What is the Fog Light Relay?
Your fog lights don’t need to be on if the headlights aren’t on. For that cause, a fog light relay is used. The fog light relay acts as a switch, enabling the fog lights to come on only when certain criteria are fulfilled. Typically, fog lights do not come on when the high beam headlights are on either. The relay directs power to the fog lights only when the switch is on and the right lighting circuits are on. The use of a relay means a low voltage fog light switch can be used. If the full voltage of the fog lights runs through a switch, the switch will become very hot and overload.
READ ALSO: CAUSES OF FAULTY FOG OR DRIVING LIGHT
If your fog lights are drawing too much current, the relay can sustain damaged; conversely, a bad relay can cause damage to other components in your lighting system.
How to Fix:
The faulty fog light relay is identified and access panel removed
The defective fog light relay is removed
The new fog light relay is fixed
The fog lights are tested for proper operation and access panel installed
The fog lights are finally checked for proper operation
Fog light operation is checked when even upkeep inspections are performed. If the fog lights aren’t working, have them diagnosed and repaired by one of your expert mechanics.
READ ALSO: HOW TO REPLACE REAR WINDOW DEFOGGER SWITCH
Common signs indicating you may need to replace the Fog Light Relay:
Turning on your fog lights only result in a clicking sound
Fog lights do not work and the appropriate switches don’t light up
Fog lights are on all the time
Importance of this service:
All lights are required to function as designed for a vehicle safety inspection. Not only will your vehicle not pass the inspection if the fog lights aren’t working, but your night vision will be obstructed. Have the fog light relay changed as soon as it is deemed defective.