Bulb failure warning light comes on when I press the brake pedal. IF I turn on the parking or headlights the warning stays on.

** All lights are working properly **

I have replaced ...
# All rear light bulbs (including 3rd brake and lic. plate)
# Bulb failure warning sensor (New)
# Tail Light Circuit Boards (both sides - New)

Any Ideas

 

*Bump* With Pics

Still have the Bulb Failure Warning Light. Done drove myself nuts with this problem. The pics show the tail lights when the parking and/or headlights are turned on and car is running.



If I turn the the lights off the warning only comes on when I hit the brakes.

Anybody have an idea?

 

Just throwing out something... don't really know... but is there a 2-way (double filament) bulb that is partially blown or a 1-way (single filament) bulb installed where a 2-way bulb should be?

 

It might be possible. I doubt it, but will give it another look.

Thanks for the idea.

 

Happens often on my 89 240 too. Try replacing both brake light bulbs with NEW bulbs, and clean the socket contacts too. I remember reading somewhere the bulb failure sensor works by measuring impedence, so if one bulb or socket is corroded and not making as good contact as the other the sensor will come on even if the lights (brake lights) are still working. It's possible the relay for the bulb sensor is bad (behind dashboard above driver left knee), but I'd try new bulbs and contact cleaning first.

 

I've already replaced
# All rear light bulbs (including 3rd brake and lic. plate)
# Bulb failure warning sensor (New)
# Tail Light Circuit Boards (both sides - New)

I'll try cleaning the contacts

 

Does the R/S taillight have a white socket for the brake/parking light?
Are all the bulbs the same brand? Like silver or brass base?
Also the bulb failure relay could still be bad.

 

Passenger side (right) is white.
Bulbs are all new and silver base
I have thought of that, but Im crossing my fingers in hope it's something simpler. It would figure with my luck though.

 

I would double check all the connections for the sockets and plug to the taillight.
2 weeks ago I helped a buddy hard wire the taillights on his car. We were both very happy with how it turned out. You might want to think about doing it in the future to do away with all connection problems. I also think it will reduce heat at the taillight assembly and make the aftermarket light assemblies last alot longer.

 

I'm going to clean all the sockets later today. All the tabs have been adjusted to ensure a solid connection.

How would I go about hardwiring the taillights?

 

We soldered wires onto all the sockets. Then found all the correct wiring in the trunk and cut each wire from the plug and wired it to the socket.

 

sounds like lots fun in creating migraines.

 

It was not bad at all. We also went to a JY and cut a plug setup out of another car to put inline(Male and female) this way if you need to remove the taillight you just unplug it and remove it.