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

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DTC Code DTC Name
C1A75 Lost Communication with Steering Vibrator System
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DESCRIPTION

The forward recognition camera communicates with the steering vibration ECU (steering vibration and heater ECU) via LIN communication.

If a communication error between the forward recognition camera and steering vibration ECU (steering vibration and heater 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 (w/ Steering Control) is on.

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

  • Forward recognition camera

  • Steering vibration ECU (Steering vibration and heater ECU)

  • Spiral cable sub-assembly

  • Wire harness or connector
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WIRING DIAGRAM

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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.

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PROCEDURE


  1. Click here

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


    1. Turn the engine switch off.

    2. Disconnect the W18 forward recognition camera connector.

    3. Disconnect the z12 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
      z12-2 (LDA) (spiral cable sub-assembly side) - W18-2 (STRV) Always Below 1 Ω
      z12-2 (LDA) (spiral cable sub-assembly side) or W18-2 (STRV) - Body ground Engine switch off 10 kΩ or higher

    5. Connect the W18 forward recognition camera connector.

    6. Connect the z12 spiral cable sub-assembly connector.

      Result
      Proceed to
      OK
      NG

  2. Click here

    INSPECT STEERING VIBRATION ECU (STEERING VIBRATION AND HEATER ECU) (IG VOLTAGE)


    1. Disconnect the z10 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
      z10-4 (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 z10 spiral cable sub-assembly connector.

      Result
      Proceed to
      OK
      NG

  3. Click here

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


    1. Disconnect the z10 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
      z10-1 (EHT) (spiral cable sub-assembly side) - Body ground Always Below 1 Ω

    3. Connect the z10 spiral cable sub-assembly connector.

      Result
      Proceed to
      OK
      NG

  4. Click here

    INSPECT NO. 1 SWITCH WIRE


    1. B0066F5C25
      *a

      No. 1 Switch Wire Connector

      (to Spiral Cable Sub-assembly)
      *b

      No. 1 Switch Wire Connector

      (to steering vibration ECU (steering vibration and heater ECU))

      Disconnect the z12 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 vibration and heater ECU).

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      z12-2 (LDA) - A-2 (LDW) Always Below 1 Ω
      z12-2 (LDA) or A-2 (LDW) - Body ground Always 1 kΩ or higher

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

    5. Connect the z12 No. 1 switch wire connector to the spiral cable sub-assembly.

      Result
      Proceed to
      OK
      NG

  5. Click here

    REPLACE STEERING VIBRATION ECU (STEERING VIBRATION AND HEATER ECU)


    1. Replace the steering vibration ECU (steering vibration and heater ECU).

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      Result
      Proceed to
      NEXT

  6. Click here

    CHECK FOR DTCs (LANE DEPARTURE ALERT SYSTEM (w/ Steering Control))


    1. Clear the DTCs.

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      1. Chassis > LKA/LDA > Clear DTCs


    2. Perform the following procedure.

      Tip:

      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 (w/ Steering Control) 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.

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      1. 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 (STEERING VIBRATION AND HEATER ECU) WAS DEFECTIVE)

    • B

      REPLACE FORWARD RECOGNITION CAMERAClick here

  7. Click here

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


    1. Disconnect the O144 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
      O144-2 (EHT) (connector side) - Body ground Always Below 1 Ω

    3. Connect the O144 spiral cable sub-assembly connector.

      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE SPIRAL CABLE SUB-ASSEMBLYClick here

    • NG

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

  8. Click here

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


    1. Disconnect the O144 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
      O144-4 (BHT) (connector side) - Body ground Engine switch on (IG) 11 to 14 V

    4. Turn the engine switch off.

    5. Connect the O144 spiral cable sub-assembly connector.

      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE SPIRAL CABLE SUB-ASSEMBLYClick here

    • NG

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

  9. Click here

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


    1. Disconnect the W18 forward recognition camera connector.

    2. Disconnect the O25 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
      O25-9 (LDA) - W18-2 (STRV) Always Below 1 Ω
      O25-9 (LDA) or W18-2 (STRV) - Body ground Engine switch off 10 kΩ or higher

    4. Connect the O25 spiral cable sub-assembly connector.

    5. Connect the W18 forward recognition camera connector.

      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE SPIRAL CABLE SUB-ASSEMBLYClick here

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR