LANE DEPARTURE ALERT SYSTEM(w/ Steering Control), Diagnostic DTC:C1A75

DTC Code DTC Name
C1A75 Lost Communication with Steering Vibrator System

DESCRIPTION

The forward recognition camera communicates with the steering vibration ECU via LIN communication.

If a communication error between the forward recognition camera and steering vibration ECU is detected, DTC C1A75 is stored.

DTC No. Detection Item DTC Detection Condition Trouble Area
C1A75 Lost Communication with Steering Vibrator System

When all of the following conditions are met:


  • The vehicle speed is 5 km/h (4 mph) or more.

  • The lane departure alert system is on.

  • A LIN communication error between the forward recognition camera and steering vibration ECU (steering wheel assembly) is detected for 5 minutes or more.

  • Forward recognition camera

  • Steering vibration ECU (Steering wheel assembly)

  • Spiral cable sub-assembly

  • Wire harness or connector

WIRING DIAGRAM

A001J0FE03

CAUTION / NOTICE / HINT

Note


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

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

  • If the forward recognition camera has been replaced with a new one, be sure to perform forward recognition camera adjustment.

    Click here

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (FORWARD RECOGNITION CAMERA - STEERING VIBRATION ECU)


    1. Turn the engine switch off.

    2. Disconnect the S18 forward recognition camera connector.

    3. Disconnect the z15 spiral cable sub-assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      z15-2 (LDA) (spiral cable sub-assembly side) - S18-2 (STRV) Always Below 1 Ω
      z15-2 (LDA) (spiral cable sub-assembly side) or S18-2 (STRV) - Body ground Engine switch off 10 kΩ or higher

    5. Connect the S18 forward recognition camera connector.

    6. Connect the z15 spiral cable sub-assembly connector.

      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - FORWARD RECOGNITION CAMERA) Click here

    OK

  2. INSPECT STEERING VIBRATION ECU (IG VOLTAGE)


    1. Disconnect the z18 spiral cable sub-assembly connector.

    2. Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      z18-4 (BHT) (spiral cable sub-assembly side) - Body ground Engine switch on (IG) 11 to 14 V

    4. Turn the engine switch off.

    5. Connect the z18 spiral cable sub-assembly connector.

      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (STEERING VIBRATION ECU POWER SOURCE CIRCUIT) Click here

    OK

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


    1. Disconnect the z18 spiral cable sub-assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      z18-1 (EHT) (spiral cable sub-assembly side) - Body ground Always Below 1 Ω

    3. Connect the z18 spiral cable sub-assembly connector.

      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - BODY GROUND) Click here

    OK

  4. INSPECT NO. 1 SWITCH WIRE


    1. A001JRFC04
      *a

      No. 1 Switch Wire Connector

      (to Spiral Cable Sub-assembly)
      *b

      No. 1 Switch Wire Connector

      (to Steering Vibration ECU (Steering Wheel Assembly))

      Disconnect the z15 No. 1 switch wire connector from the spiral cable sub-assembly.

    2. Disconnect the A No. 1 switch wire connector from the steering vibration ECU (steering wheel assembly).

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      z15-2 (LDA) - A-2 (LDA) Always Below 1 Ω
      z15-2 (LDA) or A-2 (LDA) - Body ground Always 1 kΩ or higher

    4. Connect the A No. 1 switch wire connector to the steering vibration ECU (steering wheel assembly).

    5. Connect the z15 No. 1 switch wire connector to the spiral cable sub-assembly.

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE NO. 1 SWITCH WIRE Click here

    OK

  5. REPLACE STEERING VIBRATION ECU (STEERING WHEEL ASSEMBLY)


    1. Replace the steering vibration ECU (steering wheel assembly).

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  6. CHECK FOR DTCs (LANE DEPARTURE ALERT SYSTEM)


    1. Clear the DTCs.

      Click here


      Chassis > LKA/LDA > Clear DTCs

    2. Perform the following procedure.

      Tech Tips

      If the following procedure is not performed, the previously output DTC cannot be detected.


      1. Turn the engine switch on (IG).

      2. Turn the lane departure alert system ON.

      3. Drive the vehicle at a speed of 5 km/h (4 mph) or more for 5 minutes or more.

    3. Check for DTCs.

      Click here


      Chassis > LKA/LDA > Trouble Codes
      Result
      Result Proceed to
      DTC C1A75 is not output A
      DTC C1A75 is output B

    A

    END (STEERING VIBRATION ECU WAS DEFECTIVE)

    B

    REPLACE FORWARD RECOGNITION CAMERA Click here

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


    1. Disconnect the K140 spiral cable sub-assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K140-2 (EHT) (connector side) - Body ground Always Below 1 Ω

    3. Connect the K140 spiral cable sub-assembly connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE SPIRAL CABLE SUB-ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - BODY GROUND)

  8. CHECK HARNESS AND CONNECTOR (STEERING VIBRATION ECU POWER SOURCE CIRCUIT)


    1. Disconnect the K140 spiral cable sub-assembly connector.

    2. Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      K140-4 (BHT) (connector side) - Body ground Engine switch on (IG) 11 to 14 V

    4. Turn the engine switch off.

    5. Connect the K140 spiral cable sub-assembly connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE SPIRAL CABLE SUB-ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (STEERING VIBRATION ECU POWER SOURCE CIRCUIT)

  9. CHECK HARNESS AND CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - FORWARD RECOGNITION CAMERA)


    1. Disconnect the S18 forward recognition camera connector.

    2. Disconnect the K26 spiral cable sub-assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K26-9 (LDA) - S18-2 (STRV) Always Below 1 Ω
      K26-9 (LDA) or S18-2 (STRV) - Body ground Engine switch off 10 kΩ or higher

    4. Connect the K26 spiral cable sub-assembly connector.

    5. Connect the S18 forward recognition camera connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE SPIRAL CABLE SUB-ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR