AIRBAG SYSTEM, Diagnostic DTC:B163B/86, B163C/86

DTC Code DTC Name
B163B/86 Side Airbag Sensor Assembly No.2 Lost Communication (LH)
B163C/86 Side Airbag Sensor Assembly No.2 Initialization Error (LH)

DESCRIPTION

The side collision sensor LH circuit (bus 2) consists of the airbag sensor assembly and floor side airbag sensor LH.

The floor side airbag sensor LH detects impacts to the vehicle and sends signals to the airbag sensor assembly to determine if the airbags and pretensioners should be deployed.

These DTCs are stored when a malfunction is detected in the side collision sensor LH circuit (bus 2).

DTC No. Detection Item DTC Detection Condition Trouble Area Test Mode / Check Mode
B163B/86 Side Airbag Sensor Assembly No.2 Lost Communication (LH)

Any of the following conditions is met:


  • The airbag sensor assembly detects a line short in the side collision sensor LH circuit (bus 2)

  • The airbag sensor assembly detects a short to ground in the side collision sensor LH circuit (bus 2).

  • The airbag sensor assembly detects a short to B+ in the side collision sensor LH circuit (bus 2).

  • The airbag sensor assembly detects an open in the side collision sensor LH circuit (bus 2).

  • Floor side airbag sensor LH malfunction

  • Airbag sensor assembly malfunction

  • Floor wire

  • Floor side airbag sensor LH

  • Airbag sensor assembly

 Does not apply to test/check mode
B163C/86 Side Airbag Sensor Assembly No.2 Initialization Error (LH)

Any of the following conditions is met:


  • The airbag sensor assembly detects a line short in the side collision sensor LH circuit (bus 2)

  • The airbag sensor assembly detects a short to ground in the side collision sensor LH circuit (bus 2).

  • The airbag sensor assembly detects a short to B+ in the side collision sensor LH circuit (bus 2).

  • The airbag sensor assembly detects an open in the side collision sensor LH circuit (bus 2).

  • Floor side airbag sensor LH malfunction

  • Airbag sensor assembly malfunction

  • Floor wire

  • Floor side airbag sensor LH

  • Airbag sensor assembly

 Does not apply to test/check mode
DTC Detection Conditions (B163B/86):
Vehicle Condition
Pattern 1 Pattern 2 Pattern 3 Pattern 4 Pattern 5 Pattern 6
Diagnosis Condition Ignition switch ON ○ ○ ○ ○ ○ ○
Malfunction Status The airbag sensor assembly detects a line short in the side collision sensor LH circuit (bus 2) ○ - - - - -
The airbag sensor assembly detects a short to ground in the side collision sensor LH circuit (bus 2) - ○ - - - -
The airbag sensor assembly detects a short to B+ in the side collision sensor LH circuit (bus 2) - - ○ - - -
The airbag sensor assembly detects an open in the side collision sensor LH circuit (bus 2) - - - ○ - -
Floor side airbag sensor LH malfunction - - - - ○ -
Airbag sensor assembly malfunction - - - - - ○
Detection Time - - - - - -
Number of Trips 1 trip 1 trip 1 trip 1 trip 1 trip 1 trip
DTC Detection Conditions (B163C/86):
Vehicle Condition
Pattern 1 Pattern 2 Pattern 3 Pattern 4 Pattern 5 Pattern 6
Diagnosis Condition Ignition switch ON ○ ○ ○ ○ ○ ○
Malfunction Status The airbag sensor assembly detects a line short in the side collision sensor LH circuit (bus 2) ○ - - - - -
The airbag sensor assembly detects a short to ground in the side collision sensor LH circuit (bus 2) - ○ - - - -
The airbag sensor assembly detects a short to B+ in the side collision sensor LH circuit (bus 2) - - ○ - - -
The airbag sensor assembly detects an open in the side collision sensor LH circuit (bus 2) - - - ○ - -
Floor side airbag sensor LH malfunction - - - - ○ -
Airbag sensor assembly malfunction - - - - - ○
Detection Time - - - - - -
Number of Trips 1 trip 1 trip 1 trip 1 trip 1 trip 1 trip

Tech Tips

DTC will be output when conditions for either of the patterns in the table above are met.

WIRING DIAGRAM

A001YEME31

CAUTION / NOTICE / HINT

Note

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

Click here

PROCEDURE


  1. CHECK CONNECTORS


    1. Turn the ignition switch off.

    2. Disconnect the cable from the negative (-) battery terminal.

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

    3. Check that the connectors are properly connected to the airbag sensor assembly and floor side airbag sensor LH.

      OK
      The connectors are properly connected.

      Tech Tips

      If the connectors are not properly connected, reconnect the connectors and proceed to the next inspection.

    4. Disconnect the connectors from the airbag sensor assembly and floor side airbag sensor LH.

    5. Check that the terminals of the connectors are not deformed or damaged.

      OK
      The terminals are not deformed or damaged.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FLOOR WIRE

    OK

  2. CHECK FLOOR WIRE (OPEN)


    1. Using a service wire, connect terminals 21 (BCL+) and 22 (BCL-) of connector B.

      A001S9PC02
      *A w/o Dual-stage SRS *B w/ Dual-stage SRS
      *1 Floor Side Airbag Sensor LH *2 Airbag Sensor Assembly
      *3 Floor Wire *4 Service Wire
      *a

      Front view of wire harness connector

      (to Airbag Sensor Assembly)

      		 *b

      Front view of wire harness connector

      (to Floor Side Airbag Sensor LH)

      Note

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      M35-2 (BFL+) - M35-1 (BFL-) Always Below 1 Ω

    3. Disconnect the service wire from connector B.

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FLOOR WIRE

    OK

  3. CHECK FLOOR WIRE (SHORT)


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

      A001YA1C01
      *A w/o Dual-stage SRS *B w/ Dual-stage SRS
      *1 Floor Side Airbag Sensor LH *2 Airbag Sensor Assembly
      *3 Floor Wire - -
      *a

      Front view of wire harness connector

      (to Floor Side Airbag Sensor LH)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      M35-2 (BFL+) - M35-1 (BFL-) Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FLOOR WIRE

    OK

  4. CHECK FLOOR WIRE (SHORT TO B+)


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

      A001YA1C01
      *A w/o Dual-stage SRS *B w/ Dual-stage SRS
      *1 Floor Side Airbag Sensor LH *2 Airbag Sensor Assembly
      *3 Floor Wire - -
      *a

      Front view of wire harness connector

      (to Floor Side Airbag Sensor LH)

      		 - -

    2. Turn the ignition switch ON.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      M35-2 (BFL+) - Body ground Ignition switch ON Below 1 V
      M35-1 (BFL-) - Body ground Ignition switch ON Below 1 V

    4. Turn the ignition switch off.

    5. Disconnect the cable from the negative (-) battery terminal.

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FLOOR WIRE

    OK

  5. CHECK FLOOR WIRE (SHORT TO GROUND)


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

      A001YA1C01
      *A w/o Dual-stage SRS *B w/ Dual-stage SRS
      *1 Floor Side Airbag Sensor LH *2 Airbag Sensor Assembly
      *3 Floor Wire - -
      *a

      Front view of wire harness connector

      (to Floor Side Airbag Sensor LH)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      M35-2 (BFL+) - Body ground Always 1 MΩ or higher
      M35-1 (BFL-) - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FLOOR WIRE

    OK

  6. CHECK FLOOR SIDE AIRBAG SENSOR LH


    1. A001WT3C02
      *A w/o Dual-stage SRS
      *B w/ Dual-stage SRS
      *1 Floor Side Airbag Sensor RH
      *2 Airbag Sensor Assembly

      Connect the connector to the airbag sensor assembly.

    2. Interchange the floor side airbag sensor LH with RH and connect the connectors.

    3. Connect the cable to the negative (-) battery terminal.

    4. Clear the DTCs stored in memory.

      Click here


      Body Electrical > SRS Airbag > Clear DTCs

    5. Turn the ignition switch off.

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

    7. Check for DTCs.

      Click here


      Body Electrical > SRS Airbag > Trouble Codes

      Tech Tips

      Codes other than DTCs B162B/85, B162C/85, B163B/86 and B163C/86 may be output at this time, but they are not related to this check.

      Result
      Result Proceed to
      DTC B163B/86 or B163C/86 is output. A
      DTC B162B/85 or B162C/85 is output. B
      DTCs B162B/85, B162C/85, B163B/86 and B163C/86 are not output. C

    8. Turn the ignition switch off.

    9. Disconnect the cable from the negative (-) battery terminal.

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

    10. Return the floor side airbag sensor LH and RH to their original positions and connect the connectors.


    A

    REPLACE AIRBAG SENSOR ASSEMBLY Click here

    B

    REPLACE FLOOR SIDE AIRBAG SENSOR LH Click here

    C

    USE SIMULATION METHOD TO CHECK Click here