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2005 deville. brake lights all go out including 3rd.

Customer Question
2005 deville. brake lights...

2005 deville. brake lights all go out including 3rd

Mechanic's Assistant: Have you checked the brake fluid? How's the level and when was it last changed?

Resetting error codes turns them on but only for a while

Mechanic's Assistant: Are you fixing your DeVille yourself? What have you tried so far?

Bulbs are good

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

Traction control light stays on and it says sytems electrical ceck or something to that effect

Submitted: 7 months ago.Category: Cadillac
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Answered in 3 minutes by:
12/18/2017
Cadillac Mechanic: Mechanic01, ASE Certified Technician replied 7 months ago
Mechanic01
Mechanic01, ASE Certified Technician
Category: Cadillac
Satisfied Customers: 3,748
Experience: Owner at Baltic investments
Verified

Hello my name is ***** ***** welcome to just answers! I will be assisting you with all of your vehicle questions today. Give me one moment while I review your question and come back with a answer. Please be aware I do not know your skill level or abilities so I will be asking a lot of questions and in a lot of cases we will respond to each other quite a lot before we find a solution. As far as phone calls are concerned that is the system prompting you, not me, and they do cost more money, I prefer text but in some cases a phone call is required. If I don’t answer right away or quickly in conversation I am helping another customer or have stepped out for a moment and will respond as soon as I can. Ok lets get started!

Have you had the vehicle scanned for the trouble codes?

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Customer reply replied 7 months ago
i know how to get them but i did not write them down
Cadillac Mechanic: Mechanic01, ASE Certified Technician replied 7 months ago

if you could get those codes for me it would help out a lot

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Customer reply replied 7 months ago
ok give me 5 minutes
Customer reply replied 7 months ago
i cleared the codes twice yesterday
Customer reply replied 7 months ago
lights are working now and check electrical is now off but will come back again
Cadillac Mechanic: Mechanic01, ASE Certified Technician replied 7 months ago

as soon as they come on write them back down and then we can continue with the diagnostics

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Customer reply replied 7 months ago
upc 1000 current
pcm p1754 history
pdm b3832 current
ipm b0429 current
Customer reply replied 7 months ago
i dont think theses are the codes you need
Cadillac Mechanic: Mechanic01, ASE Certified Technician replied 7 months ago

those are good codes, so all of these codes have 1 thing that cause all of then and thats a low battery or odd voltage situation, have you had the battery load tested and the connections checked?

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Customer reply replied 7 months ago
it was a C code and i dont have it and cant get it till lights go out again
Customer reply replied 7 months ago
replaced battery yesterday and had new battery checked and all is well
Customer reply replied 7 months ago
old battery had same codes as I recall
Customer reply replied 7 months ago
why would resetting all the error codes turn the brake lights back on
Customer reply replied 7 months ago
that's just bizarre
Customer reply replied 7 months ago
unfortunately the check electrical sys will return and brake lights go out at that point
Cadillac Mechanic: Mechanic01, ASE Certified Technician replied 7 months ago

its prob something to do with a computer and a voltage issue, these things are known for bad grounds

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Customer reply replied 7 months ago
turn signals, hazards and backup lights work fine
Customer reply replied 7 months ago
is there any remedy?
Customer reply replied 7 months ago
there is a clicking sound when i push the brake. i hear it near the shift stick. it may have always been there but it seems i only notice it now.
Cadillac Mechanic: Mechanic01, ASE Certified Technician replied 7 months ago

I am curious to what code is going to come back can we wait on that? I think this will help the diagnostics

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Customer reply replied 7 months ago
how much time can go between questions and answers? this could take a day to get the error to trip again
Cadillac Mechanic: Mechanic01, ASE Certified Technician replied 7 months ago

weeks lol, so you have no worries, it will be the same cost no extra fees or anything

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Customer reply replied 7 months ago
no additional codes came up on check electrical sys warning
all brake lights went out again and come back on after resetting all codes
ipc u1000 current
ipm b0429 current
pcm p1574 current
pdm b3832 history
Cadillac Mechanic: Mechanic01, ASE Certified Technician replied 7 months ago

im looking up procedures and I dont have anything on this in my database, ill have to open this back up to the other techs for assistance

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Cadillac Mechanic: sprinkles08, ASE Certified Technician replied 7 months ago
sprinkles08
sprinkles08, ASE Certified Technician
Category: Cadillac
Satisfied Customers: 24,193
Experience: ASE Master and Advanced level certified. Factory trained with 17 years dealership experience
Verified

Hello and welcome to JustAnswer! I apologize for the extended wait time you experienced, I've only just come online now and would like to assist you with your question.

Your problem involves the brake switch in some way. The lights aren't working because there is no signal from the brake switch, and that's also why the P1574 is setting. It's going to require some electrical testing at the time the problem is happening to determine exactly what is going on. You could have a wiring or module issue, but a bad brake switch would be more likely.

My goal is to give you the best experience possible! I hope I have earned a 5 star rating! Please remember to rate my service by selecting the 5 stars at the top of the screen before you leave today. If you need more assistance, please use the reply box and let me know.

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Customer reply replied 7 months ago
Thats what i thought. I will try that first and if that does not work i may try to use the engine ground and ground it to the frame. Dont really want to search for a bad ground
Cadillac Mechanic: sprinkles08, ASE Certified Technician replied 7 months ago

I don't expect you to have a ground issue.

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