Dtc B1607/84 Lost Communication With Front Satellite Sensor Bus Lh

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

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK CONNECTION OF CONNECTORS

CHECK CONNECTORS

CHECK FRONT AIRBAG SENSOR LH CIRCUIT

CHECK FRONT AIRBAG SENSOR LH

CHECK INSTRUMENT PANEL WIRE ASSEMBLY (CENTER AIRBAG SENSOR - ENGINE ROOM MAIN WIRE)

DTC B1607/84 Lost Communication with Front Satellite Sensor Bus LH

DTC B1608/84 Front Satellite Sensor Bus LH Initialization Incomplete

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 center airbag sensor assembly and front airbag sensor LH.
The front airbag sensor LH detects impacts to the vehicle and sends signals to the center airbag sensor assembly to determine if the airbag should be deployed.
DTC B1607/84, B1608/84, B1617/84 or B1618/84 is recorded when a malfunction is detected in the front airbag sensor LH circuit.

DTC Code
Detection Condition
Trouble Area
B1607/84
B1608/84
B1617/84
B1618/84
When one of following conditions is met:
  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 front airbag sensor LH circuit for 2 seconds.
  2. Front airbag sensor LH malfunction
  3. Center airbag sensor assembly malfunction
  1. Instrument panel wire assembly
  2. Engine room main wire
  3. Front airbag sensor LH
  4. Center airbag sensor assembly

WIRING DIAGRAM


Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). Dtc B1607/84 Lost Communication With Front Satellite Sensor Bus Lh


INSPECTION PROCEDURE

1.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 airbag sensor LH.

    OK:
    The connectors are properly connected.


NG
CONNECT CONNECTORS
OK


2.CHECK CONNECTORS

  1. Disconnect the connectors from the center airbag sensor assembly and front airbag sensor LH.

  1. Check that the connectors (on the center airbag sensor assembly side and front airbag sensor LH side) are not damaged.

    OK:
    The connectors are not deformed or damaged.


NG
REPLACE HARNESS AND CONNECTOR
OK


3.CHECK FRONT AIRBAG SENSOR LH CIRCUIT

Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). Dtc B1607/84 Lost Communication With Front Satellite Sensor Bus Lh

  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
    A12-2 (+SL) - Body ground
    		Ignition switch ON
    		Below 1 V
    A12-1 (-SL) - Body ground
    		Ignition switch ON
    		Below 1 V

  1. Turn the ignition switch off.

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

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

    NOTICE:
    Do not forcibly insert a 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
    A12-2 (+SL) - A12-1 (-SL)
    		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
    A12-2 (+SL) - A12-1 (-SL)
    		Always
    		1 MΩ or higher
    A12-2 (+SL) - Body ground
    		Always
    		1 MΩ or higher
    A12-1 (-SL) - Body ground
    		Always
    		1 MΩ or higher


NG
Go to step 5
OK


4.CHECK FRONT AIRBAG SENSOR LH
Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). Dtc B1607/84 Lost Communication With Front Satellite Sensor Bus Lh

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

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

  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 RM000000XFE0D2X.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 RM000000XFE0D2X.html).

    Result
    Result
    		Proceed to
    DTC B1602/83, B1603/83, B1612/83, B1613/83, B1607/84, B1608/84, B1617/84 and B1618/84 are not output
    		A
    DTC B1602/83, B1603/83, B1612/83 or B1613/83 is output
    		B
    DTC B1607/84, B1608/84, B1617/84 or B1618/84 is output
    		C
    HINT:
    Codes other than DTC B1602, B1603, B1612, B1613, B1608, B1608, B1617, B1618, 83 and 84 may be output at this time, but they are not related to this check.


A
USE SIMULATION METHOD TO CHECK

B
REPLACE FRONT AIRBAG SENSOR LH
C

REPLACE CENTER AIRBAG SENSOR ASSEMBLY

5.CHECK INSTRUMENT PANEL WIRE ASSEMBLY (CENTER AIRBAG SENSOR - ENGINE ROOM MAIN WIRE)

Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). Dtc B1607/84 Lost Communication With Front Satellite Sensor Bus Lh

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

  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
    AD1-3 (+SL) - Body ground
    		Ignition switch ON
    		Below 1 V
    AD1-4 (-SL) - Body ground
    		Ignition switch ON
    		Below 1 V

  1. Turn the ignition switch off.

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

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

    NOTICE:
    Do not forcibly insert a 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
    AD1-3 (+SL) - AD1-4 (-SL)
    		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
    AD1-3 (+SL) - AD1-4 (-SL)
    		Always
    		1 MΩ or higher
    AD1-3 (+SL) - Body ground
    		Always
    		1 MΩ or higher
    AD1-4 (-SL) - Body ground
    		Always
    		1 MΩ or higher


NG
REPLACE INSTRUMENT PANEL WIRE ASSEMBLY
OK

REPLACE ENGINE ROOM MAIN WIRE