- Millimeter wave radar sensor assembly
- Driving support ECU assembly
| Last Modified: 04-05-2023 | 6.11:8.1.0 | Doc ID: RM1000000018WS7 |
| Model Year Start: 2018 | Model: Sienna | Prod Date Range: [11/2017 - ] |
| Title: CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL 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 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 and acceleration 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. |
DTC Detection Condition |
Trouble Area |
MIL |
|---|---|---|---|
|
C1A11 |
When the vehicle is being driven at a speed of 36 km/h (22 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. |
|
Does not come on |
|
C1A14 |
When the vehicle is being driven at a speed of 36 km/h (22 mph) or more and the dynamic radar cruise control system is operating, incompletion of the millimeter wave radar sensor beam axis alignment is detected for approximately 0.3 seconds or more. |
|
Does not come on |
CAUTION / NOTICE / HINT
NOTICE:
- When replacing the driving support ECU assembly, make sure to replace it with a new one. If a device 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, and 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)
-
First check the CAN communication system by following How to Proceed with Troubleshooting. After checking that there are no malfunctions in the CAN communication system, proceed with troubleshooting.
Click here
- If only history DTCs are stored, they may have been stored due to a temporarily condition such as overloading of the vehicle.
PROCEDURE
|
1. |
CHECK FOR DTCs (RADAR CRUISE 2) |
HINT:
If only history DTCs are stored, they may have been stored due to a temporarily condition such as overloading of the vehicle.
(a) Check if the stored DTCs are current DTCs.
(b) Connect the Techstream to the DLC3.
(c) Turn the ignition switch to ON.
(d) Enter the following menus: Body Electrical / Radar Cruise 2 / Trouble Codes.
Click here
(e) 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 being towed. |
A |
|
Vehicle is overloaded or being towed. |
B |
| B |
|
|
|
3. |
CHECK WHEEL ALIGNMENT |
(a) Check the front 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 wheel is misaligned (toe) |
A |
|
Front wheels are not misaligned (toe) |
B |
| B |
|
|
|
4. |
ADJUST WHEEL ALIGNMENT |
(a) Adjust the alignment (toe) of the wheels.
Click here
|
Proceed to |
|---|
|
NEXT |
|
|
5. |
ADJUST MILLIMETER WAVE RADAR SENSOR ASSEMBLY |
(a) Perform millimeter wave radar sensor assembly adjustment.
Click here
|
Proceed to |
|---|
|
NEXT |
|
|
6. |
CHECK FOR DTCs (RADAR CRUISE 2) |
(a) Clear the DTCs.
Click here
(b) Perform the following to make sure that the DTC detection conditions are met.
HINT:
If the following conditions are not met, the system cannot detect the malfunction.
- Turn the ignition switch to ON.
- Turn the dynamic radar cruise control system on using the cruise control main switch (ON-OFF button).
- Drive the vehicle at 36 km/h (22 mph) or more for 1 second 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 DEFECTIVE) |
| B |
|
|
7. |
CHECK MILLIMETER WAVE RADAR SENSOR ASSEMBLY |
(a) Check that the bracket of the millimeter wave radar sensor assembly is not deformed.
Click here
HINT:
If the bracket is deformed, replace the millimeter wave radar sensor assembly.
|
Result |
Proceed to |
|---|---|
|
Bracket is not deformed |
A |
|
Bracket is deformed |
B |
| B |
|
|
|
8. |
ADJUST MILLIMETER WAVE RADAR SENSOR ASSEMBLY |
(a) Perform millimeter wave radar sensor assembly adjustment.
Click here
|
Proceed to |
|---|
|
NEXT |
|
|
9. |
CHECK FOR DTCs (RADAR CRUISE 2) |
(a) Clear the DTCs.
Click here
(b) Perform the following to make sure that the DTC detection conditions are met.
HINT:
If the following conditions are not met, the system cannot detect the malfunction.
- Turn the ignition switch to ON.
- Turn the dynamic radar cruise control system on using the cruise control main switch (ON-OFF button).
- Drive the vehicle at 36 km/h (22 mph) or more for 1 second 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 DEFECTIVE) |
| B |
|
|
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
(c) Clear the DTCs.
Click here
|
Proceed to |
|---|
|
NEXT |
| NEXT |
|
END |
|
11. |
ADJUST MILLIMETER WAVE RADAR SENSOR ASSEMBLY |
(a) Perform millimeter wave radar sensor assembly adjustment.
Click here
|
Proceed to |
|---|
|
NEXT |
|
|
12. |
CHECK FOR DTCs (RADAR CRUISE 2) |
(a) Clear the DTCs.
Click here
(b) Perform the following to make sure that the DTC detection conditions are met.
HINT:
If the following conditions are not met, the system cannot detect the malfunction.
- Turn the ignition switch to ON.
- Turn the dynamic radar cruise control system on using the cruise control main switch (ON-OFF button).
- Drive the vehicle at 36 km/h (22 mph) or more for 1 second or more.
(c) Check for DTCs.
Click here
|
Result |
Proceed to |
|---|---|
|
DTC C1A14 is not output |
A |
|
DTC C1A14 is output |
B |
| A |
|
END (MILLIMETER WAVE RADAR SENSOR ASSEMBLY WAS DEFECTIVE) |
| B |
|
|
13. |
CLEAR DTC |
(a) Check for DTCs related to misalignment of millimeter wave radar sensor assembly.
(b) Clear the DTCs.
Click here
|
Proceed to |
|---|
|
NEXT |
| NEXT |
|
END |
|
|