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2004 Chevy Silverado Z71 All Brake lights do not function
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Discretesignals
Ultimate Carjunky
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Nov 12, 2015, 10:53 AM
Post #26 of 36
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Re: 2004 Chevy Silverado Z71 All Brake lights do not function
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Maybe your back probe isn't making contact. Are you sticking the meter probe in there? You can also use a paper clip or T pin. Maybe your probe isn't long enough to reach up in there.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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Fernie ski bum
User
Nov 12, 2015, 11:23 AM
Post #27 of 36
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Re: 2004 Chevy Silverado Z71 All Brake lights do not function
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I actually pierced the wire down stream of the socket
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Fernie ski bum
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Nov 12, 2015, 1:33 PM
Post #28 of 36
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Re: 2004 Chevy Silverado Z71 All Brake lights do not function
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Well I gave up and took it to a neighborhood garage. They tested the brake switch and confirmed it is OK. They suggested it's the signal switch in the steering column. Can even do the job till Saturday.
Does the Signal switch sound like a possible issue and if so How do I check it without blowing my airbag?
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Discretesignals
Ultimate Carjunky
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Nov 12, 2015, 1:52 PM
Post #29 of 36
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Re: 2004 Chevy Silverado Z71 All Brake lights do not function
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Really don't think that a turn signal switch is going to cause no brake lamps. At least according the wiring schematic. Brake and turn are on different power side circuits, but they share the same grounds.
Don't understand why you don't have battery voltage piercing the light blue wire, but you have it in the socket. Doesn't make sense.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Nov 12, 2015, 1:56 PM)
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Nov 12, 2015, 2:08 PM
Post #30 of 36
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Re: 2004 Chevy Silverado Z71 All Brake lights do not function
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Fernie - IMO - yes possible but if some info I just looked up is accurate the flasher for turn signals might be the issue instead? Total guess but seems so is the garage you had look at it but something you could try if the flasher looks like this and has 10 pins.
If to find the right one if not in fuse panel inside listen for the clicking and feel it when turn signals are working if they work.
Pic and might be wrong!
If like that (different brand no doubt) take it out an tap on it with a plastic end of a screwdriver just go easy as the sucker is $75 bucks! Yikes!
GM -and others when they do this it's so full of points and mini coils the low voltage if a failure points stick or quit. Many if a love tap is administered will behave right away! Maybe not too. But if it snaps right out of this problem either just by removing and replacing same one then if with that love tap makes it work the trouble is about 99% right there.
For those bucks I'd be at a bone yard for another from a nice dry wreck.
Reason: They are not air tight or last SOB funky chase for one like it but intermittent so near impossible to be sure of anything a new one fixed it. It's still guessing and hate that which is why I would go used because of the nasty price. Bet is turn signals cancel the brake light on one side sharing that filament by all look ups and it's AFUed at this or really could be at the multifunction switch as your place suggested.
Can't compete with a hands on check by them but this shouldn't be harmed for a gentle test. No diagrams for wire colors available to me to know by test light the issue is there so remains a guess on my part,
T
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Tom Greenleaf
Ultimate Carjunky
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Nov 12, 2015, 2:11 PM
Post #31 of 36
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Re: 2004 Chevy Silverado Z71 All Brake lights do not function
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Sorry - DS and I posted at the same time but still think it's worth a check. When that many connections right at a stupid item it's probably cancelling the ground inside it via points? Still a guess as said,
T
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kev2
Veteran
Nov 12, 2015, 3:02 PM
Post #32 of 36
(1077 views)
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Re: 2004 Chevy Silverado Z71 All Brake lights do not function
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my diagram is the same as Discretesignals the brake circuit splices out before combination switch...
if the vehstop fuse is good go to - rear tail light circuit board*... located on frame rear at spare by the round crossmember - often fails internal...all rear harnesses
plug in....
* google -2004 Silverado rear tail light junction block
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Fernie ski bum
User
Nov 12, 2015, 3:56 PM
Post #33 of 36
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Re: 2004 Chevy Silverado Z71 All Brake lights do not function
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Wow lots of info I will try all the suggestions and report back. May take a bit as I am working on something else right now.
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Fernie ski bum
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Nov 12, 2015, 5:41 PM
Post #34 of 36
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Re: 2004 Chevy Silverado Z71 All Brake lights do not function
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We have a winner!!!!!!!!!!! got one light to work by tapping on this flasher and found the other bulb burnt out. Replaced it and BINGO!!!!!!Both lights now work the third light is not working but I don't care because it is covered by my Canopy. I am going to replace the flasher tomorrow so I don't have to keep tapping that little bugger.
Thanks everyone for your help greatly appreciated. I am out.
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Discretesignals
Ultimate Carjunky
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Nov 12, 2015, 6:21 PM
Post #35 of 36
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Re: 2004 Chevy Silverado Z71 All Brake lights do not function
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Still confused on this. The stop lamps and turn signals have different circuits. The only thing the stop lamps and the flasher have in common is the brake switch is used by the flasher module as an input for the trailer brakes lights.
The brake lamp bulbs are above the turn signal bulbs inside the tail lamp lense, right? I guess without being there to take some voltage measurements at different parts of the brake lamp circuit, i'm going to be baffled. Maybe you have a bad connection in your IP fuse block and jiggling the flasher reestablishes the connection.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Nov 12, 2015, 6:24 PM)
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Tom Greenleaf
Ultimate Carjunky
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Nov 12, 2015, 10:15 PM
Post #36 of 36
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Re: 2004 Chevy Silverado Z71 All Brake lights do not function
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Again - I'd go used at the price and this isn't conclusive yet IMO. DS posted the diagram which I can't blow up enough to read via my devices but also said it might be the connections at that fuse block! Might be!
Thread is bucking for the second longest in site history. Reason again that those flashers and relays go bad IMO is again moisture if only temp changes and humidity. Points inside (you can see where you can open those when another is working take a look) are a mess of points like ignition points and mini winding to pull them to touch but the current thru isn't correct and item either wont shut off or doesn't work. Some can sit there buzzing.
HEY! You found a bad bulb over this now IMO a cause perhaps at that socket or the common connector again. This thing is now 12 years of being in the elements and the OE grease now suks. Might just as well be on an oil change schedule to take them all apart and re grease them dammit.
NOW - your third brake light isn't working! I forget how many bulbs are in the damn thing but they suk too. All could be bad - same bull the rubber seal if like last one (my own) is junk rubber, damp in there so sockets compromised - grease gone again. If you go there and like ones I've messed with put rubber on needle nose pliers to get bulbs out - easy to just smash bulbs to even look.
*******************
Side note on why I think outside the box so much: Area shops/friends in the trade even EE (electrical engineering) friends from MIT (no joke) quit or don't have time on some elusive something like this and knew I would be the sucker who would spend countless hours when other pros gave up to find some red-neck trick pointed to the problem or sometimes solved it. These people or places sent me the work as they ran out of time never finding the source problem frequently because one bit or a test that failed by tools used that gave proper diagnostic readings on a failed device or how to use it sent off on a tangent where there was no problem. I had the time.
BTW - go back to where you poked that wire and find it. Now seal up the puncture hole or that will be a problem possibly a year from now when wire inside corrodes right there,
T
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