Last Modified: 07-31-2024 6.11:8.1.0 Doc ID: RM100000002D8AJ
Model Year Start: 2024 Model: GR Corolla Prod Date Range: [08/2023 -           ]
Title: PARK ASSIST / MONITORING: INTUITIVE PARKING ASSIST SYSTEM: C1AE687; Ultrasonic Sensor (Rear Left Corner) Missing Message; 2024 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [08/2023 -        ]

DTC

C1AE687

Ultrasonic Sensor (Rear Left Corner) Missing Message

DESCRIPTION

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

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

DTC Output from

Priority

C1AE687

Ultrasonic Sensor (Rear Left Corner) Missing Message

Rear corner ultrasonic sensor LH lost communication
  • Rear 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 rear corner ultrasonic sensor and rear 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

C1AE687 is not output

A

C1AE687 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

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

C1AE687 is output

F
A

USE SIMULATION METHOD TO CHECK

C

GO TO CORRESPONDING FLOWCHART (INTUITIVE PARKING ASSIST SYSTEM (C1AE787))

D

GO TO CORRESPONDING FLOWCHART (INTUITIVE PARKING ASSIST SYSTEM (C1AE887))

E

GO TO CORRESPONDING FLOWCHART (INTUITIVE PARKING ASSIST SYSTEM (C1AE987))

F

GO TO STEP 8

B

7.

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

Pre-procedure1

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

(b) Disconnect the P1 rear 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

I24-19 (BOR) - P1-4 (BI)

Always

Below 1 Ω

I24-21 (SOR) - P1-5 (SI)

Always

Below 1 Ω

I24-20 (E1) - P1-6 (EI)

Always

Below 1 Ω

I24-19 (BOR) or P1-4 (BI) - Body ground

Always

10 kΩ or higher

I24-21 (SOR) or P1-5 (SI) - Body ground

Always

10 kΩ or higher

I24-20 (E1) or P1-6 (EI) - Body ground

Always

10 kΩ or higher

Post-procedure1

(d) None

NG

REPAIR OR REPLACE WIRE HARNESS OR CONNECTOR
OK

8.

REPLACE REAR CORNER ULTRASONIC SENSOR LH

(a) Replace the rear 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 Rear 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

C1AE687 is output

B
A

END (REAR CORNER ULTRASONIC SENSOR LH WAS DEFECTIVE)
B

REPLACE CLEARANCE WARNING ECU ASSEMBLY