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 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


C145438E36


INSPECTION PROCEDURE

NOTICE:
After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work (Click here).

1.CHECK CONNECTORS

  1. Turn the power switch off.

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

    CAUTION:
    Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary 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.


    C190645E16

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

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

SST
09843-18040  

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A7-2 (+SL) - A7-1 (-SL)
    		Always
    		Below 1 Ω


    Text in Illustration 
    *1
    		Front Airbag Sensor LH
    		*2
    		Airbag Sensor Assembly
    *3
    		Connector B
    		*4
    		Connector E
    *a
    		Front view of wire harness connector
    (to Airbag Sensor Assembly)
    		*b
    		Front view of wire harness connector
    (to Front Airbag Sensor LH)



NG
Go to step 7
OK


3.CHECK FRONT AIRBAG SENSOR LH CIRCUIT (SHORT)


    C145444E40

  1. Disconnect SST from connector B.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A7-2 (+SL) - A7-1 (-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+)


    C145444E40

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

  1. Turn the power switch on (IG).

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A7-2 (+SL) - Body ground
    		Power switch on (IG)
    		Below 1 V
    A7-1 (-SL) - Body ground
    		Power switch on (IG)
    		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)


    C145444E40

  1. Turn the power switch off.

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

    CAUTION:
    Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary 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
    A7-2 (+SL) - Body ground
    		Always
    		1 MΩ or higher
    A7-1 (-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


    C190643E03

  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 (-) auxiliary battery terminal.

  1. Turn the power switch on (IG), and wait for at least 60 seconds.

  1. Clear the DTCs stored in memory (Click here).

  1. Turn the power switch off.

  1. Turn the power switch on (IG), and wait for at least 60 seconds.

  1. Check for DTCs (Click here).

    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.



B
REPLACE AIRBAG SENSOR ASSEMBLY (Click here)

C
REPLACE FRONT AIRBAG SENSOR LH (Click here)
A

USE SIMULATION METHOD TO CHECK (Click here)  

7.CHECK INSTRUMENT PANEL WIRE (OPEN)


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


    C190646E06

    HINT:
    SST 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
    AH4-1 (+SL) - AH4-2 (-SL)
    		Always
    		Below 1 Ω


    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
    *a
    		Front view of wire harness connector
    (to Airbag Sensor Assembly)
    		*b
    		Front view of wire harness connector
    (to Engine Room Main Wire)



NG
REPLACE INSTRUMENT PANEL WIRE
OK

REPLACE ENGINE ROOM MAIN WIRE 

8.CHECK INSTRUMENT PANEL WIRE (SHORT)


    C210535E12

  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
    AH4-1 (+SL) - AH4-2 (-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+)


    C210535E12

  1. Turn the power switch off.

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

    CAUTION:
    Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary 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 (-) auxiliary battery terminal.

  1. Turn the power switch on (IG).

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    AH4-1 (+SL) - Body ground
    		Power switch on (IG)
    		Below 1 V
    AH4-2 (-SL) - Body ground
    		Power switch on (IG)
    		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)


    C210535E12

  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
    AH4-1 (+SL) - Body ground
    		Always
    		1 MΩ or higher
    AH4-2 (-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