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 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.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C1A11

Front Radar Sensor Incorrect Axial Gap

When the engine switch is on (IG), misalignment of the millimeter wave radar sensor assembly is detected for approximately 0.2 seconds.

Millimeter wave radar sensor assembly

C1A14

Front Radar Sensor Beam Axis Not Adjusted

When the vehicle is being driven at a speed of 10 km/h (7 mph) or more, incompletion of the millimeter wave radar sensor assembly beam axis alignment is detected for approximately 0.2 seconds.

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. 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.

    Click here

PROCEDURE

1.

ADJUST MILLIMETER WAVE RADAR SENSOR ASSEMBLY

(a) Perform millimeter wave radar sensor assembly adjustment.

Click here

NEXT

2.

CHECK FOR DTCs

(a) Clear the DTCs.

Body Electrical > Pre-Collision 2 > Clear 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.

Body Electrical > Pre-Collision 2 > Trouble Codes

Result

Proceed to

DTC C1A11 and C1A14 are not output

A

DTC C1A11 or C1A14 is output

B

A

END

B

REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY

    Front Radar Sensor (C1A10)

    Yaw Rate Sensor (C1A46)

    See More:

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