- No. 1 ultrasonic sensor (front sensor) circuit
- Clearance warning ECU
| Last Modified: 04-05-2023 | 6.11:8.1.0 | Doc ID: RM100000000VJA8 |
| Model Year Start: 2016 | Model: Sienna | Prod Date Range: [12/2015 - 11/2017] |
| Title: PARK ASSIST / MONITORING: INTUITIVE PARKING ASSIST SYSTEM: C1AEC; Front Sensor Communication Malfunction; 2016 - 2017 MY Sienna [12/2015 - 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 (See page
![2016 - 2020 MY Sienna [12/2015 - ]; PARK ASSIST / MONITORING: INTUITIVE PARKING ASSIST SYSTEM: DTC CHECK / CLEAR](/t3Portal/stylegraphics/info.gif)
).
(b) Check for DTCs (See page
).
Result
|
Result |
Proceed to |
|---|---|
|
DTC C1AEC is output |
A |
|
No DTC is output |
B |
| B |
|
USE SIMULATION METHOD TO CHECK (See page
|
|
|
2. |
INSPECT CLEARANCE WARNING ECU |
(a) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
D77-21 (BOF) - Body ground |
Ignition switch ON |
7.2 to 8.8 V |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
D77-19 (E1) - Body ground |
Always |
Below 1 Ω |
Text in Illustration
|
*a |
Component with harness connected (Clearance Warning ECU) |
| NG |
|
|
|
3. |
CHECK HARNESS AND CONNECTOR (NO. 1 ULTRASONIC SENSOR (FRONT LEFT SENSOR) - CLEARANCE WARNING ECU) |
(a) Disconnect the A41 No. 1 ultrasonic sensor (front left sensor) connector.
(b) Disconnect the D77 clearance warning ECU connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A41-1 (BI) - D77-21 (BOF) |
Always |
Below 1 Ω |
|
A41-3 (SI) - D77-9 (SOF) |
Always |
Below 1 Ω |
|
A41-5 (EI) - D77-19 (EI) |
Always |
Below 1 Ω |
|
A41-1 (BI) - Body ground |
Always |
10 kΩ or higher |
|
A41-3 (SI) - Body ground |
Always |
10 kΩ or higher |
|
A41-5 (EI) - Body ground |
Always |
10 kΩ or higher |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
4. |
CHECK HARNESS AND CONNECTOR (NO. 1 ULTRASONIC SENSOR (FRONT LEFT SENSOR) - NO. 1 ULTRASONIC SENSOR (FRONT RIGHT SENSOR)) |
(a) Disconnect the A40 No. 1 ultrasonic sensor (front right sensor) and A41 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 |
|---|---|---|
|
A41-2 (BO) - A40-1 (BI) |
Always |
Below 1 Ω |
|
A41-4 (SO) - A40-3 (SI) |
Always |
Below 1 Ω |
|
A41-6 (EO) - A40-5 (EI) |
Always |
Below 1 Ω |
|
A41-2 (BO) - Body ground |
Always |
10 kΩ or higher |
|
A41-4 (SO) - Body ground |
Always |
10 kΩ or higher |
|
A41-6 (EO) - Body ground |
Always |
10 kΩ or higher |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
5. |
CHECK DTC OUTPUT |
(a) Clear the DTCs (See page
).
(b) Check for DTCs (See page
).
Result
|
Result |
Proceed to |
|---|---|
|
DTC C1AEC is output and multi-information display indicates open circuit (Front Left and Front Right) |
A |
|
No DTC is output |
B |
| B |
|
USE SIMULATION METHOD TO CHECK (See page
|
|
|
6. |
REPLACE NO. 1 ULTRASONIC SENSOR (FRONT LEFT SENSOR) |
(a) Replace the No. 1 ultrasonic sensor (front left sensor) with a normally functioning sensor (See page
).
|
|
7. |
CHECK DTC OUTPUT |
(a) Clear the DTCs (See page
).
(b) Check for DTCs (See page
).
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) with a normally functioning sensor (See page
).
|
|
9. |
CHECK DTC OUTPUT |
(a) Clear the DTCs (See page
).
(b) Check for DTCs (See page
).
Result
|
Result |
Proceed to |
|---|---|
|
DTC C1AEC is output |
A |
|
No DTC is output |
B |
| A |
|
| B |
|
END (NO. 1 ULTRASONIC SENSOR (FRONT RIGHT SENSOR) IS DEFECTIVE) |
|
|