Toyota CH-R Service Manual: Front Radar Sensor Incorrect Axial Gap (C1A11,C1A14)

DESCRIPTION

When the system determines that the vehicle is driving straight ahead based on signals from the yaw rate and acceleration sensor (airbag sensor assembly), etc., the millimeter wave radar sensor assembly performs self-diagnosis to check if the sensor beam axis is misaligned.

C1A11 is output when it is determined that the millimeter wave radar sensor assembly beam axis is misaligned.

If sensor beam axis adjustment is not performed after installing a new millimeter wave radar sensor assembly, C1A14 is output.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
C1A11	Front Radar Sensor Incorrect Axial Gap	After the ignition switch is turned to ON, misalignment of the millimeter wave radar sensor assembly continues for 0.1 seconds or more	Millimeter wave radar sensor assembly
C1A14	Front Radar Sensor Beam Axis Not Adjusted	At a vehicle speed of 10 km/h (7 mph) or higher, axis misalignment of the millimeter wave radar sensor assembly was not adjusted for 0.1 seconds or more	Millimeter wave radar sensor assembly

CAUTION / NOTICE / HINT

PROCEDURE

1.	CHECK FOR DTCs (PRE-COLLISION SYSTEM)

(a) Check if the stored DTCs are current DTCs.

(b) Check for DTCs.

Click here

Body Electrical > Pre-Collision 2 > Trouble Codes

Result	Proceed to
Current DTC C1A11 is output	A
Current DTC C1A14 is output	B
History DTC C1A11 is output	C

B

GO TO STEP 12

C

GO TO STEP 14

A

2.	CHECK VEHICLE CONDITION

(a) Check the operating conditions of the vehicle.

HINT:

DTC C1A11 may be stored if the millimeter wave radar sensor assembly beam axis is temporarily misaligned due to the vehicle being overloaded.

Result	Proceed to
Vehicle is not overloaded or has not been towed.	A
Vehicle is overloaded or has been towed.	B

B

GO TO STEP 10

A

3.	CHECK WHEEL ALIGNMENT

(a) Check the front and rear wheel alignment (toe).

Click here

HINT:

DTC C1A11 may be stored if the millimeter wave radar sensor assembly beam axis is misaligned due to incorrect wheel alignment (toe).

Result	Proceed to
Front or rear wheel is misaligned (toe)	A
Front and rear wheels are not misaligned (toe)	B

B

GO TO STEP 7

A

4.	ADJUST WHEEL ALIGNMENT

(a) Adjust the alignment (toe) of the wheels.

Click here

NEXT

5.	ADJUST MILLIMETER WAVE RADAR SENSOR ASSEMBLY

(a) Perform millimeter wave radar sensor assembly adjustment.

Click here

NEXT

6.	CHECK FOR DTCs (PRE-COLLISION SYSTEM)

HINT:

After performing the radar sensor beam axis adjustment, if the same DTC is output again after the DTC detection conditions are met, replace the millimeter wave radar sensor assembly.

(a) Clear the DTCs.

Click here

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.

Click here

Body Electrical > Pre-Collision 2 > Trouble Codes

Result	Proceed to
DTC C1A11 is not output	A
DTC C1A11 is output	B

A

END

B

GO TO STEP 8

7.	INSPECT MILLIMETER WAVE RADAR SENSOR ASSEMBLY

(a) Check that the bracket of the millimeter wave radar sensor assembly is not deformed.

HINT:

When the bracket is deformed, replace the millimeter wave radar sensor assembly.

OK:

The bracket is not deformed.

OK

GO TO STEP 5

NG

GO TO STEP 8

8.	REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY

(a) Replace the millimeter wave radar sensor assembly.

Click here

(b) Adjust the millimeter wave radar sensor assembly.

Click here

NEXT

9.	CLEAR DTC (PRE-COLLISION SYSTEM)

(a) Clear the DTCs.

Click here

Body Electrical > Pre-Collision 2 > Clear DTCs

NEXT

END (MILLIMETER WAVE RADAR SENSOR ASSEMBLY WAS DEFECTIVE)

10.	ADJUST MILLIMETER WAVE RADAR SENSOR ASSEMBLY

(a) Return the vehicle to normal operating conditions.

(b) Perform millimeter wave radar sensor assembly adjustment.

Click here

NEXT

11.	CHECK DTC OUTPUT (PRE-COLLISION SYSTEM)

(a) Clear the DTCs.

Click here

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.

Click here

Body Electrical > Pre-Collision 2 > Trouble Codes

Result	Proceed to
DTC C1A11 is not output	A
DTC C1A11 is output	B

A

END (MILLIMETER WAVE RADAR SENSOR ASSEMBLY WAS MISALIGNED DUE TO THE VEHICLE BEING OVERLOADED OR TOWED)

B

GO TO STEP 3

12.	ADJUST MILLIMETER WAVE RADAR SENSOR ASSEMBLY

(a) Perform millimeter wave radar sensor assembly adjustment.

Click here

NEXT

13.	CHECK FOR DTCs (PRE-COLLISION SYSTEM)

HINT:

After performing the radar sensor beam axis adjustment, if the same DTC is output again after the DTC detection conditions are met, replace the millimeter wave radar sensor assembly.

(a) Clear the DTCs.

Click here

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.

Click here

Body Electrical > Pre-Collision 2 > Trouble Codes

Result	Proceed to
DTC C1A14 is not output	A
DTC C1A14 is output	B

A

END (SENSOR BEAM AXIS ADJUSTMENT WAS NOT COMPLETED)

B

GO TO STEP 8

14.	CLEAR DTC (PRE-COLLISION SYSTEM)

(a) Check for DTCs related to misalignment of millimeter wave radar sensor assembly.

HINT:

If only history DTCs are stored, they may have been stored due to a temporarily condition such as overloading of the vehicle, and the system returned to normal when beam axis learning was performed.

(b) Clear the DTCs.

Click here

Body Electrical > Pre-Collision 2 > Clear DTCs

NEXT

END