Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000002D8AB
Model Year Start: 2024 Model: GR Corolla Prod Date Range: [08/2023 -           ]
Title: PARK ASSIST / MONITORING: INTUITIVE PARKING ASSIST SYSTEM: C1AE187; Ultrasonic Sensor (Front Left Corner) Missing Message; 2024 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [08/2023 -        ]

DTC

C1AE187

Ultrasonic Sensor (Front Left Corner) Missing Message

DESCRIPTION

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

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

DTC Output from

Priority

C1AE187

Ultrasonic Sensor (Front Left Corner) Missing Message

Front corner ultrasonic sensor LH lost communication
  • Front corner ultrasonic sensor LH
  • Harness or connector
  • Clearance warning ECU assembly

Clearance Warning

B

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

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

    Click here 2024 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [08/2023 -        ]; PARK ASSIST / MONITORING: INTUITIVE PARKING ASSIST SYSTEM: CALIBRATION

  • 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.

CHECK FOR DTC

(a) According to the display on the GTS, check for DTCs.

Body Electrical > Clearance Warning > Trouble Codes

(b) According to the display on the GTS, clear the DTCs.

Body Electrical > Clearance Warning > Clear DTCs

(c) Recheck for DTCs.

Body Electrical > Clearance Warning > Trouble Codes

Result

Proceed to

C1AE187 is not output

A

C1AE187 is output

B
A

END (CONNECTOR CONNECTION MALFUNCTION)
B

4.

CHECK CONNECTOR CONNECTION CONDITION (CLEARANCE WARNING ECU ASSEMBLY)

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

NEXT

5.

CLEAR DTC

(a) Clear the DTCs.

Body Electrical > Clearance Warning > Clear DTCs

NEXT

6.

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

C1AE187 is output

F
A

USE SIMULATION METHOD TO CHECK

C

GO TO CORRESPONDING FLOWCHART (INTUITIVE PARKING ASSIST SYSTEM (C1AE287))

D

GO TO CORRESPONDING FLOWCHART (INTUITIVE PARKING ASSIST SYSTEM (C1AE387))

E

GO TO CORRESPONDING FLOWCHART (INTUITIVE PARKING ASSIST SYSTEM (C1AE487))

F

GO TO STEP 8

B

7.

CHECK WIRE HARNESS AND CONNECTOR (CLEARANCE WARNING ECU ASSEMBLY - FRONT CORNER ULTRASONIC SENSOR LH)

Pre-procedure1

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

(b) Disconnect the B1 front corner ultrasonic sensor LH connector.

Procedure1

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I24-2 (BOF) - B1-4 (BI)

Always

Below 1 Ω

I24-4 (SOF) - B1-5 (SI)

Always

Below 1 Ω

I24-3 (E5) - B1-6 (EI)

Always

Below 1 Ω

I24-2 (BOF) or B1-4 (BI) - Body ground

Always

10 kΩ or higher

I24-4 (SOF) or B1-5 (SI) - Body ground

Always

10 kΩ or higher

I24-3 (E5) or B1-6 (EI) - Body ground

Always

10 kΩ or higher

Post-procedure1

(d) None

NG

REPAIR OR REPLACE WIRE HARNESS OR CONNECTOR
OK

8.

REPLACE FRONT CORNER ULTRASONIC SENSOR LH

(a) Replace the front corner ultrasonic sensor LH with a new or normally functioning one.

HINT:

  • Click here 2024 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [08/2023 -        ]; PARK ASSIST / MONITORING: ULTRASONIC SENSOR (for Front Side): REMOVAL
  • To check if the ultrasonic sensor is functioning correctly, replace it with another ultrasonic sensor.
NEXT

9.

CLEAR DTC

(a) Clear the DTCs.

Body Electrical > Clearance Warning > Clear DTCs

NEXT

10.

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
A

END (FRONT CORNER ULTRASONIC SENSOR LH WAS DEFECTIVE)
B

REPLACE CLEARANCE WARNING ECU ASSEMBLY