AIRBAG SYSTEM, Diagnostic DTC:B16A7/97, B16A8/97

DTC Code DTC Name
B16A7/97 Lost Communication with Pedestrian Detection Sensor Bus LH
B16A8/97 Pedestrian Detection Sensor Bus LH Initialization Incomplete

DESCRIPTION

The pedestrian detection sensor LH circuit consists of the airbag ECU assembly and pedestrian protection sensor LH.

The pedestrian protection sensor LH detects impacts to the vehicle and sends signals to the airbag ECU assembly to determine if the pop up hood lifter should be deployed.

These DTCs are stored when a malfunction is detected in the pedestrian detection sensor LH circuit.

DTC No. Detection Item DTC Detection Condition Trouble Area Test Mode / Check Mode
B16A7/97 Lost Communication with Pedestrian Detection Sensor Bus LH

  • The airbag ECU assembly detects a line short, short to ground or B+, or an open in the pedestrian detection sensor LH circuit.

  • Pedestrian protection sensor LH malfunction

  • Airbag ECU assembly malfunction

  • No. 2 floor wire

  • Engine room main wire

  • Pedestrian protection sensor LH

  • Airbag ECU assembly

 Does not apply to test/check mode
B16A8/97 Pedestrian Detection Sensor Bus LH Initialization Incomplete

  • The airbag ECU assembly detects a line short, short to ground or B+, or an open in the pedestrian detection sensor LH circuit.

  • Pedestrian protection sensor LH malfunction

  • Airbag ECU assembly malfunction

  • No. 2 floor wire

  • Engine room main wire

  • Pedestrian protection sensor LH

  • Airbag ECU assembly

 Does not apply to test/check mode

WIRING DIAGRAM

B004GP3E52
*a PSL+
*b PSL-
*c Pedestrian Protection Sensor LH
*d Airbag ECU Assembly

CAUTION / NOTICE / HINT

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

PROCEDURE


  1. CHECK CONNECTORS


    1. Turn the power switch off.

    2. 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.

    3. Check that the connectors are properly connected to the airbag ECU assembly and pedestrian protection sensor LH. Also check that the connectors that link the engine room main wire and No. 2 floor wire are properly connected.

      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 ECU assembly and pedestrian protection sensor LH. Also disconnect the connectors that link the engine room main wire and No. 2 floor wire.

    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 WIRE HARNESS

    OK

  2. CHECK WIRE HARNESS (OPEN)


    1. B004G3AC02
      *1 Pedestrian Protection Sensor LH
      *2 Airbag ECU Assembly
      *3 Service Wire
      *a

      Front view of wire harness connector

      (to Airbag ECU Assembly)
      *b

      Front view of wire harness connector

      (to Pedestrian Protection Sensor LH)

      Connect the connectors that link the engine room main wire and No. 2 floor wire.

    2. Using a service wire, connect terminals 20 (PSL+) and 19 (PSL-) of connector B.

      Note

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A40-2 (PSL+) - A40-1 (PSL-) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    CHECK NO. 2 FLOOR WIRE (OPEN) Click here

    OK

  3. CHECK WIRE HARNESS (SHORT)


    1. B004G1GC03
      *1 Pedestrian Protection Sensor LH
      *2 Airbag ECU Assembly
      *a

      Front view of wire harness connector

      (to Pedestrian Protection Sensor LH)

      Disconnect the service wire from connector B.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A40-2 (PSL+) - A40-1 (PSL-) Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    CHECK NO. 2 FLOOR WIRE (SHORT) Click here

    OK

  4. CHECK WIRE HARNESS (SHORT TO B+)


    1. B004G1GC03
      *1 Pedestrian Protection Sensor LH
      *2 Airbag ECU Assembly
      *a

      Front view of wire harness connector

      (to Pedestrian Protection Sensor LH)

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

    2. Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A40-2 (PSL+) - Body ground Power switch on (IG) Below 1 V
      A40-1 (PSL-) - Body ground Power switch on (IG) Below 1 V

    4. Turn the power switch off.

    5. 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.

      Result
      Proceed to
      OK
      NG

    NG

    CHECK NO. 2 FLOOR WIRE (SHORT TO B+) Click here

    OK

  5. CHECK WIRE HARNESS (SHORT TO GROUND)


    1. B004G1GC03
      *1 Pedestrian Protection Sensor LH
      *2 Airbag ECU Assembly
      *a

      Front view of wire harness connector

      (to Pedestrian Protection Sensor LH)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A40-2 (PSL+) - Body ground Always 1 MΩ or higher
      A40-1 (PSL-) - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    CHECK NO. 2 FLOOR WIRE (SHORT TO GROUND) Click here

    OK

  6. CHECK PEDESTRIAN PROTECTION SENSOR LH


    1. B004G8QC02
      *1 Pedestrian Protection Sensor RH
      *2 Airbag ECU Assembly

      Connect the connector to the airbag ECU assembly.

    2. Interchange the pedestrian protection sensor LH with RH and connect the connectors.

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

    4. Clear the DTCs stored in memory.

      Click here


      Body Electrical > SRS Airbag > Clear DTCs

    5. Turn the power switch off.

    6. Turn the power switch on (IG), 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 B16A2/87, B16A3/87, B16A7/97 and B16A8/97 may be output at this time, but they are not related to this check.

      Result
      Result Proceed to
      DTCs B16A2/87, B16A3/87, B16A7/97 and B16A8/97 are not output. A
      DTC B16A2/87 or B16A3/87 is output. B
      DTC B16A7/97 or B16A8/97 is output. C

    8. Turn the power switch off.

    9. 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.

    10. Return the pedestrian protection sensor LH and RH to their original positions and connect the connectors.


    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE PEDESTRIAN PROTECTION SENSOR LH Click here

    C

    REPLACE AIRBAG ECU ASSEMBLY Click here

  7. CHECK NO. 2 FLOOR WIRE (SHORT TO GROUND)


    1. B004FFRC04
      *1 Pedestrian Protection Sensor LH
      *2 Airbag ECU Assembly
      *3 Engine Room Main Wire
      *4 No. 2 Floor Wire
      *a

      Front view of wire harness connector

      (to Engine Room Main Wire)

      Disconnect the No. 2 floor wire connector from the engine room main wire.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      AU4-1 (PSL+) - Body ground Always 1 MΩ or higher
      AU4-4 (PSL-) - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ENGINE ROOM MAIN WIRE

    NG

    REPLACE NO. 2 FLOOR WIRE

  8. CHECK NO. 2 FLOOR WIRE (SHORT TO B+)


    1. B004FFRC04
      *1 Pedestrian Protection Sensor LH
      *2 Airbag ECU Assembly
      *3 Engine Room Main Wire
      *4 No. 2 Floor Wire
      *a

      Front view of wire harness connector

      (to Engine Room Main Wire)

      Disconnect the No. 2 floor wire connector from the engine room main wire.

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

    3. Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      AU4-1 (PSL+) - Body ground Power switch on (IG) Below 1 V
      AU4-4 (PSL-) - Body ground Power switch on (IG) Below 1 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ENGINE ROOM MAIN WIRE

    NG

    REPLACE NO. 2 FLOOR WIRE

  9. CHECK NO. 2 FLOOR WIRE (SHORT)


    1. B004FFRC04
      *1 Pedestrian Protection Sensor LH
      *2 Airbag ECU Assembly
      *3 Engine Room Main Wire
      *4 No. 2 Floor Wire
      *a

      Front view of wire harness connector

      (to Engine Room Main Wire)

      Disconnect the No. 2 floor wire connector from the engine room main wire.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      AU4-1 (PSL+) - AU4-4 (PSL-) Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ENGINE ROOM MAIN WIRE

    NG

    REPLACE NO. 2 FLOOR WIRE

  10. CHECK NO. 2 FLOOR WIRE (OPEN)


    1. B004FKYC02
      *1 Pedestrian Protection Sensor LH
      *2 Airbag ECU Assembly
      *3 Engine Room Main Wire
      *4 No. 2 Floor Wire
      *5 Service Wire
      *a

      Front view of wire harness connector

      (to Airbag ECU Assembly)
      *b

      Front view of wire harness connector

      (to Engine Room Main Wire)

      Disconnect the No. 2 floor wire connector from the engine room main wire.

      Tech Tips

      The service wire has already been inserted into connector B.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      AU4-1 (PSL+) - AU4-4 (PSL-) Always Below 1 Ω

    3. Disconnect the service wire from connector B.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ENGINE ROOM MAIN WIRE

    NG

    REPLACE NO. 2 FLOOR WIRE