Hyundai Elantra: Parking Distance Warning (PDW) / Description and operation
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| 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. |
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| 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
1. | 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. |
5. | 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. |
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6. | IBU memorizes the completed initializing status of sensor. |
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

Component Location1. Integrated body control unit (IBU) 2. Ultrasonic sensor..
Other information:
Components and components location
Component Location 1. Rear package tray trim
Repair procedures
Replacement
•
When removing with a flat - tip screwdriver or remover, wrap protective tape around the tools to prevent damage to components. •
Put on gloves to prevent hand injuries.
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