Hyundai Elantra (CN7): Advanced Driver Assistance System (ADAS) / Parking Distance Warning (PDW)

Hyundai Elantra (CN7) 2021-2025 Service Manual / Advanced Driver Assistance System (ADAS) / Parking Distance Warning (PDW)

Description and operation

Description

•	PDW consists of 8 sensors (front : 4 units, rear : 4 units) that are used to detect obstacles and transmit the result in three separate warning levels, the first, second and third to IBU via LIN communication.

•	IBU decides the alarm level by the transmitted communication message from the slave sensors, then operates the buzzer or transmits the data for display.

Block Diagram

System Operation Specification

Initial mode

System initializing time

–	PDW-F : 500ms after IGN1+ initial D Gear + below 10 Km/h

–	PDW-R : 500ms after IGN1+ initial R Gear

2.	PDW recognizes LID and sets the sensor ID up during initialization.

3.	PDW activates each sensor and then executes the diagnosis after finishing initialization of IPM(IBU).

4.	PDW starting buzzer is normally worked, when sensor does not send an error message and after finishing error diagnosis.

If any failure is received from the any sensors, PDW starting buzzer does not work but the failure alarm is operated for a moment.

If you have display option, warning sign is also shown on it.

Buzzer for sensor failure is operated once, but display is shown continuously until it is repaired completely.

6.	IBU memorizes the completed initializing status of sensor.

Normal mode

1.	PDW-F : Lin communication starts and keeps the routine after IGN1 ON+D gear + below 10 km/h. PDW-R : Lin communication starts and keeps the routine after IGN1 ON+R gear

2.	After initializing, the routine starts at once without PDW starting warning sound.

3.	Alarms of obstacle consists of 3 level 1,2,3 step and 1,2 alarm sounds intermittently and 3 alarm sounds continuously. 1 level alarm doesn't exist in the front ultrasonic sensor.

4.	In display, the data of each sensor is sent from IBU to display, for example cluster. CAN communication is used for transmission and maximum gateway time is 50ms.

5.	The efficient vehicle speed of PDW operation is under 10Km/h.

6.	Operation doesn't start or stops at gear N, P.

Sensing Area

Level	Distance range	Allowed range
1	Front : 61 - 100 cm (24.02 - 39.37 in.) / Rear : 61 - 120 cm (24.02 - 47.2 in.)	± 15 cm (5.90 in.)
2	31 - 60 cm (12.20 - 23.62 in.)	± 15 cm (5.90 in.)
3	0 - 30 cm (0 - 11.81 in)	± 10 cm (3.94 in.)

*Measurement condition : PVC pipe - Diameter 75 mm (0.0394 in.), length 1 m (39.37 in.), at normal temperature

Display Alarm Indicator Specification

Components and components location

Component Location

1. Integrated body control unit (IBU)

2. Ultrasonic sensor

Specifications

Item		Specification
Ultrasonic sensor	Voltage rating	DC 12 V
	Detecting range	11.8 - 47.2 in. (30 - 120 cm)
	Operation voltage	DC 9 - 16 V
	Operation current	MAX 350 mA
	Operation temperature	-22 - 176°F (-30 - 80°C)
	Operation frequency	48 ± 5 KHz
	Number of sensors	8 units

Parking Distance Warning (PDW) Sensor

Schematic diagrams

Circuit Diagram

Repair procedures

Removal

1.	Remove the bumper cover. (Refer to Body - "Front Bumper Cover") (Refer to Body - "Rear Bumper Cover")

2.	Disconnect the ultrasonic sensor connector (A) and remove the ultrasonic sensor (B).

Installation

1.	Install the ultrasonic sensor.

2.	Install the bumper cover.

❮Warning Indicator

Components and components location Components1. BSD Indicator2. Side repeater lamp Repair procedures Inspection1.Disconnect the negative (-) battery terminal.

Rear View Monitor (RVM)❯

Description and operation DescriptionRear view camera will activate when the backup light is ON with the ignition switch ON and the shift lever in the R position.

Other information:

Hyundai Elantra (CN7) 2021-2025 Service Manual: A/C Pressure Transducer

Description and operation DescriptionThe A/C Pressure Transducer (APT) converts the pressure value of high pressure line into voltage value after measuring it. By converted voltage value, engine ECU controls the cooling fan by operating it high speed or low speed.