LANE DEPARTURE ALERT SYSTEM(w/ Steering Control) Steering Pad Switch Circuit

DESCRIPTION

The driving support ECU assembly receives a lane departure alert switch signal from the steering pad switch assembly and sends the signal to the forward recognition camera via CAN communication.

WIRING DIAGRAM

B004PUWE17

CAUTION / NOTICE / HINT

Note

The vehicle is equipped with a Supplemental Restraint System (SRS) which includes components such as airbags. Before servicing (including removal or installation of parts), be sure to read the precaution for Supplemental Restraint System.

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PROCEDURE


  1. READ VALUE USING GTS (CAN BUS CHECK)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: System Select / Can Bus Check.


      CAN Bus Check
      Result
      Result Proceed to
      All of the ECUs and sensors that are currently connected to the CAN communication system are displayed A
      None of the ECUs and sensors that are currently connected to the CAN communication system are displayed, or some of them are not displayed B

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  2. CHECK FOR DTCs (HEALTH CHECK)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: System Select / Health Check.

    5. Check DTCs.

    6. Turn the power switch off.

      Result
      Result Proceed to
      No DTCs are output. A
      DTCs are output. B

    B

    GO TO DTC CHART

    A

  3. INSPECT STEERING PAD SWITCH ASSEMBLY


    1. Remove the horn button assembly.

      Click here

    2. Disconnect the z3 steering pad switch assembly connector.

      B004PMRC03
      *a

      Front view of wire harness connector

      (Steering Pad Switch Assembly)

      		 *b Lane Departure Alert Main Switch

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      z3-4 (DIST) - z3-7 (ECC) Lane departure alert main switch pushed and held 228 to 252 Ω
      Lane departure alert main switch not pushed 10 kΩ or higher

    4. Reconnect the z3 steering pad switch assembly connector.

    5. Reinstall the horn button assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE STEERING PAD SWITCH ASSEMBLY Click here

    OK

  4. INSPECT SPIRAL CABLE SUB-ASSEMBLY


    1. Inspect the spiral cable sub-assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE SPIRAL CABLE SUB-ASSEMBLY Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - DRIVING SUPPORT ECU ASSEMBLY)


    1. Disconnect the F21 spiral cable sub-assembly connector.

    2. Disconnect the F40 driving support ECU assembly connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      F21-12 (DIST) - F40-23 (SPSW) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      F21-12 (DIST) or F40-23 (SPSW) - Body ground Always 10 kΩ or higher

    4. Connect the F40 driving support ECU assembly connector.

    5. Connect the F21 spiral cable sub-assembly connector.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - BODY GROUND)


    1. Disconnect the F21 spiral cable sub-assembly connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      F21-2 (ECC) - Body ground Always Below 1 Ω

    3. Reconnect the F21 spiral cable sub-assembly connector.

      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR