PEDESTRIAN PROTECTION SYSTEM, Diagnostic DTC:B16A7, B16A8

DTC Code DTC Name
B16A7 Lost Communication with Pedestrian Protection Sensor Bus LH
B16A8 Pedestrian Protection Sensor Bus Initialization Incomplete (LH)

DESCRIPTION

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

The pedestrian protection sensor LH detects impacts to the vehicle and sends signals to the pedestrian detection ECU assembly to determine if the pop up hood 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 Warning Indicate Test Mode / Check Mode
B16A7 Lost Communication with Pedestrian Protection Sensor Bus LH

One of the following conditions is met:


  • The pedestrian detection ECU assembly detects a line short circuit signal, open circuit signal, short circuit to ground signal or short circuit to B+ signal in the circuit for the pedestrian detection sensor LH for 2 seconds.

  • A pedestrian detection sensor LH malfunction.

  • A pedestrian detection ECU assembly malfunction.


  • Instrument panel wire

  • Engine room main wire

  • Pedestrian detection chamber assembly (pedestrian protection sensor LH)

  • pedestrian detection ECU assembly

Comes on Not applicable
B16A8 Pedestrian Protection Sensor Bus Initialization Incomplete (LH)

One of the following conditions is met:


  • The pedestrian detection ECU assembly detects a line short circuit signal, open circuit signal, short circuit to ground signal or short circuit to B+ signal in the circuit for the pedestrian detection sensor LH for 2 seconds.

  • A pedestrian detection sensor LH malfunction.

  • A pedestrian detection ECU assembly malfunction.


  • Instrument panel wire

  • Engine room main wire

  • Pedestrian detection chamber assembly (pedestrian protection sensor LH)

  • Pedestrian detection ECU assembly

Comes on Not applicable

WIRING DIAGRAM

B004CBFE09
*a PSL+
*b PSL-
*c Pedestrian Detection Chamber Assembly (Pedestrian Protection Sensor LH)
*d Pedestrian Detection 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

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

    3. Check that the connectors are properly connected to the pedestrian detection ECU assembly and pedestrian detection chamber assembly (pedestrian detection sensor LH).

      OK
      The connectors are properly connected.
      Result
      Proceed to
      OK
      NG

    NG
    OK
  2. CHECK CONNECTORS


    1. B004CO4C01
      *1 Pedestrian Detection Chamber Assembly (Pedestrian Protection Sensor LH)
      *2 Pedestrian Detection ECU Assembly
      *3 Engine Room Main Wire
      *4 Instrument Panel Wire

      Disconnect the connectors from the pedestrian detection ECU assembly and pedestrian detection chamber assembly (pedestrian protection sensor LH).

    2. Check that the connectors (on the pedestrian detection ECU assembly side and pedestrian detection sensor LH side) are not damaged.

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

    NG
    OK
  3. CHECK PEDESTRIAN PROTECTION SENSOR LH CIRCUIT


    1. B004BO9C01
      *1 Pedestrian Protection Sensor LH
      *2 Pedestrian Detection ECU Assembly
      *3 Engine Room Main Wire
      *4 Instrument Panel Wire
      *5 Service Wire
      *a

      Front view of wire harness connector

      (to Pedestrian Protection Sensor LH)

      *b

      Rear view of wire harness connector

      (to Pedestrian Detection ECU Assembly)

      Connect the cable to the negative (-) auxiliary battery terminal, 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
      A31-2 (PSL+) - Body ground Power switch on (IG) Below 1 V
      A31-1 (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, and wait for at least 90 seconds.

    6. Using a service wire, connect terminals 12 (PSL+) and 11 (PSL-) 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
      A31-2 (PSL+) - A31-1 (PSL-) 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
      A31-2 (PSL+) - A31-1 (PSL-) Always 1 MΩ or higher
      A31-2 (PSL+) - Body ground Always 1 MΩ or higher
      A31-1 (PSL-) - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    NG
    OK
  4. CHECK PEDESTRIAN PROTECTION SENSOR LH


    1. B004AU1C01
      *1 Pedestrian Detection Chamber Assembly (Pedestrian Protection Sensor LH)
      *2 Pedestrian Detection ECU Assembly

      Connect the connectors to the pedestrian detection ECU assembly.

    2. Replace the pedestrian detection chamber assembly with a new one.

      Click here

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

      Click here


      Body Electrical > Pedestrian Protection > Clear DTCs
    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


      Body Electrical > Pedestrian Protection > Trouble Codes
      Result
      Result Proceed to
      DTCs B16A7 and B16A8 are not output A
      DTC B16A2 or B16A3 is output B

      Tech Tips

      Codes other than B16A2, B16A3, B16A7 and B16A8 may be output at this time, but they are not related to this check.

    9. Turn the power switch off.

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

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


    A
    B
  5. CHECK INSTRUMENT PANEL WIRE


    1. B004AORC01
      *1 Pedestrian Detection Chamber Assembly (Pedestrian Protection Sensor LH)
      *2 Pedestrian Detection ECU Assembly
      *3 Engine Room Main Wire
      *4 Instrument Panel Wire
      *5 Service Wire
      *a

      Front view of wire harness connector

      (to Engine Room Main Wire)

      *b

      Rear view of wire harness connector

      (to Pedestrian Detection ECU Assembly)

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

    2. Connect the cable to the negative (-) auxiliary battery terminal, 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
      PA2-1 (PSL+) - Body ground Power switch on (IG) Below 1 V
      PA2-2 (PSL-) - Body ground Power switch on (IG) Below 1 V
    5. Turn the power switch off.

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

    7. Using a service wire, connect terminals 12 (PSL+) and 11 (PSL-) 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
      PA2-1 (PSL+) - PA2-2 (PSL-) 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
      PA2-1 (PSL+) - PA2-2 (PSL-) Always 1 MΩ or higher
      PA2-1 (PSL+) - Body ground Always 1 MΩ or higher
      PA2-2 (PSL-) - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    OK
    NG