Toyota Yaris: Front Radar Sensor System / Microwave Integrated Circuit (VCO Circuit) in Front Radar Sensor Internal Electronic Failure (C1A8749-C1A8987,C1A8C08)

Toyota Yaris XP210 (2020-2024) Reapir and Service Manual / Engine & Hybrid System / Cruise Control / Front Radar Sensor System / Microwave Integrated Circuit (VCO Circuit) in Front Radar Sensor Internal Electronic Failure (C1A8749-C1A8987,C1A8C08)

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

C1A8749

Microwave Integrated Circuit (VCO Circuit) in Front Radar Sensor Internal Electronic Failure

When the ignition switch is ON, the millimeter wave radar sensor assembly detects a malfunction in the microwave integrated circuit (VCO circuit).

Millimeter wave radar sensor assembly

C1A8887

Microwave Integrated Circuit to Antenna in Front Radar Sensor Missing Message

When the ignition switch is ON, the millimeter wave radar sensor assembly detects a malfunction in the transmitting antenna.

Millimeter wave radar sensor assembly

C1A8987

Antenna to Microwave Integrated Circuit in Front Radar Sensor Missing Message

When the ignition switch is ON, the millimeter wave radar sensor assembly detects a malfunction in the receiving antenna.

Millimeter wave radar sensor assembly

C1A8C08

Main Microcomputer in Front Radar Sensor Bus Signal / Message Failure

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

HINT:

Click here

NEXT

END

    Vehicle Control History

    VEHICLE CONTROL HISTORY NOTICE: Vehicle control history may be recorded due to the replacement or repair of related parts. CHECK VEHICLE CONTROL HISTORY (FRONT RADAR SENSOR SYSTEM) (a) According to the display on the GTS, check the vehicle control history...

    Internal Control Module Software Incompatibility Not Programmed (U030051,U030057)

    DESCRIPTION The millimeter wave radar sensor assembly receives vehicle information from the ECM via the CAN communication line. If the millimeter wave radar sensor assembly cannot confirm the vehicle information sent from the ECM, the millimeter wave radar sensor assembly stores DTC U030051...

    Other information:

    Toyota Yaris XP210 (2020-2024) Owner's Manual: Picture Quality Adjustment


    Picture quality adjustment can be done while the shift lever is in reverse (R). There are four settings which can be adjusted including, brightness, contrast, tint, and color. When adjusting, pay sufficient attention to the vehicle surroundings...

    Toyota Yaris XP210 (2020-2024) Reapir and Service Manual: Removal


    REMOVAL CAUTION / NOTICE / HINT The necessary procedures (adjustment, calibration, initialization, or registration) that must be performed after parts are replaced during forward recognition camera removal/installation are shown below. Necessary Procedure After Parts Removed/Installed/Replaced Replacement Part or Performed Procedure Necessary Procedure Effect/Inoperative Function when Necessary Procedure not Performed Link Forward recognition camera Adjust forward recognition camera Dynamic Radar Cruise Control System Front Camera System Lane Tracing Assist System Pre-collision System Automatic High Beam System One Time Recognition: Sequential Recognition: Driving Adjustment: Update ECU security key Vehicle control history (RoB) are stored NOTICE: When replacing the forward recognition camera, replace it with a new one...

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