| Last Modified: 09-10-2025 | 6.11:8.1.0 | Doc ID: RM100000001AOP0 |
| Model Year Start: 2019 | Model: Avalon | Prod Date Range: [04/2018 - 08/2021] |
| Title: CRUISE CONTROL: LANE DEPARTURE ALERT SYSTEM (w/ Steering Control) (for Gasoline Model): C1A72; Communication Error from FCM to Driving Support ECU; 2019 - 2021 MY Avalon [04/2018 - 08/2021] | ||
|
DTC |
C1A72 |
Communication Error from FCM to Driving Support ECU |
DESCRIPTION
If a communication error between the driving support ECU assembly and forward recognition camera is detected, DTC C1A72 is stored.
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
|---|---|---|---|
|
C1A72 |
Communication Error from FCM to Driving Support ECU |
2 seconds after the engine switch is turned on (IG), a communication error between the driving support ECU assembly and the forward recognition camera is detected. |
|
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.
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![2019 - 2021 MY Avalon Avalon HV [04/2018 - 08/2021]; CRUISE CONTROL: FRONT CAMERA: ADJUSTMENT (SEQUENTIAL RECOGNITION)](/t3Portal/stylegraphics/info.gif)
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The lane departure alert system (w/ steering control) uses the CAN communication system. First, confirm that there are no malfunctions in the CAN communication system. Refer to How to Proceed with Troubleshooting.
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PROCEDURE
PROCEDURE
|
1. |
CHECK FOR DTCs |
HINT:
Confirm that there is no communication error between the forward recognition camera and driving support ECU assembly.
(a) Check for DTCs.
Body Electrical > Pre-Collision 2 > Trouble Codes
|
Result |
Proceed to |
|---|---|
|
DTC U023A is not output |
A |
|
DTC U023A is output |
B |
| B |
|
|
|
2. |
CHECK FOR DTCs |
(a) Clear the DTCs.
Chassis > LKA/LDA > 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.
Chassis > LKA/LDA > Trouble Codes
|
Result |
Proceed to |
|---|---|
|
DTC C1A72 is not output |
A |
|
DTC C1A72 is output |
B |
| A |
|
| B |
|
|
|