| Last Modified: 04-05-2023 | 6.11:8.1.0 | Doc ID: RM1000000018YBH |
| Model Year Start: 2018 | Model: Sienna | Prod Date Range: [11/2017 - ] |
| Title: PRE-COLLISION: PRE-COLLISION SYSTEM: 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 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 ignition switch is ON, misalignment of the millimeter wave radar sensor assembly is detected for approximately 0.2 seconds. |
|
|
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 beam axis alignment is detected for approximately 0.2 seconds. |
|
CAUTION / NOTICE / HINT
NOTICE:
- When replacing the driving support ECU assembly, always replace it with a new one. If a driving support ECU assembly which was installed to another vehicle is used, the information stored in the driving support ECU assembly will not match the information from the vehicle. As a result, a DTC may be stored.
- 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
![2018 - 2020 MY Sienna [11/2017 - ]; CRUISE CONTROL: MILLIMETER WAVE RADAR SENSOR: ADJUSTMENT](/t3Portal/stylegraphics/info.gif)
PROCEDURE
|
1. |
CHECK FOR DTCs (PRE-COLLISION 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 not 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).
for Front: Click here
for Rear: 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.
for Front: Click here
for Rear: Click here
|
|
5. |
ADJUST MILLIMETER WAVE RADAR SENSOR ASSEMBLY |
(a) Perform millimeter wave radar sensor assembly adjustment.
Click here
|
|
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 driving support ECU assembly.
(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 0.2 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 DTC OUTPUT (PRE-COLLISION 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 0.2 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 (MILLIMETER WAVE RADAR SENSOR ASSEMBLY WAS MISALIGNED DUE TO THE VEHICLE BEING OVERLOADED OR TOWED) |
|
|
11. |
CHECK WHEEL ALIGNMENT |
(a) Check the front and rear wheel alignment (toe).
for Front: Click here
for Rear: 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 |
|
|
|
12. |
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 |
|
|
|
13. |
REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY |
(a) Replace the millimeter wave radar sensor assembly.
Click here
| NEXT |
|
|
14. |
ADJUST MILLIMETER WAVE RADAR SENSOR ASSEMBLY |
(a) Perform millimeter wave radar sensor assembly adjustment.
Click here
|
|
15. |
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 driving support ECU assembly.
(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.
- Drive the vehicle at a speed of 10 km/h (7 mph) or more for 0.2 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 (SENSOR BEAM AXIS ADJUSTMENT WAS NOT COMPLETED) |
| B |
|
|
16. |
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
| NEXT |
|
END |
|
|