AIRBAG SYSTEM, Diagnostic DTC:B1617, B1618

DTC Code DTC Name
B1617 Lost Communication with Front Airbag Sensor LH
B1618 Front Airbag Sensor LH Initialization Incomplete

DESCRIPTION

The No. 2 airbag sensor assembly circuit consists of the airbag ECU assembly and No. 2 airbag sensor assembly.

The No. 2 airbag sensor assembly detects impacts to the vehicle and sends signals to the airbag ECU assembly to determine if the airbag should be deployed.

DTC B1617 or B1618 is stored when a malfunction is detected in the No. 2 airbag sensor assembly circuit.

DTC Code DTC Detection Condition Trouble Area

B1617

B1618

One of the following conditions is met:


  • The airbag ECU assembly detects a line short circuit signal, open circuit signal, short circuit to ground signal or short circuit to B+ signal in the No. 2 airbag sensor assembly circuit for 2 seconds.

  • A No. 2 airbag sensor assembly malfunction.

  • An airbag ECU assembly malfunction.

  • Instrument panel wire

  • Cowl wire

  • No. 2 airbag sensor assembly

  • Airbag ECU assembly

WIRING DIAGRAM

A01CIY2E12

INSPECTION PROCEDURE

Note


  • After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notices before proceeding with work Click here.

  • When disconnecting the cable from the negative (-) battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected Click here.

PROCEDURE


  1. CHECK CONNECTION OF CONNECTORS


    1. Turn the ignition switch off.

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

    3. Check that the connectors are properly connected to the airbag ECU assembly and No. 2 airbag sensor assembly.

      OK
      The connectors are properly connected.

    NG

    CONNECT CONNECTORS PROPERLY

    OK

  2. CHECK CONNECTORS


    1. A01CHCJE01
      Text in Illustration
      *1 No. 2 Airbag Sensor Assembly
      *2 Airbag ECU Assembly

      Disconnect the connectors from the airbag ECU assembly and No. 2 airbag sensor assembly.

    2. Check that the connectors (on the airbag ECU assembly side and No. 2 airbag sensor assembly side) are not damaged.

      OK
      The connectors are not deformed or damaged.

    NG

    REPLACE HARNESS AND CONNECTOR

    OK

  3. CHECK NO. 2 AIRBAG SENSOR ASSEMBLY CIRCUIT


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

      A01CITSE02
      Text in Illustration
      *1 No. 2 Airbag Sensor Assembly *2 Airbag ECU Assembly
      *3 Connector E *4 Connector B
      *5 Service Wire - -
      *a

      Front view of wire harness connector

      (to No. 2 Airbag Sensor Assembly)

      		 *b

      Rear view of wire harness connector

      (to Airbag ECU Assembly)

    2. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      N5-2 (+SR) - Body ground Ignition switch ON Below 1 V
      N5-1 (-SR) - Body ground Ignition switch ON Below 1 V

    4. Turn the ignition switch off.

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

    6. Using a service wire, connect terminals 12 (+SR) and 13 (-SR) of connector B.

      Note

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N5-2 (+SR) - N5-1 (-SR) Always Below 1 Ω

    8. Disconnect the service wire from connector B.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N5-2 (+SR) - N5-1 (-SR) Always 1 MΩ or higher
      N5-2 (+SR) - Body ground Always 1 MΩ or higher
      N5-1 (-SR) - Body ground Always 1 MΩ or higher

    NG

    CHECK INSTRUMENT PANEL WIRE Click here

    OK

  4. CHECK NO. 2 AIRBAG SENSOR ASSEMBLY


    1. A01CHE8E01
      Text in Illustration
      *1 No. 2 Airbag Sensor Assembly
      *2 Airbag ECU Assembly

      Connect the connector to the airbag ECU assembly.

    2. Temporarily replace the No. 2 airbag sensor assembly with a new one Click here.

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

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

    5. Clear the DTCs stored in memory Click here.

    6. Turn the ignition switch off.

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

    8. Check for DTCs Click here.

      OK
      DTC B1617 and B1618 are not output.

      Tech Tips

      Codes other than DTCs B1617 and B1618 may be output at this time, but they are not related to this check.


    NG

    REPLACE AIRBAG ECU ASSEMBLY Click here

    OK

    END (NO. 2 AIRBAG SENSOR ASSEMBLY WAS DEFECTIVE)

  5. CHECK INSTRUMENT PANEL WIRE


    1. Disconnect the instrument panel wire connector from the cowl wire.

      A01CGXDE02
      Text in Illustration
      *1 No. 2 Airbag Sensor Assembly *2 Cowl Wire
      *3 Instrument Panel Wire *4 Airbag ECU Assembly
      *5 Connector C *6 Connector B
      *7 Service Wire - -
      *a

      Front view of wire harness connector

      (to Cowl Wire)

      		 *b

      Rear view of wire harness connector

      (to Airbag ECU Assembly)

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

    3. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      IN2-2 (+SR) - Body ground Ignition switch ON Below 1 V
      IN2-1 (-SR) - Body ground Ignition switch ON Below 1 V

    5. Turn the ignition switch off.

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

    7. Using a service wire, connect terminals 12 (+SR) and 13 (-SR) of connector B.

      Note

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      IN2-2 (+SR) - IN2-1 (-SR) Always Below 1 Ω

    9. Disconnect the service wire from connector B.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      IN2-2 (+SR) - IN2-1 (-SR) Always 1 MΩ or higher
      IN2-2 (+SR) - Body ground Always 1 MΩ or higher
      IN2-1 (-SR) - Body ground Always 1 MΩ or higher

    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

    REPLACE COWL WIRE