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

Toyota Yaris XP210 (2020-2023) 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

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...

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