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) Reapir and Service Manual: Utility


    UTILITY NOTICE: If the forward recognition camera has been replaced due to a malfunction in the lane tracing assist system, make sure to perform forward recognition camera adjustment. Otherwise all of the systems that use the forward recognition camera will not operate normally...

    Toyota Yaris XP210 (2020-2024) Reapir and Service Manual: Engine Hood Courtesy Switch Circuit


    DESCRIPTION The engine stop and start ECU detects whether the engine hood is open or closed based on a signal received from the engine hood courtesy switch built into the hood lock assembly. The engine stop and start ECU prohibits starting of the engine by stop and start control and changes the mode to "stalled" if the engine hood is open with the clutch pedal is released while the engine is stopped by stop and start control...

    Categories

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    The front seat belt pretensioners are designed to deploy in moderate or severe frontal, near frontal collisions.

    In addition, the pretensioners operate when a side collision or a rollover accident is detected. The pretensioners operate differently depending on what types of air bags are equipped. For more details about the seat belt pretensioner operation, refer to the SRS Air Bag Deployment Criteria.

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