Checking the Washer Fluid Level

Check the fluid level in the washer fluid reservoir and add fluid if necessary. Plain water may be used if washer fluid is not available. However, use washer solvent with antifreeze characteristics in cold climates to prevent freezing.
WARNING
To prevent serious injury or death, take the following safety precautions when using washer fluid:
Brake/Clutch Fluid
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Components
ConnectorPin NOFunctionConnectorPin NOFunctionA1LowB18ILL- (RHEO)2Common19Sensor ground3Ground20Ground4Middle Low21Battery (+)5Middle High22ISG DC6High23ISG B+B1IGN224ILL+ (TAIL)2PAB IGN125Sensor REF (+5V)3HTD (Rear defog indicator)26EVAP sensor (+)4Detent Out (-)27AMB sensor (+)5PTC ...
Hyundai Elantra AD (2016-2020) Service Manual: Battery Components and Components Location
Components
1. Battery insulation pad2. AMG Battery3. Battery tray4. Battery mounting bracket5. Battery sensor
...