- No. 1 ultrasonic sensor (front sensor) circuit
- Clearance warning ECU
| Last Modified: 04-05-2023 | 6.11:8.1.0 | Doc ID: RM1000000019042 |
| Model Year Start: 2018 | Model: Sienna | Prod Date Range: [11/2017 - ] |
| Title: PARK ASSIST / MONITORING: INTUITIVE PARKING ASSIST SYSTEM: C1AEC; Front Sensor Communication Malfunction; 2018 - 2020 MY Sienna [11/2017 - ] | ||
|
DTC |
C1AEC |
Front Sensor Communication Malfunction |
DESCRIPTION
This DTC is stored when there is an open or short circuit in the communication line between the No. 1 ultrasonic sensors (front sensor) and the ECU, or when there is a malfunction in a No. 1 ultrasonic sensor (front sensor).
|
DTC Code |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
C1AEC |
An open or short circuit in the No. 1 ultrasonic sensors (front sensor) and ECU or a malfunction in a No. 1 ultrasonic sensor (front sensor) during initialization mode after the ignition switch is turned to ON. |
|
WIRING DIAGRAM
PROCEDURE
|
1. |
CHECK DTC OUTPUT |
(a) Clear the DTCs.
Click here
![2016 - 2020 MY Sienna [12/2015 - ]; PARK ASSIST / MONITORING: INTUITIVE PARKING ASSIST SYSTEM: DTC CHECK / CLEAR](/t3Portal/stylegraphics/info.gif)
(b) Check for DTCs.
Click here
Result
|
Result |
Proceed to |
|---|---|
|
DTC C1AEC is output |
A |
|
No DTC is output |
B |
| B |
|
|
|
2. |
CHECK HARNESS AND CONNECTOR (NO. 1 ULTRASONIC SENSOR (FRONT LEFT SENSOR) - CLEARANCE WARNING ECU) |
(a) Disconnect the A79 No. 1 ultrasonic sensor (front left sensor) connector.
(b) Disconnect the D200 clearance warning ECU connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A79-1 (BI) - D200-4 (BOF) |
Always |
Below 1 Ω |
|
A79-3 (SI) - D200-8 (SOF) |
Always |
Below 1 Ω |
|
A79-5 (EI) - D200-6 (E5) |
Always |
Below 1 Ω |
|
A79-1 (BI) or D200-4 (BOF) - Body ground |
Always |
10 kΩ or higher |
|
A79-3 (SI) or D200-8 (SOF) - Body ground |
Always |
10 kΩ or higher |
|
A79-5 (EI) or D200-6 (E5) - Body ground |
Always |
10 kΩ or higher |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
3. |
CHECK HARNESS AND CONNECTOR (NO. 1 ULTRASONIC SENSOR (FRONT LEFT SENSOR) - NO. 1 ULTRASONIC SENSOR (FRONT RIGHT SENSOR)) |
(a) Disconnect the A78 No. 1 ultrasonic sensor (front right sensor) and A79 No. 1 ultrasonic sensor (front left sensor) connectors.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A79-2 (BO) - A78-1 (BI) |
Always |
Below 1 Ω |
|
A79-4 (SO) - A78-3 (SI) |
Always |
Below 1 Ω |
|
A79-6 (EO) - A78-5 (EI) |
Always |
Below 1 Ω |
|
A79-2 (BO) or A78-1 (BI) - Body ground |
Always |
10 kΩ or higher |
|
A79-4 (SO) or A78-3 (SI) - Body ground |
Always |
10 kΩ or higher |
|
A79-6 (EO) or A78-5 (EI) - Body ground |
Always |
10 kΩ or higher |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
4. |
INSPECT NO. 1 ULTRASONIC SENSOR (FRONT LEFT SENSOR) |
(a) Remove the No. 1 ultrasonic sensor (front left sensor).
Click here
(b) Inspect the No. 1 ultrasonic sensor (front left sensor).
Click here
| NG |
|
|
|
5. |
INSPECT NO. 1 ULTRASONIC SENSOR (FRONT RIGHT SENSOR) |
(a) Remove the No. 1 ultrasonic sensor (front right sensor).
Click here
(b) Inspect the No. 1 ultrasonic sensor (front right sensor).
Click here
| NG |
|
|
|
6. |
REPLACE NO. 1 ULTRASONIC SENSOR (FRONT LEFT SENSOR) |
(a) Replace the No. 1 ultrasonic sensor (front left sensor).
Click here
|
|
7. |
CHECK DTC OUTPUT |
(a) Clear the DTCs.
Click here
(b) Check for DTCs.
Click here
Result
|
Result |
Proceed to |
|---|---|
|
DTC C1AEC is output |
A |
|
No DTC is output |
B |
| B |
|
END (NO. 1 ULTRASONIC SENSOR (FRONT LEFT SENSOR) IS DEFECTIVE) |
|
|
8. |
REPLACE NO. 1 ULTRASONIC SENSOR (FRONT RIGHT SENSOR) |
(a) Replace the No. 1 ultrasonic sensor (front right sensor).
Click here
|
|
9. |
CHECK DTC OUTPUT |
(a) Clear the DTCs.
Click here
(b) Check for DTCs.
Click here
Result
|
Result |
Proceed to |
|---|---|
|
DTC C1AEC is output |
A |
|
No DTC is output |
B |
| A |
|
| B |
|
END (NO. 1 ULTRASONIC SENSOR (FRONT RIGHT SENSOR) WAS DEFECTIVE) |
|
|