Dead Fob and starting car - Acura TLX Forum
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post #1 of 23 Old 05-20-2015, 01:26 PM Thread Starter
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Question Dead Fob and starting car

I have read in the owner's manual that if you have a weak remote (FOB) you can place it on the start button and be able to start the car.

What about if the FOB battery is completely dead?

Can the system read the FOB using some sort of RFID?

Has anyone tried removing the battery as a test to see if we can start the car without a powered FOB? With the actual key we can open the doors and lock the glove compartment, that's about it.

Just curious if I need to buy a spare battery.
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post #2 of 23 Old 05-20-2015, 02:25 PM
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I highly doubt it will work without a battery. Isn't the point that they are constantly pinging each other. The fob needs power for that, or at least to respond.
Its like trying to start a car with a dead battery...no power no boom boom
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post #3 of 23 Old 05-20-2015, 03:00 PM Thread Starter
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Originally Posted by Amnesia View Post
I highly doubt it will work without a battery. Isn't the point that they are constantly pinging each other. The fob needs power for that, or at least to respond.
Its like trying to start a car with a dead battery...no power no boom boom
I would find it odd that Acura did not have a viable solution. My car battery is recharged at regular intervals while my FOB is not.

A friend has a port in the glove compartment that he plugs his FOB into when the FOB battery is dead so he can start his car. It's a KIA. You would think Acura would have a solution that did not leave you stranded because of this one weak link. Also, RFID does not require power to work.


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post #4 of 23 Old 05-20-2015, 03:09 PM
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But if your car battery dies you have to replace it the car won't start. Same with the remote fob. These are bi-directional so they require power in both.
The old TL's had the option to put them in the dash like the kia's but it was pretty redundant which is why they removed it, why have a remote start vehicle that you still have to put in an ignition like slot?
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post #5 of 23 Old 05-20-2015, 03:29 PM
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Originally Posted by Amnesia View Post
I highly doubt it will work without a battery. Isn't the point that they are constantly pinging each other. The fob needs power for that, or at least to respond.
Its like trying to start a car with a dead battery...no power no boom boom
That's what I was thinking.

Most systems have been like this, once the battery in the remote is shot, that's it.

But like how key fobs for buildings work and tap on credit cards work, that could be the case here, i'd actually be surprised if that's not the case, easy tech to implement.
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post #6 of 23 Old 05-20-2015, 03:39 PM Thread Starter
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Originally Posted by Amnesia View Post
But if your car battery dies you have to replace it the car won't start. Same with the remote fob. These are bi-directional so they require power in both.
The old TL's had the option to put them in the dash like the kia's but it was pretty redundant which is why they removed it, why have a remote start vehicle that you still have to put in an ignition like slot?
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That's what I was thinking.

Most systems have been like this, once the battery in the remote is shot, that's it.

But like how key fobs for buildings work and tap on credit cards work, that could be the case here, i'd actually be surprised if that's not the case, easy tech to implement.
See this link -> Chrysler 300 Questions - how do you manually start the car when the key fob battery is dead? - CarGurus

The technology is possible. My credit card does not have a battery. Someone on another forum said his Lexus does this as well.

I really don't care about the car battery at this point. For this case consider the battery is working fine.

I may have to test this.


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post #7 of 23 Old 05-20-2015, 04:39 PM
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The only way to test it is take the battery out the fob.
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post #8 of 23 Old 05-20-2015, 05:09 PM Thread Starter
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The only way to test it is take the battery out the fob.
Thanks! Let me know how it turns out.


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post #9 of 23 Old 05-20-2015, 05:46 PM
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Thanks! Let me know how it turns out.
You laugh, i might acutally try it..but I might be afraid to destory that remote!
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post #10 of 23 Old 05-20-2015, 06:16 PM
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It appears as though the car will have an alert when the battery gets weak. Im guessing it will start the alert well before the battery actually dies. Now getting us procrastinators to change it while it's still functional is another thing.

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