| Last Modified: 04-05-2023 | 6.11:8.1.0 | Doc ID: RM1000000018K3D |
| Model Year Start: 2018 | Model: Sienna | Prod Date Range: [11/2017 - ] |
| Title: CRUISE CONTROL: LANE DEPARTURE ALERT SYSTEM(w/ Steering Control): C1A11,C1A14; Front Radar Sensor Incorrect Axial Gap; 2018 - 2020 MY Sienna [11/2017 - ] | ||
|
DTC |
C1A11 |
Front Radar Sensor Incorrect Axial Gap |
|
DTC |
C1A14 |
Front Radar Sensor Beam Axis Not Adjusted |
DESCRIPTION
The forward recognition camera uses the millimeter wave radar sensor assembly to detect obstacles in front of the vehicle.
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 from the vehicle movement direction. When the millimeter wave radar sensor assembly beam axis has deviated, the forward recognition camera detects this, and 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 |
|---|---|---|---|
|
C1A11 |
Front Radar Sensor Incorrect Axial Gap |
2 seconds after the ignition switch is turned to ON, misalignment of the millimeter wave radar sensor assembly is detected for approximately 5 seconds. |
|
|
C1A14 |
Front Radar Sensor Beam Axis Not Adjusted |
2 seconds after the ignition switch is turned to ON, incompletion of the millimeter wave radar sensor beam axis alignment is detected for approximately 5 seconds. |
|
CAUTION / NOTICE / HINT
NOTICE:
- When replacing the forward recognition camera, always replace it with a new one. If a forward recognition camera which was installed to another vehicle is used, the information stored in the forward recognition camera will not match the information from the vehicle. As a result, a DTC may be stored.
-
If the forward recognition camera has been replaced with a new one, be sure to perform forward recognition camera adjustment.
Click here
![2018 - 2020 MY Sienna [11/2017 - ]; CRUISE CONTROL: FRONT CAMERA: ADJUSTMENT (SEQUENTIAL RECOGNITION)](/t3Portal/stylegraphics/info.gif)
- 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
-
The lane departure alert system uses the CAN communication system. First, confirm that there are no malfunctions in the CAN communication system. Refer to How to Proceed with Troubleshooting.
Click here
PROCEDURE
|
1. |
CHECK FOR DTCs (LANE DEPARTURE ALERT SYSTEM) |
(a) Check for DTCs.
Click here
|
Result |
Proceed to |
|---|---|
|
Current DTC C1A11 is output |
A |
|
Current DTC C1A14 is output |
B |
|
History DTC C1A11 is output |
C |
| B |
|
| C |
|
|
|
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 been towed. |
A |
|
Vehicle is overloaded or has been towed. |
B |
| B |
|
|
|
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 |
|
|
|
4. |
ADJUST WHEEL ALIGNMENT |
(a) Adjust the alignment (toe) of the wheels.
Click here
|
|
5. |
ADJUST MILLIMETER WAVE RADAR SENSOR ASSEMBLY |
(a) Perform millimeter wave radar sensor assembly adjustment.
Click here
|
|
6. |
CHECK FOR DTCs (LANE DEPARTURE ALERT 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 forward recognition camera.
(a) Clear the DTCs.
Click here
(b) Perform the following procedure.
HINT:
If the following procedure is not performed, the previously output DTC cannot be detected.
- Turn the ignition switch to ON and wait 7 seconds or more.
(c) Check for DTCs.
Click here
|
Result |
Proceed to |
|---|---|
|
DTC C1A11 is not output |
A |
|
DTC C1A11 is output |
B |
| A |
|
END |
| B |
|
|
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 |
|
|
|
8. |
REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY |
(a) Replace the millimeter wave radar sensor assembly.
Click here
| NEXT |
|
|
9. |
ADJUST MILLIMETER WAVE RADAR SENSOR ASSEMBLY |
(a) Return the vehicle to normal operating conditions.
(b) Perform millimeter wave radar sensor assembly adjustment.
Click here
|
|
10. |
CHECK FOR DTCs (LANE DEPARTURE ALERT SYSTEM) |
(a) Clear the DTCs.
Click here
(b) Perform the following procedure.
HINT:
If the following procedure is not performed, the previously output DTC cannot be detected.
- Turn the ignition switch to ON and wait 7 seconds or more.
(c) Check for DTCs.
Click here
|
Result |
Proceed to |
|---|---|
|
DTC C1A11 is not output |
A |
|
DTC C1A11 is output |
B |
| A |
|
END |
| B |
|
|
11. |
ADJUST MILLIMETER WAVE RADAR SENSOR ASSEMBLY |
(a) Perform millimeter wave radar sensor assembly adjustment.
Click here
|
|
12. |
CHECK FOR DTCs (LANE DEPARTURE ALERT 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 forward recognition camera.
(a) Clear the DTCs.
Click here
(b) Perform the following procedure.
HINT:
If the following procedure is not performed, the previously output DTC cannot be detected.
- Turn the ignition switch to ON and wait 7 seconds or more.
(c) Check for DTCs.
Click here
|
Result |
Proceed to |
|---|---|
|
DTC C1A14 is not output |
A |
|
DTC C1A14 is output |
B |
| A |
|
END |
| B |
|
|
13. |
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 |
| A |
|
|
|
14. |
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 |
|
| NG |
|
|
15. |
CLEAR DTC (LANE DEPARTURE ALERT SYSTEM) |
(a) Check for DTCs related to misalignment of millimeter wave radar sensor assembly.
HINT:
If only history DTCs are stored, they may have 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
| NEXT |
|
END |
|
16. |
REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY |
(a) Replace the millimeter wave radar sensor assembly.
Click here
| NEXT |
|
|
|