PRE-CRASH SAFETY SYSTEM Pre-crash Safety System Switch Circuit

DESCRIPTION

Each time the pre-crash safety system switch in the No. 2 combination switch assembly is pressed, the multi-information display sensitivity setting display changes to switch the sensitivity of the pre-crash safety system between 3 levels. Also, when the switch is pressed and held, the pre-crash safety system cancels.

WIRING DIAGRAM

A01HFW6E05
*a No. 2 Combination Switch Assembly (Pre-crash Safety System Switch)
*b Driving Support ECU Assembly

CAUTION / NOTICE / HINT

Note

When replacing the driving support ECU assembly, always replace it with a new one. If a driving support ECU assembly which was installed to another vehicle is used, the information stored in the driving support ECU assembly will not match the information from the vehicle. As a result, a DTC may be stored.

PROCEDURE


  1. READ VALUE USING GTS (PCS OFF SWITCH)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

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

    5. Read the Data List according to the display on the GTS.


      Body Electrical > Pre-Crash 2 > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      PCS OFF Switch Pre-crash safety system switch status ON or OFF

      ON: Pre-crash safety system function disabled due to switch operation

      OFF: Pre-crash safety system function enabled due to switch operation

      		 -

      Body Electrical > Pre-Crash 2 > Data List
      Tester Display
      PCS OFF Switch
      OK
      When the pre-crash safety system switch is operated, the display changes as shown above.
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

  2. INSPECT NO. 2 COMBINATION SWITCH ASSEMBLY (PRE-CRASH SAFETY SYSTEM SWITCH)


    1. Remove the No. 2 combination switch assembly (pre-crash safety system switch).

      Click here

    2. Inspect the No. 2 combination switch assembly (pre-crash safety system switch).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE NO. 2 COMBINATION SWITCH ASSEMBLY (PRE-CRASH SAFETY SYSTEM SWITCH) Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (NO. 2 COMBINATION SWITCH ASSEMBLY [PRE-CRASH SAFETY SYSTEM SWITCH] - DRIVING SUPPORT ECU ASSEMBLY AND BODY GROUND)


    1. Disconnect the I37 No. 2 combination switch assembly (pre-crash safety system switch) connector.

    2. Disconnect the I19 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
      I37-4 (ECU) - I19-5 (PBSW) Always Below 1 Ω
      I37-4 (ECU) - Body ground Always 10 kΩ or higher
      I37-16 (GND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE DRIVING SUPPORT ECU ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR