LKA/LDA SYSTEM, Diagnostic DTC:C1A75

DTC Code DTC Name
C1A75 Lost Communication with Steering Vibrator System

DESCRIPTION

The LKA/LDA system (forward recognition camera) communicates with the steering vibration ECU via LIN communication.

If a communication error between the LKA/LDA system (forward recognition camera) and steering vibration ECU is detected, DTC C1A75 is stored.

DTC No. DTC Detection Condition Trouble Area
C1A75

When all of the following conditions are met:


  • The LKA/LDA system is on

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

  • 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 with sensor cable sub-assembly

  • No. 1 switch wire

  • Harness or connector

WIRING DIAGRAM

A000NPYE11

CAUTION / NOTICE / HINT

Note


  • Inspect the fuses for circuits related to this system before performing the following inspection 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 Recognition Camera/Target Position Memory and Recognition Camera Axis Adjust Click here.

PROCEDURE


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


    1. Disconnect the Y17 forward recognition camera connector.

    2. Disconnect the z25 spiral with sensor cable sub-assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      z25-2 (LDA) - Y17-2 (STRV) Always Below 1 Ω
      z25-2 (LDA) or Y17-2 (STRV) - Body ground Power switch off 10 kΩ or higher

    NG

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

    OK

  2. INSPECT STEERING VIBRATION ECU (IG VOLTAGE)


    1. Disconnect the z24 spiral with sensor cable sub-assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      z24-4 (BHT) - Body ground Power switch on (IG) 11 to 14 V

    3. Turn the power switch off.


    NG

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

    OK

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


    1. Disconnect the z24 spiral with sensor cable sub-assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      z24-1 (EHT) - Body ground Always Below 1 Ω

    NG

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

    OK

  4. CHECK NO. 1 SWITCH WIRE


    1. Disconnect the z25 spiral with sensor cable sub-assembly connector.

    2. Disconnect the B No. 1 switch wire connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      z25-2 (LDA) - B-2 (LDA) Always Below 1 Ω
      z25-2 (LDA) or B-2 (LDA) - Body ground Power switch off 10 kΩ or higher

    NG

    REPLACE NO. 1 SWITCH WIRE Click here

    OK

  5. REPLACE STEERING WHEEL ASSEMBLY (STEERING VIBRATOR ECU)


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


    NEXT

  6. CHECK DTC OUTPUT (LKA/LDA SYSTEM)


    1. Clear the DTCs Click here.

    2. Make sure that the DTC detection conditions are met.

      Tech Tips

      If the detection conditions are not met, the system cannot detect the malfunction.


      1. Turn the power switch on (IG).

      2. Turn the LKA/LDA system ON.

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

    3. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC C1A75 is output A
      DTC C1A75 is not output B

    A

    REPLACE FORWARD RECOGNITION CAMERA Click here

    B

    END (STEERING VIBRATOR ECU WAS DEFECTIVE)

  7. CHECK HARNESS AND CONNECTOR (SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY- FORWARD RECOGNITION CAMERA)


    1. Disconnect the Y17 forward recognition camera connector.

    2. Disconnect the N31 spiral with sensor cable sub-assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N31-9 (LDA) - Y17-2 (STRV) Always Below 1 Ω
      N31-9 (LDA) or Y17-2 (STRV) - Body ground Power switch off 10 kΩ or higher

    OK

    REPLACE SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

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


    1. Disconnect the N174 spiral with sensor cable with sensor subassembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      N174-4 (BHT) - Body ground Power switch on (IG) 11 to 14 V

    OK

    REPLACE SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY Click here

    NG

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

  9. CHECK HARNESS AND CONNECTOR (SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY - BODY GROUND)


    1. Disconnect the N174 spiral with sensor cable sub-assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N174-2 (EHT) - Body ground Always Below 1 Ω

    OK

    REPLACE SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY Click here

    NG

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