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Thread: Brake light issue
03-31-2014, 10:05 AM #1
- Join Date
- Mar 2014
Brake light issue
Hello I have a 99 Sierra 4x4 that I just bought and just realized the brake lights do not work. So far I have checked/replaced fuses, bulbs, brake switch, circuit board, etc. I am at a loss as to what the cause could be. 3rd brake light does not work either. The turn signals, park lights, and backup lights work just fine. I tried to check grounds off the tail lights and all the wiring seems to be going back to the circuit board so I don't know where else to look. Any help or places to start looking will be greatly appreciated. Thank you.
03-31-2014, 04:02 PM #2
You need a volt meter to track it down.
Sounds like you have changed everything, but here is a quick overview.
12v power through a fuse, to brake light switch, at this point the circuit usually splits, one lead going to the center light, the other going to the rear taillights. Both of these circuits will be fuses.
- if all three are dead, the problem is the first fuse, or the switch.
- if the center light is out, it is usually a bulb, or the fuse for that circuit (does your truck have a bulb, or is it an LED assembly?)
- if the two in the tails are out, it is usually two bad bulbs, the fuse, or a broken wire.
You tell me you have checked/replace the fuses and the bulbs, please tell me how you did this?Ray
'09 Avalanche LTZ - Black
'05 Envoy XL (sold)
03-31-2014, 04:51 PM #3
- Join Date
- Mar 2014
I checked both fuses, one under hood labeled "STP LTS" 10A.
checked fuse in dash labeled "TAIL LTS" 10A
replaced both tail bulbs 3157
replaced tail light circuit board
removed and checked the brake switch, took it apart and didn't see anything broke or anything like that
all 3 stop lights are inoperable.
03-31-2014, 06:26 PM #4
Under the hood, you have a fuse marked STOP/HAZ
In the dash, you have a fuse marked #1 which is stop CHMSL and haz
Here is a copy of your owner's manual: http://www.gm.ca/media/owners/manual...nual_en_CA.pdf
Check page 6-71 and 6-74.
Ok, the switch looks like it is good; but, does it operate when the pedal is pushed, maybe it's out of adjustment.
Ya know, you've changed a lot of parts; for about $10 you could have purchased a volt meter and with a little practice, followed the voltage to the problem.
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