Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Ultrasonic Sensor (Front Left Center) Missing Message (C1AE287)

DESCRIPTION

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

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C1AE287

Ultrasonic Sensor (Front Left Center) Missing Message

Front center ultrasonic sensor (FLC sensor) lost communication

  • Front center ultrasonic sensor (FLC 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.

CHECK DTC

(a) If DTC C1AE196 is output, perform troubleshooting for DTC C1AE196 first.

Body Electrical > Clearance Warning > Trouble Codes

Result

Proceed to

C1AE196 is not output

A

C1AE196 is output

B

B

GO TO C1AE196

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 front corner ultrasonic sensor and front 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

C1AE287 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

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 C1AE287 is output

F

None of the above conditions are met

G

A

USE SIMULATION METHOD TO CHECK

B

GO TO DTC (C1AE187)

D

GO TO DTC (C1AE387)

E

GO TO DTC (C1AE487)

F

GO TO STEP 10

G

GO TO DTC CHART

C

9.

CHECK HARNESS AND CONNECTOR (FRONT CORNER ULTRASONIC SENSOR [FL SENSOR] - FRONT CENTER ULTRASONIC SENSOR [FLC SENSOR])

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

(b) Disconnect the B10 front center ultrasonic sensor (FLC sensor) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

B9-1 (BO) - B10-4 (BI)

Always

Below 1 Ω

B9-2 (SO) - B10-5 (SI)

Always

Below 1 Ω

B9-3 (EO) - B10-6 (EI)

Always

Below 1 Ω

B9-1 (BO) or B10-4 (BI) - Body ground

Always

10 kΩ or higher

B9-2 (SO) or B10-5 (SI) - Body ground

Always

10 kΩ or higher

B9-3 (EO) or B10-6 (EI) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

10.

REPLACE FRONT CENTER ULTRASONIC SENSOR (FLC SENSOR)

(a) Replace the front center ultrasonic sensor (FLC 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

C1AE287 is output

B

None of the above conditions are met

C

A

END (FRONT CENTER ULTRASONIC SENSOR [FLC SENSOR] WAS DEFECTIVE)

B

REPLACE CLEARANCE WARNING ECU ASSEMBLY

C

GO TO DTC CHART

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