- ECM
- Driving support ECU assembly
| Last Modified: 04-05-2023 | 6.11:8.1.0 | Doc ID: RM1000000018WRX |
| Model Year Start: 2018 | Model: Sienna | Prod Date Range: [11/2017 - ] |
| Title: CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: C1A52; Driving Support ECU Communication Abnormal; 2018 - 2020 MY Sienna [11/2017 - ] | ||
|
DTC |
C1A52 |
Driving Support ECU Communication Abnormal |
DESCRIPTION
DTC C1A52 is stored when the ECM cannot recognize the driving support ECU assembly.
|
DTC No. |
DTC Detection Condition |
Trouble Area |
MIL |
|---|---|---|---|
|
C1A52 |
Approximately 17 seconds after the ignition switch is ON, the ECM cannot recognize the driving support ECU assembly for approximately 1.3 seconds or more. |
|
Does not come on |
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.
PROCEDURE
|
1. |
CHECK FOR DTC (RADAR CRUISE 2) |
(a) Clear the DTCs.
Click here
![2018 - 2020 MY Sienna [11/2017 - ]; CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: DTC CHECK / CLEAR](/t3Portal/stylegraphics/info.gif)
(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.
- Wait for 20 seconds or more.
(c) Check for DTCs.
Click here
|
Result |
Proceed to |
|---|---|
|
DTC C1A52 is not output |
A |
|
DTC C1A52 is output |
B |
| A |
|
|
|
2. |
CHECK BUZZER |
(a) Replace the ECM.
Click here
|
Proceed to |
|---|
|
NEXT |
|
|
3. |
CHECK FOR DTC (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.
- Wait for 20 seconds or more.
(c) Check for DTCs.
Click here
|
Result |
Proceed to |
|---|---|
|
DTC C1A52 is not output |
A |
|
DTC C1A52 is output |
B |
| A |
|
END (ECM WAS DEFECTIVE) |
| B |
|
|
|