Hyundai Elantra: Blind Spot Detection System / Description and Operation

Hyundai Elantra AD (2016-2020) Service Manual / Body Electrical System / Blind Spot Detection System / Description and Operation

Description

BSD is a system that uses two magnetic wave radar sensors attached on the rear panel to measure the distance from the following vehicles and provides the sensing and (visual and auditory) alarm of any vehicle coming into the blind spot.

-	Blind Spot Detection (BSD) : Senses other vehicles in the BSD zone and the display a BSD warning lamp on the sied mirror for the driver. Warning lamp is blink ON when driver turns on the turn signal lamp to enter the lane where another vehicle is.

-	Lane Change Assist (LCA) : Senses other high-speed access vehicles in the LCA zone and the display a BSD warning lamp on the sied mirror for the driver. Warning lamp is blink ON when driver turns on the turn signal lamp without recognizing any sudden approaching vehicle from that direction.

-	Rear Cross Traffic Alert (RCTA) : It generates the alarming to the vehicle approaching from the rear and side during driving the vehicle backwards.

System Operating Mode

1.	When starting the engine with the switch off, OFF mode is on.

2.	When pressing ON switch in OFF mode, Passive mode is on.

If starting the engine with the switch ON, Passive mode is on.

? When IGN is ON, the switch is in the initial state : The last position is kept.

A.	If IGN OFF > ON with the switch ON, the switch is ON.

B.	If IGN OFF > ON with the switch OFF, the switch is OFF.

4.	If you start the engine with BSD switch ON, or if you turn on BSD with BSD switch OFF, the warning lamp of the door mirror flickers for 2 to 3 seconds. This is to inform the driver that the BSD system is ready. (provided that if the system is in Fail mode, there is no flickering.)

5.	If the activation conditions (speed and curvature radius) are met while driving, Active mode is on (warning issued).

6.	If the activation conditions (speed and curvature radius) are not met while driving, Passive mode is on (warning removed).

7.	If BSD & LCA operation fails in any mode, Fail mode is on.

8.	If BSD & LCA operation operates normally in Fail mode, OFF mode is on.

9.	If pressing OFF switch while BSD & LCA function is operating (Active/Passive), OFF mode is on.

Warning Condition

1.	Warning zone

2.	Conditions for BSD warning ON The entire body of the target vehicle is located behind the line A. Any part of the target vehicle pass the line B. Any part of the target vehicle passes the line D and Hysteresis In. The entire part of the target vehicle passes the line D and Hysteresis In.

Conditions for BSD warning OFF

The entire body of the target vehicle moves before the line A.

The entire body of the target vehicle moves behind the line B.

The entire body of the target vehicle passes the line D and Hysteresis Out.

The entire part of the target vehicle passes the line E and Hysteresis Out.

Conditions for LCA warning ON

The entire body of the target vehicle is located behind the line 2.5.

Any part of the target vehicle pass the line C.

Any part of the target vehicle passes the line D and Hysteresis In.

The entire part of the target vehicle passes the line E and Hysteresis In.

In the all above condition, TTC(Time to Collision) is not less than 2.5 sec.

Conditions for LCA warning OFF

The entire body of the target vehicle is located before the line B.

The entire body of the target vehicle pass the line C.

The entire body of the target vehicle passes the line D and Hysteresis Out.

The entire body of the target vehicle passes the line E and Hysteresis Out.

In the all above condition, TTC(Time to Collision) is not more than 2.5 sec.

6.	Sensor activation conditions BSD & LCA switch (indicated by the switch LED) is on. Vehicle Speed : 30 km/h or faster Curvature radius : 100m or more Relative car speed : -10 ~ 255?/h ("-" means overtaking the preceding vehicle)

7.	Sensor deactivation conditions BSD & LCA switch (indicated by the switch LED) is off. Vehicle Speed : 28 km/h or slower Curvature radius : 125m or less Relative car speed : All except -10 ~ 255?/h ("-" means overtaking the preceding vehicle)

System control prohibition

The radar is covered by debris : System conditions - Blockage message is outputted

•	If the sensor on the rear bumper is contaminated by snow, mud or stickers, its detecting performance may be lowered.

The radar installation is damaged by an outside shock : Send the error code

BSD & LCA system fails : Send the error code

The radar is overheated : System conditions - Over Temperature message is outputted.

Rear Cross Traffic Alert (RCTA)

Item	Specification	Remarks
Vehicle speed	0 ~ -10 kph	R' position
Time To Collision	4 ~ 36 kph	+ : closing
Operating area	0.5 ~ 20 m	Vehicle : 20m Bike : 15m

It is a function for helping to check the vehicle approaching from the rear and side when the car is started to backwards from parking to the front in the parking lot.

The alarming is made for the vehicle within 2 seconds based on the Time To Collision (TTC) and the human is excluded for alarming (The alarming may not be made.)

•	Time To Collision (TTC) : It means to alarm in case of 2~3.5 seconds for estimated time to colliding through calculating the relative distance/relative velocity. (It is changed depending on the relative speed of approaching.)

Warning zone

Components and Components Location

Components 1. Blind Spot Detection (BSD) Unit2. BSD switch3. Speaker4. BSD warning lamp5. Cluster ...

Repair procedures

Diagnosis with GDS 1. BSD system defects can be quickly diagnosed with the GDS. GDS operates actuator quickly to monitor, input/output value and self diagnosis. 2. Connect the cable of GDS ...

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