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Discussion Starter · #1 ·
Hello,

I just installed a aftermarket stereo system , nav , etc . I now am having door ajar/ check brake system messages come up . My gauge lights are also not working , although my turn signals , brake lights work on the outside of vehicle . I just bought a obd 2 reader at walmart , but it is not showing any codes . I would really appreciate it if one of you could let me know what is possibly wrong with my truck . -2008 f-450 -

also, while driving , my instrument lights will come back on , and error messages will disappear , but then reappear a few seconds later

thanks so much,

blake keeton
 

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I can't help much, but the "check brake system" I believe is a bad battery. I read about this a few months back on 1 of the forums. The check brake system would flash on the computer the first time the truck is started on cold mornings. About 3 weeks ago I had 35,000 plus miles and I knew it was a battery problem so I made an appointment with the dealer to have it checked out. I stopped at Advance on the way to the dealer to have the batteries checked and sure enough the driver's side battery was bad. I went on to the dealer but didn't tell him I had it checked earlier. He said my brake fluid was low so they topped it off and both batteries checked out ok. I told the service writer then that Advance said I had a bad one. He said they checked out fine with his equipment and the brake fluid was my problem. Wrong! Still flashes check brake system on the first start on cold mornings. I was hoping to get a new battery before my bumper to bumper warranty ran out. I guess I'll be getting new batteries soon, (Ford needs the money more than I do I guess).
 

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the problem is they will only replace the one battery under warranty. You really need to replace both at the same time. In addition, having weak batteries can cause issues with the computers. I would bite the bullet and replace the batteries yourself. A lot of times they check the batteries while they are connected to the truck. Most of the testers have a dual battery mode but in most cases even using the dual mode they still will check out ok but disconnect and test each alone and you will find the bad one.

Now for the original poster...does it give you the message during first start? Does it do it when your stereo system is on and when it is off? Following the same line of reasoning as dw when first starting you are running the glowplugs and if you are running large amps you could actually have a substantial low voltage condition.
 

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Discussion Starter · #4 ·
The dash light problem started soon after the install . It does it when the stereo is off or on , right after start up , during driving , etc . The door ajar / check brake system light continually scrolls , with the dash lights coming on for a few seconds , then going off again . They stay off mainly though . I am going to go by best buy tomorrow and talk to an installer to see if he has had this happen to him before . I do appreciate the help though fellas !

blake
 

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i wouldnt go back to see if he has had that issue, i would demand they correct it. If you take the truck to ford, and ford can prove that your issues are related to the install you are going to be out some coin. i'd make best buy fix it
 

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On the possibility that you might have actually wired up something wrong, put your stock radio back in place. Undo everything that you did--pull all the wires (tape off anything that you spliced so that you don't short it out). I'll bet you that when you pull all the wires that you put in, your problems will disappear. Yes, I know this is a pain, but your problem sounds like incorrect wiring.

I don't agree with anyone's assessment of a "bad battery". A "bad battery" would give you a slough of other problems, none of which would logically indicate a problem with your brake system or your doors being ajar. It's MUCH more likely that you wired up your system incorrectly.
 

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It has 0 to do with your install. I have installed nothing in mine and on cold or damp mornings I get "check brake system". Dealer went through all the system and even removed the whole harness and is stumped, figures the POS would do this with a bad battery.
 

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Discussion Starter · #9 ·
I had both batteries tested today at a battery shop . They said that the batteries are only showing a total of 1200 cranking amps , which is way below 750 A X 2 . One more thing to add to my dealer to do list . Wish me luck fellas , and thanks for being helpful .
 

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I have been getting the "check brake system" message for a fraction of a second when I start the truck on cold mornings. Today, the truck would not start. I have it on a battery charger right now, but I was wondering if you guys have had luck getting the dealer to replace both batteries. My 36-month BTB warranty ends next month, and I wasn't sure if I should even bother.
 

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the solution in my case was the drivers door switch, there was no codes relating to it and on ids when monitoring the door switch it read correctly from closed to open, just for fun replaced it as all other options had been eliminated. with new sensor installed issue was solved and been good since.
 

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the solution in my case was the drivers door switch, there was no codes relating to it and on ids when monitoring the door switch it read correctly from closed to open, just for fun replaced it as all other options had been eliminated. with new sensor installed issue was solved and been good since.
what sensor was it exactly? My boyfriend is currently having this problem. He has replaced the brake light sensor and the fluid pressure sensor and it is still on. Any help would be appreciated.
 

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Anyone have any solid answers as to why this happens? It's not bad batteries or anything like that, new batteries here. The only thing I can think of is I hooked up one uplifter switch and a light bar. First time driving truck after and it started this message after about 30mins of me driving it. Other than dash lights going on and off there doesn't seem to be any other issues. The door open light flashes etc. Going to unhook the light bar and tape All the connections up and see if it continues.
 

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Anyone have any solid answers as to why this happens? It's not bad batteries or anything like that, new batteries here. The only thing I can think of is I hooked up one uplifter switch and a light bar. First time driving truck after and it started this message after about 30mins of me driving it. Other than dash lights going on and off there doesn't seem to be any other issues. The door open light flashes etc. Going to unhook the light bar and tape All the connections up and see if it continues.
I have this issue right now going on in my truck, I know this is a diesel forum but it seems all ford trucks around this era are connected in this issue. I have a 2009 f250 2wd xl 5.4 liter 16v utility bed. It all started a couple of months ago when it started to get humid in June in Ohio all three lights would come on simultaneously about ten minutes after turning on ac. Doors closed checked tire pressure and brakes were good. After reading online started with new battery. Battery was bad so got a new one. Was ok for awhile then same thing, dealt with it for month or so then everytime ac went out I would sit there going over things in my head what would do this. Opened glove box and reached in to the ecu area and was all wet with condensation thought it could be from ecu shorting out cause the way everything was starting to go haywire like turn signals, clicking in the brake pedal, and dash cluster staying on after shut down. Finally just pushed in on ac control knob and it fixes it everytime if you hold it in, as soon as you let go it comes back on. So im 99% sure this is what is wrong with mine. But after reading about others it could be a short anywhere inline with all these parts looks like a flaw in Fords electric wiring if one part is bad it can set off a cluster **** of not serious mechanical problems but very irritating for sure. I would start with battery then move to loose connections, then testing sensors, ac, anything that might be connected to this system. Not a mechanic but seems all this stuff to test is in the dash so probably going to be hard to find everything to test and you have to know what it should be reading in volts or ohms idk good luck let me know how it goes for you.
What was the solution to the issue?
 
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