DTC C1AF1-87: Ultrasonic Sensor (Rear Left Side) Missing Message [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 [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
   C1AF1-87 is not output	A
   C1AF1-87 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. Check for DTCs.

   Body Electrical > Clearance Warning > Trouble Codes 

   Result

   Result	Proceed to
   C1AF1-87 is not output	A
   C1AF1-87 is output	B
   C1AF1-87 and C1AF2-87 are output	C

Result: 

A 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2023 - ] 

Result: 

C 

GO TO DTC (C1AF2-87). Refer to  DTC C1AF2-87: Ultrasonic Sensor (Rear Right Side) Missing Message [10/2023 - ]  

Result: 

B 

See step  8

1. Disconnect the O10 rear side ultrasonic sensor (RRS sensor) connector.
2. Disconnect the O11 rear side ultrasonic sensor (RLS sensor) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   O10-1 (BO) - O11-4 (BI)	Always	Below 1 Ω
   O10-2 (SO) - O11-5 (SI)	Always	Below 1 Ω
   O10-3 (EO) - O11-6 (EI)	Always	Below 1 Ω
   O10-1 (BO) or O11-4 (BI) - Body ground	Always	10 kΩ or higher
   O10-2 (SO) or O11-5 (SI) - Body ground	Always	10 kΩ or higher
   O10-3 (EO) or O11-6 (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 rear side ultrasonic sensor (RLS sensor) with a known good one.

   Refer to REMOVAL [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. Clear the DTCs.

   Body Electrical > Clearance Warning > Clear DTCs 

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  11

1. Check for DTCs.

   Body Electrical > Clearance Warning > Trouble Codes 

   Result

   Result	Proceed to
   C1AF1-87 is not output	A
   C1AF1-87 is output	B

Result: 

A 

END (REAR SIDE ULTRASONIC SENSOR [RLS SENSOR] WAS DEFECTIVE) 

Result: 

B 

REPLACE CLEARANCE WARNING ECU ASSEMBLY. Refer to  REMOVAL [10/2023 - ]