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Does anyone what the four poles (+/GRND/etc...) are on the OEM foglight switch? My wiring diagram doesn't go that far in depth. The [fog] lights don't work at all.
Fog Light Switch has 4 wires. Black to ground. Yellow to fog light relay. Red/Black goes to headlight dimmer switch low side which is locate in the steering column multi-function switch. The other Red/Black goes to the fog light indicator light on the dash.
Most common causes of Fog Light Failures:
1. Blown fuse in power distribution box
2. Blown fuse in fuse panel
3. Burned out bulbs
4. No voltage to Headlight switch
5. Damaged headlight switch
6. Damaged headlight dimmer switch
7. Fog light relay not functioning or open
8. Damaged wire from relay to fog light