DTC    B1617/84    Lost Communication with Front Airbag Sensor LH

DTC    B1618/84    Front Airbag Sensor LH Initialization Incomplete

for Preparation Click here


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 to determine if the airbag should be deployed.
DTC B1617/84 or B1618/84 is recorded when a malfunction is detected in the front airbag sensor LH circuit.

DTC No.
DTC Detection Condition
Trouble Area
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
  2. Engine room main wire
  3. Front airbag sensor LH
  4. Center airbag sensor assembly

WIRING DIAGRAM


C162318E18


INSPECTION PROCEDURE

1.CHECK CONNECTION OF CONNECTORS

  1. Turn the ignition switch off.

  1. Disconnect the cable from the negative (-) battery terminal, 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 PROPERLY
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

C195580E05


Text in Illustration 
*a
Front view of wire harness connector
(to Front Airbag Sensor LH)
*b
Rear view of wire harness connector
(to Center Airbag Sensor Assembly)
*c
Front Airbag Sensor LH
*d
Center Airbag Sensor Assembly
*e
Connector E
*f
Connector B
*g
Service Wire
-
-

  1. Connect the cable to the negative battery terminal, 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
    A5-2 (+SL) - Body ground
    		Ignition switch ON
    		Below 1 V
    A5-1 (-SL) - Body ground
    		Ignition switch ON
    		Below 1 V

  1. Turn the ignition switch off.

  1. Disconnect the cable from the negative (-) battery terminal, 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
    A5-2 (+SL) - A5-1 (-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
    A5-2 (+SL) - A5-1 (-SL)
    		Always
    		1 MΩ or higher
    A5-2 (+SL) - Body ground
    		Always
    		1 MΩ or higher
    A5-1 (-SL) - Body ground
    		Always
    		1 MΩ or higher



NG
Go to step 5
OK


4.CHECK FRONT AIRBAG SENSOR LH
C158831E13

  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 cable to the negative battery terminal, 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 (Click here).

  1. Turn the ignition switch off.

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

  1. Check for DTCs (Click here).
    Result 
    Result
    		Proceed to
    DTC B1617/84 or B1618/84 is output
    		A
    DTC B1612/83 or B1613/83 is output
    		B
    DTC B1612/83, B1613/83, B1617/84 and B1618/84 are not output
    		C
    Text in Illustration 
    *a
    		Front Airbag Sensor RH
    *b
    		Center Airbag Sensor Assembly

    HINT:
    DTCs other than B1612, B1613, B1617, B1618, 83 and 84 may be output at this time, but they are not related to this check.



A
REPLACE CENTER AIRBAG SENSOR ASSEMBLY (Click here)

B
REPLACE FRONT AIRBAG SENSOR LH (Click here)
C

USE SIMULATION METHOD TO CHECK (Click here)  

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

C195581E04


Text in Illustration 
*a
Front view of wire harness connector
(to Engine Room Main Wire)
*b
Rear view of wire harness connector
(to Center Airbag Sensor Assembly)
*c
Front Airbag Sensor LH
*d
Center Airbag Sensor Assembly
*e
Engine Room Main Wire
*f
Instrument Panel Wire
*g
Connector C
*h
Connector B
*i
Service Wire
-
-

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

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

REPLACE ENGINE ROOM MAIN WIRE