PRE-COLLISION SYSTEM Pre-collision System Circuit

DESCRIPTION

This circuit provides power to operate the driving support ECU assembly.

WIRING DIAGRAM

A01HZQKE03

INSPECTION PROCEDURE

PROCEDURE


  1. CUSTOMER PROBLEM ANALYSIS AND SYMPTOM CHECK


    NEXT

  2. INSPECT BATTERY VOLTAGE


    1. Measure the battery voltage.

      Standard Voltage
      11 to 14 V

    2. Using the parts location and system diagram, check the system for blown-out fuses, open or short circuits in the wire harness(es) and connectors that are not properly connected by performing a visual check.

      Tech Tips

      If the voltage is 11 V or less, replace or recharge the battery before proceeding to the next step.


    NEXT

  3. CHECK DRIVING SUPPORT ECU ASSEMBLY


    1. A01HZEDE14
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Driving Support ECU Assembly)

      Check driving support ECU assembly.

      Note

      As the connector may be damaged if a load of more than 10 kg (22 lb) is applied to it, do not apply any more load than necessary to the connector.

    2. Disconnect the I187 driving support ECU assembly connector.

    3. Measure the resistance and voltage on the wire harness side connector according to the value(s) in the table below.

      Note

      DTCs may be output when connectors are disconnected during inspection. Therefore, make sure to clear the DTCs using the Techstream once the inspection has been completed.

      Tester Connection Condition Specified Condition
      I187-25 (GND) - Body ground Always Below 1 Ω
      I187-30 (B) - Body ground Engine switch on (IG) 11 to 14 V
      Engine switch off Below 1 V

    4. Reconnect the I187 driving support ECU assembly connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. INSPECT MILLIMETER WAVE RADAR SENSOR ASSEMBLY (BEAM AXIS MISALIGNMENT READING)

    Note

    Before checking the millimeter wave radar sensor assembly beam axis deviation, check the installation condition of the millimeter wave radar sensor assembly.


    1. Adjust the reflector height Click here.

    2. Place the reflector Click here.

    3. Connect the Techstream to the DLC3.

    4. Turn the Techstream on.

    5. Operate the pre-collision system cancel switch assembly to turn the pre-collision system on.

    6. Enter the following menus: Powertrain / Radar Cruise / Utility / Beam Axis Misalignment Reading.

    7. Check the amount of misalignment and make a note.

      Result
      Result Proceed to
      Beam axis is not misaligned A
      Beam axis is misaligned B

    B

    END (MILLIMETER WAVE RADAR SENSOR ASSEMBLY ADJUSTMENT)

    A

  5. CHECK CAN COMMUNICATION SYSTEM


    1. Use the Techstream to check if the CAN communication system is functioning normally Click here.

      OK
      CAN communication system DTCs are not output

    NG

    GO TO CAN COMMUNICATION SYSTEM Click here

    OK

  6. CHECK FOR DTCs (PRE-COLLISION 2)


    1. Check for DTCs and note any codes that are output.

    2. Clear the DTCs.

    3. Recheck for DTCs. Try to reproduce the DTCs by duplicating the conditions indicated by the DTCs.


    NG

    GO TO DIAGNOSTIC TROUBLE CODE CHART Click here

    OK

  7. CHECK DATA LIST / ACTIVE TEST


    1. Using the Techstream, check the Data List Click here.

    2. Using the Techstream, perform the Active Test Click here.


    NEXT

  8. CHECK VEHICLE CONTROL HISTORY


    1. Check whether the vehicle control history (PCS operation history) matches the customer analysis Click here.

      Result
      Result Proceed to
      Vehicle control history matches the customer analysis A
      Vehicle control history does not match customer analysis or there is no vehicle control history B

    B

    USE SIMULATION METHOD TO CHECK Click here

    A

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here