If this warning light comes on while the engine is running, the battery is not being charged. Immediately turn off all electrical accessories. Try not to use electrically operated controls, such as the power windows. Keep the engine running; starting the engine will quickly discharge the battery.
If there is a malfunction with either the alternator or electrical charging system:
1.Drive carefully to the nearest safe location and stop your vehicle.
2.Turn the engine off and check the alternator drive belt for looseness or breakage.
If the belt is adjusted properly, there may be a problem in the electrical charging system.
In this case, have your vehicle inspected by an authorized HYUNDAI dealer.
Hyundai Sonata LF 2014-2019 Service Manual: Hazard Lamp Switch Repair procedures
Inspection
1.
Check for continuity between terminals. If the continuity is not as specified, replace the hazard lamp switch.
AVN typeAudio typeNoDescription NoDescription 1GND1GND 2CAN _ High 2-3CAN _ Low 3- 4- 4-5Detent 5Detent 6ACC6Acc 7Battery (+)7Battery (+)8PAB Off 8PAB Off 9 ...
Hyundai Sonata LF 2014-2019 Service Manual: Rear Glass Defogger Printed Heater Repair procedures
Inspection
Wrap tin foil around the end of the voltmeter test lead to
prevent damaging the heater line. Apply finger pressure on the tin foil,
moving the tin foil along the grid line to check for open circuits.
1.
Turn on the defogger switch and use a voltmeter to me ...