Lower brake lights won't work

[Mitzi]

Replaced fuses, bulbs and the switch under the pedal...

Any ideas?

 

[firepop5]

Do you have a message center in the console? If so, power to brake lights passes through the lamp out module. Check out this video, you probably have a broken solder joint inside of it.


http://www.youtube.com/watch?v=ry0l9ttrDmM

 

[Mitzi]

Thanks, I was stumped! I will check that out tomorrow!

 

[gijoecam]

Indeed, the lamp out module is the only thing between the splice that feeds the rest of the stuff (like the CHMSL) and the rear brake lights. Common issue.

 

[budwich]

well you need to do some testing with a meter.... instead of just replacing parts. Without testing, you don't actually know if you are chasing a voltage issue or a ground problem.

Having said that, your likely problem is your MFS switch... a few posts have found this problem in the past.... of course, it depends on the options as others have mentioned. Anyways, a meter will certainly help focus your journey.

 

[firepop5]

Your high stoplight works, right? If so the fuse(#13) and pedal switch are fine. Power leaves the pedal switch on a light green wire when the pedal is depressed. This wire goes to a splice where the power is split between the low stop lights and the high stop lights. The wire to the high stop lights (light green) goes to fuse #2, and then to the high stoplight. The wire for the low stop lights then goes to the lamp out module. It enters the LOM as a light green wire. Power then leaves the LOM on a red wire with a white stripe on the way to the low stop lights. If when you step on the brake pedal there is no power in this red/white wire, the LOM is the problem.