Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Ultrasonic Sensor (Front Left Corner) Missing Message (C1AE187)

DESCRIPTION

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

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C1AE187

Ultrasonic Sensor (Front Left Corner) Missing Message

Front corner ultrasonic sensor (FL sensor) lost communication

  • Front corner ultrasonic sensor (FL sensor)
  • Harness or connector
  • Clearance warning ECU assembly

WIRING DIAGRAM

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.

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 front corner ultrasonic sensor and front 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

C1AE187 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

C1AE187, C1AE287, C1AE387 and C1AE487 are output

B

C1AE287, C1AE387 and C1AE487 are output

C

C1AE387 and C1AE487 are output

D

C1AE487 is output

E

Only C1AE187 is output

F

None of the above conditions are met

G

A

USE SIMULATION METHOD TO CHECK

C

GO TO DTC (C1AE287)

D

GO TO DTC (C1AE387)

E

GO TO DTC (C1AE487)

F

GO TO STEP 9

G

GO TO DTC CHART

B

8.

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

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

(b) Disconnect the B9 front corner ultrasonic sensor (FL sensor) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I24-2 (BOF) - B9-4 (BI)

Always

Below 1 Ω

I24-4 (SOF) - B9-5 (SI)

Always

Below 1 Ω

I24-3 (E5) - B9-6 (EI)

Always

Below 1 Ω

I24-2 (BOF) or B9-4 (BI) - Body ground

Always

10 kΩ or higher

I24-4 (SOF) or B9-5 (SI) - Body ground

Always

10 kΩ or higher

I24-3 (E5) or B9-6 (EI) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

9.

REPLACE FRONT CORNER ULTRASONIC SENSOR (FL SENSOR)

(a) Replace the front corner ultrasonic sensor (FL 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

10.

CLEAR DTC

(a) Clear the DTCs.

Body Electrical > Clearance Warning > Clear DTCs
NEXT

11.

CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Clearance Warning > Trouble Codes

Result

Proceed to

DTCs are not output

A

C1AE187 is output

B

None of the above conditions are met

C

A

END (FRONT CORNER ULTRASONIC SENSOR [FL SENSOR] WAS DEFECTIVE)

B

REPLACE CLEARANCE WARNING ECU ASSEMBLY

C

GO TO DTC CHART

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