECK (YARIS_NCP93 RM00000135202EX.html)

7.CHECK INSTRUMENT PANEL WIRE (OPEN)


  1. Disconnect the instrument panel wire connector from the engine room main wire.


    Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). Dtc B1617/84 Lost Communication With Front Airbag Sensor Lh


    Text in Illustration
    *1
    		Front Airbag Sensor LH
    		*2
    		Airbag Sensor Assembly
    *3
    		Engine Room Main Wire
    		*4
    		Instrument Panel 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 Engine Room Main Wire)
    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
    AD6-3 (+SL) - AD6-4 (-SL)
    		Always
    		Below 1 Ω


NG
REPLACE INSTRUMENT PANEL WIRE
OK

REPLACE ENGINE ROOM MAIN WIRE

8.CHECK INSTRUMENT PANEL WIRE (SHORT)


    Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). Dtc B1617/84 Lost Communication With Front Airbag Sensor Lh

  1. Disconnect the instrument panel wire connector from the engine room main wire.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    AD6-3 (+SL) - AD6-4 (-SL)
    		Always
    		1 MΩ or higher
    Text in Illustration
    *1
    		Front Airbag Sensor LH
    *2
    		Airbag Sensor Assembly
    *3
    		Engine Room Main Wire
    *4
    		Instrument Panel Wire
    *5
    		Connector C
    *a
    		Front view of wire harness connector
    (to Engine Room Main Wire)


NG
REPLACE INSTRUMENT PANEL WIRE
OK

REPLACE ENGINE ROOM MAIN WIRE

9.CHECK INSTRUMENT PANEL WIRE (SHORT TO B+)


    Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). Dtc B1617/84 Lost Communication With Front Airbag Sensor Lh

  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 instrument panel wire connector from the engine room main 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
    AD6-3 (+SL) - Body ground
    		Ignition switch ON
    		Below 1 V
    AD6-4 (-SL) - Body ground
    		Ignition switch ON
    		Below 1 V
    Text in Illustration
    *1
    		Front Airbag Sensor LH
    *2
    		Airbag Sensor Assembly
    *3
    		Engine Room Main Wire
    *4
    		Instrument Panel Wire
    *5
    		Connector C
    *a
    		Front view of wire harness connector
    (to Engine Room Main Wire)


NG
REPLACE INSTRUMENT PANEL WIRE
OK

REPLACE ENGINE ROOM MAIN WIRE

10.CHECK INSTRUMENT PANEL WIRE (SHORT TO GROUND)


    Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). Dtc B1617/84 Lost Communication With Front Airbag Sensor Lh

  1. Disconnect the instrument panel wire connector from the engine room main wire.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    AD6-3 (+SL) - Body ground
    		Always
    		1 MΩ or higher
    AD6-4 (-SL) - Body ground
    		Always
    		1 MΩ or higher
    Text in Illustration
    *1
    		Front Airbag Sensor LH
    *2
    		Airbag Sensor Assembly
    *3
    		Engine Room Main Wire
    *4
    		Instrument Panel Wire
    *5
    		Connector C
    *a
    		Front view of wire harness connector
    (to Engine Room Main Wire)


NG
REPLACE INSTRUMENT PANEL WIRE
OK

REPLACE ENGINE ROOM MAIN WIRE