Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Ultrasonic Sensor (Rear Left Center) Missing Message (C1AE787)

Toyota Corolla Cross (2022-2024) Service Manual / Audio & Visual & Telematics / Park Assist / Monitoring / Intuitive Parking Assist System / 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
  • Rear center ultrasonic sensor (RLC sensor)
  • Harness or connector
  • Clearance warning ECU assembly

WIRING DIAGRAM

for HEV Model

for Gasoline Model

CAUTION / NOTICE / HINT

NOTICE:

  • Perform registration after replacing or removing and installing the ultrasonic sensor or clearance warning ECU assembly.

    Click here

  • 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

GO TO C1AE696

A

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

A

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.

NEXT

4.

CLEAR DTC

(a) Clear the DTCs.

Body Electrical > Clearance Warning > Clear DTCs
NEXT

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

B

6.

CHECK CONNECTOR CONNECTION CONDITION (CLEARANCE WARNING ECU ASSEMBLY)

(a) Check that the connector is properly connected to the clearance warning ECU assembly.

NEXT

7.

CLEAR DTC

(a) Clear the DTCs.

Body Electrical > Clearance Warning > Clear DTCs
NEXT

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

C

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

A

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
OK

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.
NEXT

12.

CLEAR DTC

(a) Clear the DTCs.

Body Electrical > Clearance Warning > Clear DTCs
NEXT

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

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