Toyota Avalon 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 objects in front of the vehicle.

When it is determined that the vehicle is being driven in a straight line or on a gradual curve based on signals from the yaw rate sensor, the millimeter wave radar sensor assembly performs self-diagnosis to check if the sensor beam axis has deviated. When the millimeter wave radar sensor assembly beam axis is misaligned, the driving support ECU assembly stores DTC C1A11.

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

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

C1A11

Front Radar Sensor Incorrect Axial Gap

When the vehicle is being driven at a speed of 5 km/h (3 mph) or more and the dynamic radar cruise control system is operating, misalignment of the millimeter wave radar sensor assembly is detected for approximately 0.3 seconds or more.

Pre-collision system

Does not come on

C1A14

Front Radar Sensor Beam Axis Not Adjusted

When the vehicle is being driven at a speed of 5 km/h (3 mph) or more and the dynamic radar cruise control system is operating, incompletion of the millimeter wave radar sensor assembly beam axis alignment is detected for approximately 0.3 seconds or more.

Pre-collision system

Does not come on

PROCEDURE

1.

GO TO PRE-COLLISION SYSTEM

HINT:

If DTC C1A11 or C1A14 is output by the dynamic radar cruise control system, perform troubleshooting for the pre-collision system.

Click here

NEXT

END

    Front Radar Sensor (C1A10)

    Driving Support ECU Communication Abnormal (C1A52)

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