Replace brake light o3 tundra stepside - 2003 Toyota Tundra

hello
u will find a lot of wiring diagrams and circuit diagrams help books and stuff like this at reliable-store
the girl in the chat box can help u instantly... im a frequent buyer there since Im a mechanic so take help from there

check to see if the release of the parking brake actually engages the warning light switch fully.

trailers are add on package , 1st just inspect the fuses with a flashlight . as you should once a year.
http://www.tundrasolutions.com/forums/tundra/193937-blowing-tow-light-fuse/
lots of good answers here

Well, check if you have brake lights to start with? If you dont have brake lights, it is possibly a brake light switch under the brake pedal or a stop fuse blown. ( with brake switch malfunctioning, this could set ur check engine light and also ur brake and abs light. Check this and get back to me. By the sounds of the other accessories not working, check your 10 amp guage fuse which i am not quite sure, could be under the hood or in the cabin. keep me updated.

reverse lights are on a different circuit to the brake/tail/clearance lights. Check fuses for the others.

Unscrew the screws that are securing the brake light cover to the body of the Tundra. Pull the brake light cover off the body of the Tundra. Place the screws in the brake light cover and set it on the bed of the truck. Pull the burned-out light bulb out of the light fixture and discard it. Insert the new brake light bulb into the light fixture. Pump the Tundra's brakes to make sure the new bulb is working correctly. Replace the brake light cover on the body of the Tundra and replace the screws.

Sounds like a bad lighting control module. They were very problematic for '03.

Hello.

We would suggest that you look at the wiring connector under the bed, that feeds the taillamps.

You will probably find a coroded wire in the connector. If the 3rd brake lamp works, all of the fuses and switches are good.