For a number of reasons, it can be frustrating to be married to my husband. (And, yes, undoubtedly, there are as many-- or more-- reasons it must be frustrating to be married to ME!) But this is a not a post to vent or cause problems... Just one to scratch my head, and laugh.
My husband knows many, many things. I do not know as many things. This is by choice. It is not that I am incapable of learning all these things; I consider myself quite intelligent. It is, rather, that I already know other people who know such things, so, I figure, why bother learning when I could just ask them? Sometimes, though, with Todd, it can be very difficult to discern whether:
(a) he doesn't know,
(b) he knows but doesn't want to do anything about it, or
(c) he's just messing with me.
Case in point: the non-functioning car remote.
A: "The remote doesn't work for my car. It won't unlock the doors, opening the sliding doors, or run the lift gate. Do you think it needs a new battery?"
T: "I doubt it. Your car isn't very old. Besides, sometimes those key buttons don't even run on batteries. My old car's didn't have a battery; when it quit working, I had to order a new one."
A: "So, what should I do? It's getting really annoying that I can't open the doors."
T: "Call the dealership-- the service guy will help you."
A: "Hi, I need some help with the key remote for my 2012 Odyssey. It doesn't work."
SG: "You mean the buttons on the key itself, like the one that unlocks the doors?"
A: "Yes."
SG: "Probably a dead battery."
A: "Yes, I thought that might be the case, but I know sometimes these things don't have batteries..."
SG: "There's a quick way to know for sure-- Hold down any button and see if a tiny, red light shows up on the top of the remote."
A: "I'm pressing the lock button, but there's no light."
SG: "Just as I thought, dead battery."
A: "OK, is that something I can replace myself?"
SG: (long pause) "Sure... Just be really careful removing the screw, because it's easy to strip, or bring it here and we can do it for you."
A: "How can I tell which size battery I will need? Is it listed in the manual?"
SG: "Probably. Otherwise, you could take out the old battery first and take it with you to the store."
A: "OK, thanks. I'll do that. I'm sorry to bother you... I just wasn't sure if the remote was even battery-operated."
SG: "How else would it work?"
Later, I googled "How is a car remote powered?" and I found the most fascinating thread. It is really long, so you can stop reading when it stops being interesting, but, suffice it to say, I am not alone... And, I am amused:
View Full Version : What powers remote car keys?
Jeff Root
2011-Nov-21, 02:40 PM
Magic? Suspension of physical law? Piezoelectricity?
-- Jeff, in Minneapolis
PraedSt
2011-Nov-21, 02:52 PM
A small battery.
jlhredshift
2011-Nov-21, 02:55 PM
WOW, how shocking that is!
Ivan Viehoff
2011-Nov-21, 03:06 PM
There are two ways they can work, at least.
One mode of operation is that the key transmits, based upon an internal power source, a battery. Because they consume tiny amounts of power to create this very weak field only when you press the button, a small battery can last a very long time, over a decade. Because of this, usually there is no facility to change the battery, but on older keys you used to be able to change the battery.
Another mode of operation requires no internal power source, rather it works like a contactless smart card or RFID device. That is, it interacts with a field emitted by the car (powered by the car battery), and induces just enough internal power from that field to transmit back to the car (like a crystal radio of old - power was only required for amplification). It means, of course, that the car has to be perpetually emitting little fields to be ready whenever you turn up with the key, but I think that the amount of power to do this is so low that it can do it for weeks and weeks without making much impact on the battery's charge level.
I think that you can probably even have a key with a button on it that actually works in the latter way - pressing the button selects the doors to open, for example, but the power to do that is induced entirely from the field emitted by the car.
Jeff Root
2011-Nov-21, 03:45 PM
I've had a fair number of batteries, and I've never known one
to last more than 11 years, even when left unused in the original
package. These car remote keys have been in use for more
than 11 years.
Since they sometimes work from 30 feet away from the car or
more, I can't believe the car is putting out a signal strong enough
to get a return from the remote, unless maybe the entire frame
of the car is acting as the receiving antenna.
Neither the Wikipedia page on car remotes nor a How It Works
page on the subject say anything about how they are powered.
Can anyone provide a link which explains it, preferably with a
photo of either a battery or a receiving antenna in a remote?
Has anyone here ever had a battery for more than ten years
that still worked? What type of battery could last that long?
I would expect that a small battery would have a shorter shelf
life than a large battery, because of the larger surface area-
to-volume ratio.
-- Jeff, in Minneapolis
Swift
2011-Nov-21, 03:56 PM
How to change the battery in your car's keyless remote (http://autorepair.about.com/od/quicktips/ss/remote_battery.htm) (from autorepair.com, complete with pictures), for those remotes that have replaceable batteries.
On my Ford my remote stopped working a few months ago (after six years) and I had to buy a new remote - the battery was not replaceable.
schlaugh
2011-Nov-21, 04:20 PM
My Infiniti I-30 (a.k.a. Nissan Maxima) celebrates its 12th birthday next year and the remote still works, although I need to be somewhat closer to the car than when it was new. Geriatric-induced deafness?
NEOWatcher
2011-Nov-21, 04:21 PM
Has anyone here ever had a battery for more than ten years
that still worked?
8 1/2 Years and counting on one of my vehicles.
One of the remotes for it died, but the battery in it was still good. It seems to have lost it's programming instead (or some other circuit issue).
To replace it, I would need to have both replaced, and the car reprogrammed to match the remotes.
How to change the battery in your car's keyless remote (http://autorepair.about.com/od/quicktips/ss/remote_battery.htm) (from autorepair.com, complete with pictures), for those remotes that have replaceable batteries.
That link only addresses two types of remotes. One that I haven't seen in a car remote, the other for a car very few people have.
The former is one of those "duh" ones because a lot of things with a button battery seems to have the same kind of "use a coin to open" type of cover.
The latter looks like a useful explaination. Even though the button to open is there, I can understand someone not being able to find it.
Mine was a matter of popping the two press-fit halves apart.
I don't know how my newer car can be done with any of those methods.
Jeff Root
2011-Nov-21, 04:24 PM
No sign of any opening on these remotes.
They are for a Buick Century, 2000, I think.
-- Jeff, in Minneapolis
ShinAce
2011-Nov-21, 04:25 PM
My watch battery is going on 13 years old and still works perfectly as far as i can tell. It is a rechargable titanium ion battery for a citizen ecodrive watch. I imagine a basic lithium battery could have enough shelf life for a remote starter. How many people drive a car for 10 years without losing the key once?
Fazor
2011-Nov-21, 04:39 PM
I have two remotes for my car's locks. Batteries for both have long died. One about two years ago, and the other last year. My solution? I took them off my keyring. :-P I don't really *need* them. Only time it's inconvenient is if I'm trying to get into my locked car from the passenger side, which doesn't have a keylock. That just means I have to walk a few steps around to the driver's side to unlock the doors.
Mine can be replaced fairly easily, but the stupid things run like $20/ea. I simply don't care that much.
Fazor
2011-Nov-21, 04:42 PM
How many people drive a car for 10 years without losing the key once?
I have both my original keys and remotes (even though the later sit in a drawer unused, see prior post.) My car is 12 years old. So there!
Ivan Viehoff
2011-Nov-21, 05:31 PM
Since they sometimes work from 30 feet away from the car or
more, I can't believe the car is putting out a signal strong enough
to get a return from the remote, unless maybe the entire frame
of the car is acting as the receiving antenna.
RFID can certainly work from 10m away, but I agree with you that at that distance likely the key is powered. Keys may be dual mode.
toolazytotypemyname
2011-Nov-21, 06:12 PM
Has anyone here ever had a battery for more than ten years
that still worked?
I have a TI-68 calculator that was a required purchase for Circuit Analysis class during the fall semester of my sophomore year of college. So I would have bought it in September of 1990. It still works, not that I ever use it anymore.
So that's 21+ years. What do I win?
NEOWatcher
2011-Nov-21, 07:13 PM
No sign of any opening on these remotes.
They are for a Buick Century, 2000, I think.
You think? Is this someone elses key that you're trying to figure out, or don't you know what kind of car you have? :eek:
Are you having a specific problem with one?
Here's a picture of a 2000 Century key fob (http://www.ehow.com/how_7323217_fix-fob-buick-century-2000.html) in an article about how to reprogram it. (They left out the part about rubbing your stomach and patting your head while turning yourself around three times)
But, it doesn't look too much different than my 2003 chevy fob.
I was nervous as all get-up when I popped it open since I wasn't sure I was going to break it. I finally told myself, It aint working anyway, so I'd either need a replacement, or a dealer to deal with it anyway.
If it ain't workin, it could be the battery, the reciever in the car, or the fob transmitter itself.
In my case I ruled out the car (since I had one working fob), and ruled out the battery since I tried swapping them, and tried a new battery.
Swift
2011-Nov-21, 07:17 PM
Magic?
It is magic. First, roll a D20... ;)
PraedSt
2011-Nov-21, 07:34 PM
Neither the Wikipedia page on car remotes nor a How It Works
page on the subject say anything about how they are powered.
Can anyone provide a link which explains it, preferably with a
photo of either a battery or a receiving antenna in a remote?
Has anyone here ever had a battery for more than ten years
that still worked? What type of battery could last that long?
I would expect that a small battery would have a shorter shelf
life than a large battery, because of the larger surface area-
to-volume ratio.
-- Jeff, in MinneapolisGoogle Images turns up a lot of pics. Button batteries tend to last long in my experience. My last set of brokerage security tokens lasted 5 years, and they ran continuously. Don't know why- they might use a different electrolyte than AAs.
Jeff Root
2011-Nov-21, 08:05 PM
NEOWatcher,
That photo doesn't look like the fobs. The car must be a 2001.
It was bought early in the model year. So it was bought in 2000.
That's the year I was remembering. Still over 11 years ago.
You prompted me to find a photo of what the fobs do look like:
http://www.facebook.com/notes/CheapHomeProducts22/Buy-Now-20012005-Buick-Century-Keyless-Entry-Remote-Fob-Clicker-With-Free-DoItYourself-Programming-Free-eKeylessRemotes/295847537100652
I've wondered about how they were powered for a long time.
Recently the trunk has sometimes not been opening, and that
problem reminded me to finally ask. (I'm generally only near
the fobs or near a computer, not both, so when I get to the
computer I've forgotten about the fobs.) If there is a battery
in the fobs, the other functions may fail soon, too.
I can afford to buy new fobs.
I couldn't possibly afford a car, though, or gas, or insurance,
or whatever else may be involved. Fobs. I can deal with
fobs as long as they aren't powered by magic. Oh, Henry!
Lazy,
You win a lifetime of very long-lifetime... batteries.
Not free batteries, mind you, just long-lifetime batteries.
I, apparently, only get half a lifetime of long-lifetime
batteries (the second half).
Swift,
Is that Dungeons and Dragons?
I was with some friends once, and finally asked them to let
me know when they were ready to start playing the game.
They replied that we'd been playing for the last 90 minutes.
It looked to me like they were just setting it up all that time.
-- Jeff, in Minneapolis
NEOWatcher
2011-Nov-21, 08:25 PM
NEOWatcher,
You prompted me to find a photo of what the fobs do look like:
http://www.facebook.com/notes/CheapHomeProducts22/Buy-Now-20012005-Buick-Century-Keyless-Entry-Remote-Fob-Clicker-With-Free-DoItYourself-Programming-Free-eKeylessRemotes/295847537100652
That looks even more like mine than the picture I asked you about.
I've wondered about how they were powered for a long time.
Recently the trunk has sometimes not been opening, and that
problem reminded me to finally ask.
Sounds like it could be a battery problem.
I can afford to buy new fobs.
So; if you mess up one of your current ones, then what's to lose? You'd be buying one and having to reprogram it anyway.
Next time you have one in hand, take a look at the seam between the two halves. On mine, it's less than 1mm wide. But; for about 1cm length it gets to be about 2mm wide and gets a bit deeper. Just enough to get a penny into up to Lincolns hair.
If you have something like that, then it's definitely made to be pried apart.
Swift
2011-Nov-21, 08:43 PM
Swift,
Is that Dungeons and Dragons?
Yes, the joke was a D&D reference.
HenrikOlsen
2011-Nov-21, 10:20 PM
You think? Is this someone elses key that you're trying to figure out, or don't you know what kind of car you have? :eek:
Isn't knowing the year just something car fetishists are into? Or is it a general USian thing that you guys think it's important?
HenrikOlsen
2011-Nov-21, 10:22 PM
NEOWatcher,
That photo doesn't look like the fobs. The car must be a 2001.
It was bought early in the model year. So it was bought in 2000.
That's the year I was remembering. Still over 11 years ago.
You prompted me to find a photo of what the fobs do look like:
http://www.facebook.com/notes/CheapHomeProducts22/Buy-Now-20012005-Buick-Century-Keyless-Entry-Remote-Fob-Clicker-With-Free-DoItYourself-Programming-Free-eKeylessRemotes/295847537100652
I've wondered about how they were powered for a long time.
<snip>
I'll just draw your attention to this quote from your link:
Every remote is tested prior to being shipped and Batteries are always included.
Van Rijn
2011-Nov-21, 10:33 PM
No, the year and other details of your car are important for maintenance, and it affects insurance and registration fees. I know the details about my cars. Other people's, not so much.
Laguna
2011-Nov-21, 11:00 PM
Has anyone here ever had a battery for more than ten years
that still worked? What type of battery could last that long?
I would expect that a small battery would have a shorter shelf
life than a large battery, because of the larger surface area-
to-volume ratio.
-- Jeff, in Minneapolis
Yes, the battery of my spare key for my old Renault did last longer than ten years. Eleven to be precise. I never used it until I sold the car.
In contrast, the battery of my four year old Mazda needs replacement in the immediate future. Its getting harder and harder to open the car...
Jeff Root
2011-Nov-21, 11:13 PM
I hadn't noticed the comment about batteries being included,
but I suspect that that paragraph is constructed from a generic
version with the car's make and model pasted in. The battery
comment might be there whether the remote has batteries
or not.
Any idea where in the car the antenna(s) is (are) located?
Especially for the trunk, since that is what has been working
sporadically.
-- Jeff, in Minneapolis
novaderrik
2011-Nov-22, 06:30 AM
Isn't knowing the year just something car fetishists are into? Or is it a general USian thing that you guys think it's important?
is that a Demnarkish thing, or do you no know that it's spelled "A-M-E-R-I-C-A-N"?
and why would you not want to know what year your car is? it's kind of important info to have when getting it serviced or adding varying accessories to it..
cjameshuff
2011-Nov-22, 07:38 AM
It shouldn't be that surprising that the battery lasts a long time...the vast majority of the time, no power at all is needed. Just a few seconds of low-power radio transmission a day under regular usage. Self discharge is probably the main limiting factor, and even the cheap lithium batteries are often rated for a shelf life of 7-10 years, and should often be good for such a low-demand application for a bit longer than that.
Jeff Root
2011-Nov-22, 08:31 AM
I guess it's ironic if it is (or even if it just could be) the battery.
Only a couple of months ago my mom called the cable TV
company for help, and went through a bunch of suggestions
without success. So an installer came and worked for over
an hour to locate the problem, without success. Finally he
suggested that she get new batteries for the remote. That
fixed it. Same thing with the car key remote, apparently.
-- Jeff, in Minneapolis
NEOWatcher
2011-Nov-22, 04:24 PM
Finally he
suggested that she get new batteries for the remote. That
fixed it. Same thing with the car key remote, apparently.
I don't know what kinds of trouble she had; but, I would think that most battery issues would be either obvious or the first place to go.
But; there are others.
I have a garage remote that started to work intermittently. I tried a new battery to no avail.
It had one of those buttons that press some kind of foil bubble. It seems to only work when I jiggle the button while I press it.
And; I had trouble with a TV remote that seemed like a battery issue but new batteries didn't help. I took it apart and cleaned all the contacts. Problem solved.
NEOWatcher
2011-Nov-22, 04:27 PM
Isn't knowing the year just something car fetishists are into? Or is it a general USian thing that you guys think it's important?
No; it's from ignoring the commas, and thinking you were referring to the entire description of the car.
But; yes. As others have mentioned, year is important for this very purpose. I know the years of my vehicles, but it does rarely come up. (a lot of my service is done at the dealer, and I rarely buy accesseries)
Radom
2011-Nov-23, 06:56 AM
Bottom right 'corner' area is the usual place to start opening the keyless entry transmitter for your Buick. They had stopped using the visually obvious, coin width opening slot by that time. You'll need to use something finer, like a pocket screwdriver. Push your pocket screwdriver tip between the transmitter case halves about an eighth inch & twist to start separating them. Move futher around & twist again until you get the case halves apart. If the battery & retaining clip fall out, it's broken. I've successfully soldered the clips back onto the circuit boards many times. Other times, the transmitters still don't work & have to be replaced. If it ain't broken, push on one of the buttons to remove the circuit board w/battery from the top case half. Wipe clean the contact surfaces of the buttons & circuit board. I've seen some truly nasty goop growing inside of these things. Depending, I suppose, on the average goop in the pocket of the feller carrying it the past decade. (eww! ;) ) Be careful to gently slide the battery out of the retaining clip as it is easy to break the clip off, if you pull up on it. Reassemble with new battery. If it doesn't work immediately, press & hold both the lock & unlock buttons for around 15 seconds to resync the transmitter & receiver. If it still doesn't work properly, you'll have to try a new transmitter to know for sure if the problem is with the transmitter or the receiver. Off the top of my head, I'm not sure if your Buick has a stand alone receiver, or if it is built into the body control module. Either way, the antenna (only one) is built into the module. If there was a problem with the receiver/module, it is highly likely you would have no keyless entry functionality at all. One of my favorite things (not) is the official GM transmitter tester. It beeps at you if it detects a signal when a transmitter button is pressed. However, just because a signal is detected doesn't mean it is the correct signal. So, transmitters can, and do, test 'good' when they are not good. Good luck and welcome to my life. :)
Jeff Root
2011-Dec-07, 09:28 PM
The little slot at the bottom right of the remote was obvious
once I looked for it. The edge of the physical key fit perfectly.
The owner's manual has a photo of the remote opened up,
and its battery is visible and large. I bought two replacements
at Radio Shack. They were a bit more expensive than I hoped,
but nothing like the cost of new remotes. Right after buying
them I found that the problem seems to be in the trunk opening
mechanism, not the remote. The trunk button inside the glove
compartment has stopped working, too. When the trunk button
on the remote is pressed, I hear a click near the glove box.
So the signal must be received by the car OK.
Amazing and astonishing to me that the technology has reached
the point where a battery can still work after eleven years of use.
-- Jeff, in Minneapolis