AIRBAG SYSTEM, Diagnostic DTC:B1608/84, B1617/84

DTC Code DTC Name
B1608/84 Front Satellite Sensor Bus LH Initialization Incomplete
B1617/84 Lost Communication with Front Airbag Sensor LH

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 B1608/84 or B1617/84 is recorded when a malfunction is detected in the front airbag sensor LH circuit.

DTC Code Detection Condition Trouble Area
B1608/84

One of the following conditions is met:


  • 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.

  • Front airbag sensor LH malfunction

  • Center airbag sensor assembly malfunction

  • Instrument panel wire

  • Engine room main wire

  • Front airbag sensor LH

  • Center airbag sensor assembly
B1617/84

One of the following conditions is met:


  • 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.

  • Front airbag sensor LH malfunction

  • Center airbag sensor assembly malfunction

  • Instrument panel wire

  • Engine room main wire

  • Front airbag sensor LH

  • Center airbag sensor assembly

WIRING DIAGRAM

A01GWQ4E17

INSPECTION PROCEDURE

Note


  • 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.

  • When disconnecting the cable from the negative (-) auxiliary 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 power switch OFF.

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

    3. 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.

    2. 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

    A01H1PJE08

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

    2. Turn the power switch ON (IG).

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      A8-2 (+SL) - Body ground Power switch ON (IG) Below 1 V
      A8-1 (-SL) - Body ground Power switch ON (IG) Below 1 V

    4. Turn the power switch OFF.

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

    6. Using a service wire, connect terminals 30 (+SL) and 28 (-SL) 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
      A8-2 (+SL) - A8-1 (-SL) 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
      A8-2 (+SL) - A8-1 (-SL) Always 1 MΩ or higher
      A8-2 (+SL) - Body ground Always 1 MΩ or higher
      A8-1 (-SL) - Body ground Always 1 MΩ or higher

    NG

    CHECK INSTRUMENT PANEL WIRE Click here

    OK

  4. CHECK FRONT AIRBAG SENSOR LH

    A01GW9TE38

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

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

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

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

    5. Clear the DTCs stored in the memory Click here.

    6. Turn the power switch OFF.

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

    8. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC B1608 or B1617 is output A
      DTC B1603 or B1612 is output B
      DTC B1603, B1608, B1612 and B1617 are not output C

      Tech Tips

      Codes other than DTC B1603, B1608, B1612 and B1617may 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

    A01GY4PE07

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

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

    3. Turn the power switch ON (IG).

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      LA2-1 (+SL) - Body ground Power switch ON (IG) Below 1 V
      LA2-2 (-SL) - Body ground Power switch ON (IG) Below 1 V

    5. Turn the power switch OFF.

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

    7. Using a service wire, connect terminals 30 (+SL) and 28 (-SL) 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
      LA2-1 (+SL) - LA2-2 (-SL) 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
      LA2-1 (+SL) - LA2-2 (-SL) Always 1 MΩ or higher
      LA2-1 (+SL) - Body ground Always 1 MΩ or higher
      LA2-2 (-SL) - Body ground Always 1 MΩ or higher

    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

    REPLACE ENGINE ROOM MAIN WIRE