Hyundai Elantra: Convenient Features of Your Vehicle / Light

Exterior Lights

Lighting control To operate the lights, turn the knob at the end of the control lever to one of the following positions: 1. OFF position 2. AUTO headlamp position (if equipped) 3. Parking lamp ...

Other information:

Hyundai Elantra AD (2016-2020) Owners Manual: High Beam Assist (HBA) indicator light, Cruise Indicator Light
High Beam Assist (HBA) indicator light This indicator light illuminates : When the high-Beam is on with the light switch in the AUTO light position. If your vehicle detects oncoming or preceding vehicles, the High Beam Assist (HBA) system will switch the high beam to low beam automatical ...

Hyundai Elantra AD (2016-2020) Service Manual: Brake Booster Repair procedures
Brake Booster Operating Test For simple checking of the brake booster operation, carry out the following tests. 1. Run the engine for one or two minutes, and then stop it. If the pedal depresses fully the first time but gradually becomes higher when depressed succeeding times, the booster ...