DTC C1AE3-87: Ultrasonic Sensor (Front Right Center) Missing Message [02/2019 - 10/2023]: Procedure

1. Check the vehicle condition and work details.

   Result

   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

Result: 

B 

GO TO CALIBRATION. Refer to  CALIBRATION [02/2019 - 10/2022]  , or refer to  CALIBRATION [10/2022 - 10/2023] 

Result: 

A 

See step  2

1. Check that the connector is properly connected to the front corner ultrasonic sensor and front center ultrasonic sensor.

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  3

1. Clear the DTCs.

   Body Electrical > Clearance Warning > Clear DTCs 

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  4

1. Check for DTCs.

   Body Electrical > Clearance Warning > Trouble Codes 

   Result

   Result	Proceed to
   C1AE3-87 is not output	A
   C1AE3-87 is output	B

Result: 

A 

END (CONNECTOR CONNECTION MALFUNCTION) 

Result: 

B 

See step  5

1. Check that the connector is properly connected to the clearance warning ECU assembly.

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  6

1. Clear the DTCs.

   Body Electrical > Clearance Warning > Clear DTCs 

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  7

1. Recheck for DTCs.

   Refer to DTC CHECK / CLEAR [02/2019 - ]

   Body Electrical > Clearance Warning > Trouble Codes 

   DTC OUTPUT COMBINATION:
   
   

   Symptoms	DTC Detection
   	C1AE1-87	C1AE2-87	C1AE3-87	C1AE4-87
   Symptom 1	Not output	Not output	Not output	Not output
   Symptom 2	Not output	Not output	Not output	Output
   Symptom 3	Not output	Not output	Output	Output
   Symptom 4	Not output	Output	Output	Output
   Symptom 5	Output	Output	Output	Output

   Result

   Result	Proceed to
   Listed under symptom 1 in combination table	A
   Listed under symptom 2 in combination table	B
   Listed under symptom 3 in combination table	C
   Listed under symptom 4 in combination table	D
   Listed under symptom 5 in combination table	E
   Only C1AE3-87 is output	F

Result: 

A 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2018 - ] 

Result: 

B 

GO TO DTC (C1AE4-87). Refer to  DTC C1AE4-87: Ultrasonic Sensor (Front Right Corner) Missing Message [02/2019 - 10/2023]  

Result: 

D 

GO TO DTC (C1AE2-87). Refer to  DTC C1AE2-87: Ultrasonic Sensor (Front Left Center) Missing Message [02/2019 - 10/2023]  

Result: 

E 

GO TO DTC (C1AE1-87). Refer to  DTC C1AE1-87: Ultrasonic Sensor (Front Left Corner) Missing Message [02/2019 - 10/2023]  

Result: 

F 

See step  9

Result: 

C 

See step  8

1. Disconnect the B4 front center ultrasonic sensor (FLC sensor) connector.
2. Disconnect the B3 front center ultrasonic sensor (FRC sensor) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   B4-1 (BO) - B3-4 (BI)	Always	Below 1 Ω
   B4-2 (SO) - B3-5 (SI)	Always	Below 1 Ω
   B4-3 (EO) - B3-6 (EI)	Always	Below 1 Ω
   B4-1 (BO) or B3-4 (BI) - Body ground	Always	10 kΩ or higher
   B4-2 (SO) or B3-5 (SI) - Body ground	Always	10 kΩ or higher
   B4-3 (EO) or B3-6 (EI) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  9

1. Replace the front center ultrasonic sensor (FRC sensor) with a known good one.

   Refer to REMOVAL [02/2019 - 08/2020] , or refer to REMOVAL [08/2020 - 10/2023]

   HINT: 

   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.

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  10

1. Check for DTCs.

   Refer to DTC CHECK / CLEAR [02/2019 - ]

   Body Electrical > Clearance Warning > Trouble Codes 

2. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [02/2019 - ]

   Body Electrical > Clearance Warning > Clear DTCs 

3. Recheck for DTCs.

   Refer to DTC CHECK / CLEAR [02/2019 - ]

   Body Electrical > Clearance Warning > Trouble Codes 

   Result

   Result	Proceed to
   DTC C1AE3-87 is not output	A
   DTC C1AE3-87 is output	B

Result: 

A 

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

Result: 

B 

REPLACE CLEARANCE WARNING ECU ASSEMBLY. Refer to  REMOVAL [02/2019 - ]