Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Main Microcomputer in Front Radar Sensor System Internal Failure (C1A8C04,C1A8C46,C1A8D1C,C1A9000)

Toyota Corolla Cross (2022-2024) Service Manual / ADAS & AD / Advanced Driver Assistance System / Front Radar Sensor System / Main Microcomputer in Front Radar Sensor System Internal Failure (C1A8C04,C1A8C46,C1A8D1C,C1A9000)

DESCRIPTION

When an internal malfunction is detected in the millimeter wave radar sensor assembly, a DTC is stored.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

DTC Output from

C1A8C04

Main Microcomputer in Front Radar Sensor System Internal Failure

When the ignition switch is ON, a millimeter wave radar sensor assembly internal malfunction is detected

Millimeter wave radar sensor assembly

Front Radar Sensor

C1A8C46

Main Microcomputer in Front Radar Sensor Calibration/Parameter Memory Failure

When the ignition switch is ON, the millimeter wave radar sensor assembly detects an internal memory malfunction

Millimeter wave radar sensor assembly

Front Radar Sensor

C1A8D1C

Power Supply Circuit in Front Radar Sensor Circuit Voltage Out of Range

When the ignition switch is ON, the millimeter wave radar sensor assembly detects a power source circuit malfunction

Millimeter wave radar sensor assembly

Front Radar Sensor

C1A9000

Malfunction of Millimeter-wave Circuit in Front Radar Sensor

When the ignition switch is ON, the millimeter wave radar sensor assembly detects an internal millimeter wave circuit malfunction

Millimeter wave radar sensor assembly

Front Radar Sensor

CAUTION / NOTICE / HINT

NOTICE:

  • When replacing the millimeter wave radar sensor assembly, always replace it with a new one. If a millimeter wave radar sensor assembly which was installed to another vehicle is used, the information stored in the millimeter wave radar sensor assembly will not match the information from the vehicle and a DTC may be stored.
  • When the millimeter wave radar sensor assembly has been replaced with a new one, it is necessary to perform millimeter wave radar sensor assembly beam axis alignment and to clear the vehicle control history. Before performing the Driving Adjustment, make sure to read Before Starting Driving Adjustment.

    HINT:

    Beam axis alignment of the millimeter wave radar sensor assembly can be performed using either Triangle Target, Flat Surface Target or Driving Adjustment.

    Triangle Target: Click here

    Flat Surface Target: Click here

    Driving Adjustment: Click here

PROCEDURE

1.

REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY

Click here

NEXT

END

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    SEE MORE:

     Installation

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