Relay has been interchanged.
2004 toyota tundra fog lights not working.
Anything else i should check posted by andre rioux on mar 15 2012.
Toyota tacoma 4runner tundra fj cruiser factory service manual page if you go into the body electrical section it will give you electrical schematic drawings so you can figure out what is common to all those lights not working.
If both are good at 12v connect the red lead to pin 5 and the black lead to pin 1 and check for voltage.
Wiring from relay to fog lights is good.
Turn the fog lights on you should receive voltage.
12v from light switch low beam to relay socket is good.
I would test to see if the fog lights work by bypassing everything else.
To do this pull the fog light relay in the under hood relay fuse box.
Toyota tundra fog or driving lights are not working inspection at your home or office.
1 answer 2004 tundra fog lights do not turn on.
You will see there are four pins in the socket.
Toyota tundra with plastic bumper 2004 factory style fog lights by lumen 1 pair.
Chrome housing clear lens.
If we do not have 12v at both pins we need to double check the fog fuse and headlight fuses.
Make sure you are able to see the road ahead of you in fog rain or other conditions of reduced.
Two of them are larger then the other two.
Ground from body batt and ground at socket are not common.