PRE-COLLISION SYSTEM Pre-collision System Circuit

DESCRIPTION

When the ignition switch ON, power is supplied to the pre-collision city sensor.

WIRING DIAGRAM

A002LSVE01
*1 from IG Circuit
*2 ECU-IG NO. 3
*3 Pre-collision City Sensor

CAUTION / NOTICE / HINT

Note

Inspect the fuses for circuits related to this system before performing the following procedure.

Tech Tips

Communication may be suspended if the temperature of the pre-collision city sensor is abnormal. In this case, DTC U023A will be stored, however when the temperature returns to normal, communication will return.

PROCEDURE


  1. INSPECT BATTERY VOLTAGE


    1. Measure the battery voltage with the ignition switch off.

      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

  2. CHECK PRE-COLLISION CITY SENSOR


    1. Check pre-collision city sensor.

      Note

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


      1. A002OA7E02
        Text in Illustration
        *a

        Front view of wire harness connector

        (to Pre-collision City Sensor)

        Disconnect the Q12 pre-collision city sensor connector.

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

        Standard Voltage
        Tester Connection Condition Specified Condition
        Q12-7 (IG1) - Body ground Ignition switch ON 11 to 14 V
        Q12-7 (IG1) - Body ground Ignition switch off Below 1 V

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        Q12-10 (GND) - Body ground Always Below 1 Ω

      4. Connect the Q12 pre-collision city sensor connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK CAN COMMUNICATION SYSTEM


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

      Result
      Result Proceed to
      CAN communication system DTCs are not output A
      CAN communication system DTCs are output B

    A

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

    B

    GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here