Toyota Corolla Cross: Ultrasonic Sensor (Rear Left Center) Missing Message (C1AE787)
DESCRIPTION
This DTC is output when an open circuit or short occurs in the communication line between a rear center ultrasonic sensor (RLC sensor) and the rear corner ultrasonic sensor (RL sensor), or when a malfunction occurs in a rear center ultrasonic sensor (RLC sensor) on the rear.
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
|---|---|---|---|
|
C1AE787 |
Ultrasonic Sensor (Rear Left Center) Missing Message |
Rear center ultrasonic sensor (RLC sensor) lost communication |
|
WIRING DIAGRAM
for HEV Model
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for Gasoline Model
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CAUTION / NOTICE / HINT
NOTICE:
- Perform registration after replacing or removing and installing the
ultrasonic sensor or clearance warning ECU assembly.
Click here
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- If a DTC is detected again after the repair, turn the ignition switch to ON and turn the intuitive parking assist system on, and then clear the DTC.
PROCEDURE
|
1. |
CHECK DTC |
(a) If DTC C1AE696 is output, perform troubleshooting for DTC C1AE696 first.
Body Electrical > Clearance Warning > Trouble Codes|
Result |
Proceed to |
|---|---|
|
C1AE696 is not output |
A |
|
C1AE696 is output |
B |
| B | .gif)
|
GO TO C1AE696 |
|
.gif)
|
2. |
VEHICLE CONDITION AND WORK DETAILS CHECK |
(a) Check the vehicle condition and work details.
|
Result |
Proceed to |
|---|---|
|
The clearance warning ECU assembly or ultrasonic sensor has not been replaced |
A |
|
The clearance warning ECU assembly or ultrasonic sensor has been replaced |
B |
| B |
|
GO TO CALIBRATION |
|
|
3. |
CHECK CONNECTOR CONNECTION CONDITION (ULTRASONIC SENSOR) |
(a) Check that the connector is properly connected to the rear corner ultrasonic sensor and rear center ultrasonic sensor.
|
|
4. |
CLEAR DTC |
(a) Clear the DTCs.
Body Electrical > Clearance Warning > Clear DTCs
|
|
5. |
CHECK FOR DTC |
(a) Check for DTCs.
Body Electrical > Clearance Warning > Trouble Codes|
Result |
Proceed to |
|---|---|
|
DTCs are not output |
A |
|
C1AE787 is output |
B |
|
None of the above conditions are met |
C |
| A |
|
END (CONNECTOR CONNECTION MALFUNCTION) |
| C |
|
GO TO DTC CHART |
|
|
6. |
CHECK CONNECTOR CONNECTION CONDITION (CLEARANCE WARNING ECU ASSEMBLY) |
(a) Check that the connector is properly connected to the clearance warning ECU assembly.
|
|
7. |
CLEAR DTC |
(a) Clear the DTCs.
Body Electrical > Clearance Warning > Clear DTCs
|
|
8. |
CHECK FOR DTC |
(a) Check for DTCs.
Body Electrical > Clearance Warning > Trouble Codes|
Result |
Proceed to |
|---|---|
|
DTCs are not output |
A |
|
C1AE687, C1AE787, C1AE887 and C1AE987 are output |
B |
|
C1AE787, C1AE887 and C1AE987 are output |
C |
|
C1AE887 and C1AE987 are output |
D |
|
C1AE987 is output |
E |
|
Only C1AE787 is output |
F |
|
None of the above conditions are met |
G |
| A |
|
USE SIMULATION METHOD TO CHECK |
| B |
|
GO TO DTC (C1AE687) |
| D |
|
GO TO DTC (C1AE887) |
| E |
|
GO TO DTC (C1AE987) |
| F |
|
GO TO STEP 11 |
| G |
|
GO TO DTC CHART |
|
|
9. |
CONFIRM MODEL |
(a) Choose the model to be inspected.
|
Result |
Proceed to |
|---|---|
|
for HEV Model |
A |
|
for Gasoline Model |
B |
| B |
|
GO TO STEP 14 |
|
|
10. |
CHECK HARNESS AND CONNECTOR (REAR CORNER ULTRASONIC SENSOR [RL SENSOR] - REAR CENTER ULTRASONIC SENSOR [RLC SENSOR]) |
(a) Disconnect the V4 rear corner ultrasonic sensor (RL sensor) connector.
(b) Disconnect the V1 rear center ultrasonic sensor (RLC sensor) connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
V4-1 (BO) - V1-4 (BI) |
Always |
Below 1 Ω |
|
V4-2 (SO) - V1-5 (SI) |
Always |
Below 1 Ω |
|
V4-3 (EO) - V1-6 (EI) |
Always |
Below 1 Ω |
|
V4-1 (BO) or V1-4 (BI) - Body ground |
Always |
10 kΩ or higher |
|
V4-2 (SO) or V1-5 (SI) - Body ground |
Always |
10 kΩ or higher |
|
V4-3 (EO) or V1-6 (EI) - Body ground |
Always |
10 kΩ or higher |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
11. |
REPLACE REAR CENTER ULTRASONIC SENSOR (RLC SENSOR) |
(a) Replace the rear center ultrasonic sensor (RLC sensor) with a known good one.
HINT:
- Click here
- All of the sensors are interchangeable. To confirm whether a sensor is functioning normally, switch it with a known good sensor from the other end of the vehicle.
|
|
12. |
CLEAR DTC |
(a) Clear the DTCs.
Body Electrical > Clearance Warning > Clear DTCs
|
|
13. |
CHECK FOR DTC |
(a) Check for DTCs.
Body Electrical > Clearance Warning > Trouble Codes|
Result |
Proceed to |
|---|---|
|
DTCs are not output |
A |
|
C1AE787 is output |
B |
|
None of the above conditions are met |
C |
| A |
|
END (REAR CENTER ULTRASONIC SENSOR [RLC SENSOR] WAS DEFECTIVE) |
| B |
|
REPLACE CLEARANCE WARNING ECU ASSEMBLY |
| C |
|
GO TO DTC CHART |
|
14. |
CHECK HARNESS AND CONNECTOR (REAR CORNER ULTRASONIC SENSOR [RL SENSOR] - REAR CENTER ULTRASONIC SENSOR [RLC SENSOR]) |
(a) Disconnect the R18 rear corner ultrasonic sensor (RL sensor) connector.
(b) Disconnect the R15 rear center ultrasonic sensor (RLC sensor) connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
R18-1 (BO) - R15-4 (BI) |
Always |
Below 1 Ω |
|
R18-2 (SO) - R15-5 (SI) |
Always |
Below 1 Ω |
|
R18-3 (EO) - R15-6 (EI) |
Always |
Below 1 Ω |
|
R18-1 (BO) or R15-4 (BI) - Body ground |
Always |
10 kΩ or higher |
|
R18-2 (SO) or R15-5 (SI) - Body ground |
Always |
10 kΩ or higher |
|
R18-3 (EO) or R15-6 (EI) - Body ground |
Always |
10 kΩ or higher |
| OK |
|
GO TO STEP 11 |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
READ NEXT:
Ultrasonic Sensor (Rear Left Center) Component Internal Failure (C1AE796)
DESCRIPTION
The rear center ultrasonic sensor (RLC sensor) is installed
on the rear bumper. The clearance warning ECU assembly detects obstacles based on
signals it receives from the rear center
Ultrasonic Sensor (Rear Right Center) Missing Message (C1AE887)
DESCRIPTION
This DTC is output when an open circuit or short occurs in the
communication line between a rear center ultrasonic sensor (RRC sensor) and the
rear center ultrasonic sensor (RLC senso
Ultrasonic Sensor (Rear Right Center) Component Internal Failure (C1AE896)
DESCRIPTION
The rear center ultrasonic sensor (RRC sensor) is installed
on the rear bumper. The clearance warning ECU assembly detects obstacles based on
signals it receives from the rear center
SEE MORE:
Removal
REMOVAL CAUTION / NOTICE / HINT COMPONENTS (REMOVAL)
Procedure Part Name Code
1 PRECAUTION
-
- -
2 DISCONNECT CABLE FROM NEGATIVE AUXILIARY BATTERY TERMINAL
- -
- -
3 FRONT SEAT HEADREST ASSEMBLY
Front Door Courtesy Switch Circuit
DESCRIPTION The main body ECU (multiplex network body ECU) detects the condition of the front door courtesy light switch assembly. WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE: Before replacing the main body ECU (multiplex network body ECU), refer to Registration.*1
for HEV Model: Click here
