Hyundai Ioniq: Rear Corner Radar System / Rear Corner Radar Unit. Repair procedures

Hyundai Ioniq (AE) 2017-2025 Service Manual / Advanced Driver Assistance System (ADAS) / Rear Corner Radar System / Rear Corner Radar Unit. Repair procedures

Removal

1.	Disconnect the negative (-) battery terminal.

2.	Remove the rear bumper. (Refer to Body - "Rear Bumper")

Remove the rear corner radar unit (A) after loosening the mounting nuts.

•	Take care not to separate the bracket from rear bumper when removing the rear corner radar sensor.

Replace the bracket (A) when the bracket is physically changed or damaged.

•	Radar does not work normally if the bracket is physically changed or damaged.

5.	Replace the extension wiring (A) when it damaged.

Installation

Install the Rear corner radar unit and bracket.

Tightening torque :

Rear corner radar bracket : 3.9 - 5.9 N.m (0.4 - 0.6 kg cm, 2.9 - 4.4 lb-ft)

Rear corner radar unit : 2.5 N.m

2.	Install the rear bumper.

Connect the negative (-) battery terminal.

•	Take care not to confuse left side (master) and right side (slave) unit when installing.

•	Rear corner radar units connector connect to the wiring connector.

Inspection

Correction Overview

When you replace a rear corner radar bracket or rear corner radar components after a rear or side collision of a vehicle equipped with the rear corner radar system, you need to check if the mounting angle of the rear corner radar.

Check before Correction

1.	When a failure code [C2702 (Master)] or [C2703 (Slave)] occurs, check the following before performing correction.

Check the vehicle condition and whether the rear corner radar unit or bracket is deformed (mounting angle, twisted vehicle body, etc.).

Checking the Vehicle
Normal	Abnormal (deformation of the bracket or bolted area)

Checking the Vehicle
Normal	Abnormal (deformation of the bracket or bolted area)

Check the nut tightening. Check if there is any foreign substance.

Checking the Vehicle
Normal	Abnormal (deformation of the bracket or bolted area)

•	If you found any problem in the rear corner radar unit, bracket, or nut tightening, correct the problem or replace the component. If there is no problem, mount the bumper back and perform rear corner radar.

•	If a failure code is displayed or a warning lamp turns on even after performing rear corner radar radar correction 5 times, replace the rear corner radar unit.

Correcting the Rear Corner Radar Angle

After replacing the rear corner radar unit or bracket, with the bumper removed, use the rear corner radar unit correction tool set (special tool : 09985-3T500) to perform angle correction.

•	Perform the task on a level place.

•	Perform the task after checking the tire pressure.

•	For the dealer who purchased the existing rear corner radar correction tool set (09958-3T000), refer to the instructions of the 17MY shop manual and repair it.

2.	Attach a vertical plumb (special tool : 09958-3T010) on the hood, and lower the plumb (A) to the ground so that it passes through the center of the emblem.

3.	Marking the center point below the plumb (A).

4.	Attach a vertical plumb (special tool : 09958-3T010) on the trunk (or tailgate), and lower the plumb (A) to the ground so that it passes through the center of the emblem.

5.	Marking the center point below the plumb (A).

Marking the center of vehicle by a string.

1)	Pass the string through the bottom of the vehicle from the rear of the vehicle to the front and fix the string to the center point (A) of the front of the vehicle.

2)	Fix the string to the point (C) about 1.5 - 2m from the back of the vehicle so that it passes the rear center point (B).

Mount the rear corner radar unit fixing adaptor (special tool : 09958-3T080) on the rear corner radar unit and fix the level laser (special tool : 09958-3T070).

When with the rear corner radar unit cover, remove the cover and then mount the fixing adapter (special tool: 09958-3T080).

Measure the angle (C) between the center line (A) of the angle measuring plate and the horizontal laser beam (B) using a digital protractor (special tool : 09958-3T090).

Horizontal Angle (C) : 37° ± 2°

Use a digital inclinometer (special tool : 09958-3T100) to measure the vertical angle of the rear corner radar unit.

Vertical Angle : 90° ± 1°

10.

Measure the horizontal and vertical angles of left and right rear corner radar units. If the measured values deviate from the specified values, insert a washer between the bracket of the rear corner radar unit.

Specified Values

Horizontal Angle : 37° ± 2°

Vertical Angle : 90° ± 1°

11.	After checking and correcting the rear corner radar unit angle, perform the rear corner radar radar correction procedure.

rear corner radar Unit Alignment

1.	Rear bumper accident vehicles and vehicles that replaced rear corner radar units must perform rear corner radar unit alignment using GDS.

2.	Select "rear corner radar Radar Calibration" procedure in rear corner radar system.

3.	Perform the "rear corner radar Radar Calibration" procedure according to the GDS screen message.

Rear Corner Radar Unit. Schematic diagrams

Rear Corner Safety ON/OFF Switch. Components and components location

C..

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