My 1992 sc300 taillights will not work while the head lights are on,break lights work perfectly fine,tried new bulbs an checked all the fuses an still no luck. If anyone has any suggestions please feel free and thank you.

 

thats interesting... have u checked your wires for any shorts or breaks? also possible switch malfunction but very unlikely... ima suggest just changing the parking light fuse with a new one incase the fuse u have now is bad and u cant see it (has happened to me many times)
also are your front parking lights turning on? if not then its most likely the fuse

 

maybe you have a short somewhere

 

no the front parking lights wont come on,also weres this fuse? i dont see it under the hood/side panel

 

the fuse for the parking light is in the side panel on the driver side
ull have to move ur carpet and the fuse box is twords the lower front of the car
so its like ur reaching in into the car. its placed very badly in my opion but anyway hopefully u have the fuse cover and it will tell which fuse is to the parking light, im not sure of it off hand but ill be by my car later and post back with the number if i dont hear from you later
hope that helps

 

did a lil search cuase im bored at work and found a picture of the fuse box the fuse u want to check is the tail light fuse (17) also while your in there u might wana check the cig fuse (7) cuz on sum cars parking lights are related to the cig idk bout the sc tho
hope this helps

 

I just pulled the cig fuse out but its fine :/ an ive tried the other fuses like stop,turn,tail still no luck,Ive been hearing alot about a diode or w/e so with my luck I go to look for it and I don't have one... an i even looked under the carpet to make sure it didnt fall out but nothing.
REALLY appreciate your help btw!!!

 

Check under your driver side wheel well see if your harness is cut. Assuming your lowered

 

thanks! ill check

 

did u replace the fuse or just check it?
replace it, even if doesn't look bad

 

Check your tail light failure sensor, its a yellow or black square box located in the trunk near the antenna but more towards the gas tank, you need to pull the gas tank carpet and the left cover i think. (You should be able to find it pretty easily in that area, i cant remember 100% where it is) unplug it and open it up, see if you have a hole in it or it looks burned.

Also make sure you have the correct bulbs, i confused the 1156 and 1157 before and blew out a couple of those sensors. I was having the exact same problem as you, headlights worked, tails didnt but brake lights did. Got pulled over twice, wasnt fun.

 

how and where do you get the tail light sensor to replaceit/

 

did you ever figure out your issue? Im having the same problem...my sensor keeps frying and had to replace it a few times. Is it because the running tail light bulbs? or should i just bypass the sensor completely? does anybody know how to bypass the sensor? Please help

 

I believe theres a dome fuse in the panel almost the same thing happened to me headlights would work but no taillights or license plate lights ended up being that fuse had blown. Replaced it and haven't had a proble since

 

do u remember which fuse u replace for the license plate n tail?