Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001GZ0V
Model Year Start: 2020 Model: Corolla Prod Date Range: [01/2019 - 09/2022]
Title: CRUISE CONTROL: FRONT RADAR SENSOR SYSTEM (for HV Model): C1A8C46,C1A8D1C,C1A9000,C1A9100; Main Microcomputer in Front Radar Sensor Calibration/Parameter Memory Failure; 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]

DTC

C1A8C46

Main Microcomputer in Front Radar Sensor Calibration/Parameter Memory Failure

DTC

C1A8D1C

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

DTC

C1A9000

Malfunction of Millimeter-wave Circuit in Front Radar Sensor

DTC

C1A9100

Malfunction of Acceleration Sensor in Front Radar Sensor

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

C1A8C46

Main Microcomputer in Front Radar Sensor Calibration/Parameter Memory Failure

When the power switch is on (IG), the millimeter wave radar sensor assembly detects an internal memory malfunction

Millimeter wave radar sensor assembly

C1A8D1C

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

When the power switch is on (IG), the millimeter wave radar sensor assembly detects a power source circuit malfunction

Millimeter wave radar sensor assembly

C1A9000

Malfunction of Millimeter-wave Circuit in Front Radar Sensor

When the power switch is on (IG), the millimeter wave radar sensor assembly detects an internal millimeter wave circuit malfunction

Millimeter wave radar sensor assembly

C1A9100

Malfunction of Acceleration Sensor in Front Radar Sensor

When the power switch is on (IG), the millimeter wave radar sensor assembly detects an internal acceleration sensor malfunction

Millimeter wave radar sensor assembly

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 is replaced with a new one, adjustment of the millimeter wave radar sensor beam axis must be performed.

    Click here 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; CRUISE CONTROL: MILLIMETER WAVE RADAR SENSOR: ADJUSTMENT 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2022]; CRUISE CONTROL: MILLIMETER WAVE RADAR SENSOR: ADJUSTMENT

PROCEDURE

1.

REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY

(a) Replace the millimeter wave radar sensor assembly with a new one.

Click here 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 09/2022]; CRUISE CONTROL: MILLIMETER WAVE RADAR SENSOR: REMOVAL

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