Code No.C1704 LDW CAMERA high temperature

  • Before replacing the ECU, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.


The LDW-ECU will store diagnosis code No. C1704 when it determines that the temperature inside the LDW camera is 85°C or more.
note The diagnosis code No. C1704 indicates that the LDW-ECU has activated a protective mechanism, but is not abnormal. However, if diagnosis code No. C1704 is stored frequently, follow this inspection procedure.



STEP 1. Check whether the diagnosis code is reset.

Follow the procedure below to check whether the LDW-ECU stores diagnosis code No. C1704.
(1)Move the vehicle to the cool place which is not subject to bright sunlight in order to cool down the LDW camera.
(2)Erase the diagnosis code.
(3)Turn the ignition switch from the LOCK (OFF) position to the ON position.
(4)Check if the diagnosis code is set.

Q. Is the diagnosis code set?

Replace the LDW-ECU.

The diagnosis is complete.