Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Ultrasonic Sensor (Rear Left Corner) Missing Message (C1AE687)

DESCRIPTION

This DTC is output when an open circuit or short occurs in the communication line between a rear corner ultrasonic sensor (RL sensor) and the clearance warning ECU assembly, or when a malfunction occurs in a rear corner ultrasonic sensor (RL sensor) on the rear.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C1AE687

Ultrasonic Sensor (Rear Left Corner) Missing Message

Rear corner ultrasonic sensor (RL sensor) lost communication

  • Rear corner ultrasonic sensor (RL 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.

    Click here

PROCEDURE

1.

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

2.

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

3.

CLEAR DTC

(a) Clear the DTCs.

Body Electrical > Clearance Warning > Clear DTCs
NEXT

4.

CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Clearance Warning > Trouble Codes

Result

Proceed to

DTCs are not output

A

C1AE687 is output

B

None of the above conditions are met

C

A

END (CONNECTOR CONNECTION MALFUNCTION)

C

GO TO DTC CHART

B

5.

CHECK CONNECTOR CONNECTION CONDITION (CLEARANCE WARNING ECU ASSEMBLY)

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

NEXT

6.

CLEAR DTC

(a) Clear the DTCs.

Body Electrical > Clearance Warning > Clear DTCs
NEXT

7.

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 C1AE687 is output

F

None of the above conditions are met

G

A

USE SIMULATION METHOD TO CHECK

C

GO TO DTC (C1AE787)

D

GO TO DTC (C1AE887)

E

GO TO DTC (C1AE987)

F

GO TO STEP 10

G

GO TO DTC CHART

B

8.

CONFIRM MODEL

(a) Choose the model to be inspected.

Result

Proceed to

for HEV Model

A

for Gasoline Model

B

B

GO TO STEP 13

A

9.

CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU ASSEMBLY - REAR CORNER ULTRASONIC SENSOR [RL SENSOR])

(a) Disconnect the I24 clearance warning ECU assembly connector.

(b) Disconnect the V4 rear corner ultrasonic sensor (RL sensor) connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

I24-19 (BOR) - V4-4 (BI)

Always

Below 1 Ω

I24-21 (SOR) - V4-5 (SI)

Always

Below 1 Ω

I24-20 (E1) - V4-6 (EI)

Always

Below 1 Ω

I24-19 (BOR) or V4-4 (BI) - Body ground

Always

10 kΩ or higher

I24-21 (SOR) or V4-5 (SI) - Body ground

Always

10 kΩ or higher

I24-20 (E1) or V4-6 (EI) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

10.

REPLACE REAR CORNER ULTRASONIC SENSOR (RL SENSOR)

(a) Replace the rear corner ultrasonic sensor (RL 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

11.

CLEAR DTC

(a) Clear the DTCs.

Body Electrical > Clearance Warning > Clear DTCs
NEXT

12.

CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Clearance Warning > Trouble Codes

Result

Proceed to

DTCs are not output

A

C1AE687 is output

B

None of the above conditions are met

C

A

END (REAR CORNER ULTRASONIC SENSOR [RL SENSOR] WAS DEFECTIVE)

B

REPLACE CLEARANCE WARNING ECU ASSEMBLY

C

GO TO DTC CHART

13.

CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU ASSEMBLY - REAR CORNER ULTRASONIC SENSOR [RL SENSOR])

(a) Disconnect the I24 clearance warning ECU assembly connector.

(b) Disconnect the R18 rear corner ultrasonic sensor (RL sensor) connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

I24-19 (BOR) - R18-4 (BI)

Always

Below 1 Ω

I24-21 (SOR) - R18-5 (SI)

Always

Below 1 Ω

I24-20 (E1) - R18-6 (EI)

Always

Below 1 Ω

I24-19 (BOR) or R18-4 (BI) - Body ground

Always

10 kΩ or higher

I24-21 (SOR) or R18-5 (SI) - Body ground

Always

10 kΩ or higher

I24-20 (E1) or R18-6 (EI) - Body ground

Always

10 kΩ or higher

OK

GO TO STEP 10

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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