So ive done the research etc on lexls and here and have a question on my 91 ls4.
I recently fixed/ replaced the tails to all clear set up after the car was hit. The body shop installed the 2 center tails there and there was no problem. but after i installed the 2 outter tails 2 days later and drove the car at night... my problem arose.
When i turn the lights on i get the "running light out" light symbol on my car on. same as the brake light out except this only comes on when the lights are turned on after a extensive checking and re-checking. There are no lights out at all be it back up brake light turn etc; as well as, no pinched or frayed wires that i can find.

Might anyone have any ideas?

 

1.. Is the brake light out in the rear window, or maybe a bulb blown?
2. You may have a terminal out within the light itself. Brake light term may be good but running light term may be bad . Might want to pull the bulbs and check them all individually.

Any of these 2 can cause the "light out" symbol to pop up on the dash. Mine does so now, but only b/c I removed the bulbs from out of the rear window light.

 

are you running LED bulbs?

you did use the right size/type right...

 

No standard colors bulbs. Talked to My local shop guy he said the sensor system runs off resistance readings. Im a little bit of an electrician so i guess today i will be checking Ohoms readings. He said sometimes replacement bulbs can be a little bit different interms of resistance and can cause the problem.

Trunkn nopee the 3rd brake light is not out at all. had both lights replaced there 2 months ago no problems as for terminals i will check those too!