Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Front Radar Sensor Incorrect Axial Gap (C1A11,C1A14)

DESCRIPTION

The driving support ECU assembly uses the millimeter wave radar sensor assembly to detect obstacles in front of the vehicle.

Based on signals from the millimeter wave radar sensor assembly, the driving support ECU assembly sends pre-collision system control operation signals.

When the vehicle is determined to be driving in a straight line or on a gradual curve based on signals from the yaw rate sensor, etc., the millimeter wave radar sensor assembly performs self diagnosis to check if the sensor beam axis has deviated. If the millimeter wave radar sensor assembly beam axis has deviated, the driving support ECU assembly detects this and stores DTC C1A11.

After installing a new millimeter wave radar sensor assembly, if sensor beam axis adjustment has not been performed, DTC C1A14 will be stored.

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. As a result, a DTC may be stored.
• When the millimeter wave radar sensor assembly is replaced with a new one, adjustment of the radar sensor beam axis must be performed.

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PROCEDURE

(a) Perform millimeter wave radar sensor assembly adjustment.

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NEXT

(a) Clear the DTCs.

(b) Make sure that the DTC detection conditions are met.

HINT:

If the detection conditions are not met, the system cannot detect the malfunction.

(c) Check for DTCs.

A

END

B

REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY