PRE-CRASH SAFETY SYSTEM Pre-crash Safety Brake Cancel Switch Circuit

DESCRIPTION

The driving support ECU assembly receives a pre-crash brake on/off signal from the pre-crash system cancel switch assembly.

WIRING DIAGRAM

A00403BE01

INSPECTION PROCEDURE

PROCEDURE


  1. READ VALUE USING GTS (PRE-CRASH BRAKE OFF SWITCH)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Pre-Crash 2 / Data List / Pre-Crash Brake OFF Switch.

    5. Read the display on the GTS.

      Pre-Crash 2
      GTS Display Measurement Item/Range Normal Condition Diagnostic Note
      Pre-Crash Brake OFF Switch

      Pre-crash system cancel switch assembly signal/

      ON or OFF

      ON: Pre-crash system cancel switch assembly on

      OFF: Pre-crash system cancel switch assembly off

      		 -
      OK
      On screen, each item changes between ON and OFF according to above chart.

    NG

    INSPECT PRE-CRASH SYSTEM CANCEL SWITCH ASSEMBLY Click here

    OK

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

  2. INSPECT PRE-CRASH SYSTEM CANCEL SWITCH ASSEMBLY


    1. Inspect the pre-crash system cancel switch assembly Click here.


    NG

    REPLACE PRE-CRASH SYSTEM CANCEL SWITCH ASSEMBLY Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (PRE-CRASH SYSTEM CANCEL SWITCH ASSEMBLY - DRIVING SUPPORT ECU ASSEMBLY)


    1. Disconnect the L53 pre-crash system cancel switch assembly connector.

    2. Disconnect the L54 driving support ECU assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L53-1 - L54-5 (PBSW) Always Below 1 Ω
      L53-1 or L54-5 (PBSW) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (PRE-CRASH SYSTEM CANCEL SWITCH ASSEMBLY - BODY GROUND)


    1. Disconnect the L53 pre-crash system cancel switch assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L53-2 - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE DRIVING SUPPORT ECU ASSEMBLY Click here