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 (w/ steering control) 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.

  • The lane departure alert is set to steering vibrator.

  • Forward recognition camera

  • Steering vibration ECU (Steering wheel assembly)

  • Spiral cable sub-assembly

  • Harness and connector

WIRING DIAGRAM

B005981E01

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 Learning.

    Click here

PROCEDURE


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


    1. Turn the engine switch off.

    2. Disconnect the T17 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) - T17-2 (STRV) Always Below 1 Ω
      z15-2 (LDA) (spiral cable sub-assembly side) or T17-2 (STRV) - Body ground Engine switch off 10 kΩ or higher

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

    6. Connect the T17 forward recognition camera 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 z13 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
      z13-4 (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 z13 spiral cable sub-assembly connector.

      Result
      Proceed to
      OK
      NG

    NG

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

    OK

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


    1. Disconnect the z13 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
      z13-1 (EHT) (spiral cable sub-assembly side) - Body ground Always Below 1 Ω

    3. Connect the z13 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. B0058S2C09
      *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 (LDW) Always Below 1 Ω
      z15-2 (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 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 for Automatic Transaxle (U661E): Click here for Automatic Transaxle (U661F): Click here for CVT (K114): Click here for CVT (K114F): Click here

    OK

  5. REPLACE STEERING VIBRATOR ECU (STEERING WHEEL ASSEMBLY)


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

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  6. CHECK FOR DTCs


    1. Clear the DTCs.

      Click here


      Chassis > LKA/LDA > Clear DTCs

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

      Tech Tips

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

    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 VIBRATOR ECU WAS DEFECTIVE)

    B

    REPLACE FORWARD RECOGNITION CAMERA Click here

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


    1. Disconnect the I157 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
      I157-2 (EHT) (connector side) - Body ground Always Below 1 Ω

    3. Connect the I157 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 VIBRATOR ECU POWER SOURCE CIRCUIT)


    1. Disconnect the I157 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
      I157-4 (BHT) (connector side) - Body ground Engine switch on (IG) 11 to 14 V

    4. Turn the engine switch off.

    5. Connect the I157 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 VIBRATOR ECU POWER SOURCE CIRCUIT)

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


    1. Disconnect the T17 forward recognition camera connector.

    2. Disconnect the I4 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
      I4-9 (LDA) - T17-2 (STRV) Always Below 1 Ω
      I4-9 (LDA) or T17-2 (STRV) - Body ground Engine switch off 10 kΩ or higher

    4. Connect the I4 spiral cable sub-assembly connector.

    5. Connect the T17 forward recognition camera connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE SPIRAL CABLE SUB-ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR