Acura TLX Forum banner
1 - 20 of 25 Posts

·
Retired Moderator
2021 TLX
Joined
·
2,334 Posts
Discussion Starter · #1 ·
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. :)
 

Attachments

·
Registered
Joined
·
423 Posts
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
 

·
Retired Moderator
2021 TLX
Joined
·
2,334 Posts
Discussion Starter · #3 ·
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.
 

·
Registered
Joined
·
423 Posts
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?
 

·
Registered
Joined
·
727 Posts
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.
 

·
Retired Moderator
2021 TLX
Joined
·
2,334 Posts
Discussion Starter · #6 ·
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?
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.
 

·
Premium Member
Joined
·
4,998 Posts
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.
 

·
Retired Moderator
2021 TLX
Joined
·
2,334 Posts
Discussion Starter · #11 ·
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.
I understand the feature about the weak FOB battery, but would really like to find out if we can still drive with a dead FOB.

Understandably you should use the alert to make a battery change, but I was wondering if the FOB battery drained down to nothing, would it be useful. I always wonder if the buttons can become activated while in my pants' pockets without me knowing about it. Hmm. Maybe a haptic FOB is in order?

From what I have read, the technology is out there and in use on some cars.

If anyone tests this feature by removing the battery, I would be curious to see if you got it to work. It would be nice to know we have this feature.
:)
 

·
Registered
Joined
·
144 Posts
According to the manual there are actually two batteries in the FOB. One is a non-changeable, rechargeable battery and the other is a common button battery CR2032. If the 2032 is allowed to die then irreparable damage can happen to the other battery. Book recommends that the 2032 be replaced every three to four years.:| I suspect that most of the active power for the FOB must come from the rechargeable battery and the 2032 is used to recharge that battery as I could find no information on recharging the permanent battery.:|
 

·
Registered
Joined
·
423 Posts
Ok, so. I didn't test it myself but I did one better.

Managed to speak with the guy that is the trainer/product specialist for Acura Canada this morning. Asked him about this and how it works.
If the battery is totally dead then it WILL still start the vehicle. As stated before if you hold it close to the button it will still start even if the fob can't communicate with the vehicle.
Apparently it uses some non touch form of power, so the fob being close to the button means the fob takes charge without touch and is able to communicate with the car (i didn't write down the proper term for this tech!).

I don't know if we are going to get a better answer than this, this guy is the product guru for Canada. But it is the answer most are looking for.
 

·
Retired Moderator
2021 TLX
Joined
·
2,334 Posts
Discussion Starter · #14 ·
Ok, so. I didn't test it myself but I did one better.

Managed to speak with the guy that is the trainer/product specialist for Acura Canada this morning. Asked him about this and how it works.
If the battery is totally dead then it WILL still start the vehicle. As stated before if you hold it close to the button it will still start even if the fob can't communicate with the vehicle.
Apparently it uses some non touch form of power, so the fob being close to the button means the fob takes charge without touch and is able to communicate with the car (i didn't write down the proper term for this tech!).

I don't know if we are going to get a better answer than this, this guy is the product guru for Canada. But it is the answer most are looking for.
Great news. Thanks @Amnesia.

I plan to test this in the future when I have a slow weekend. :)
 

·
Super Moderator
Joined
·
1,007 Posts
Keyless Access Remote Battery Strength
If the battery life in your keyless access remote is weak, a message appears in the MID with information on how to start the engine.
1. Touch the back of the keyless access remote to the ENGINE START/STOP button while the indicator is flashing.
2. With the brake pedal pressed, press the ENGINE START/STOP button within 10 seconds.

Owner's Guide, p98
But only states "If the battery life in your keyless access remote is weak"

I'll be looking for the results of your test!

Also, looking in all the Manuals/Guides, nowhere does it explain HOW to change the battery!!
 
  • Like
Reactions: Summest and typeess

·
Registered
Joined
·
727 Posts
But only states "If the battery life in your keyless access remote is weak"

I'll be looking for the results of your test!

Also, looking in all the Manuals/Guides, nowhere does it explain HOW to change the battery!!
Should be too hard, might be a screw like most that's required to remove a back cover. But yeah it's funny that for something so basic and common to come across...it's not even in the manual.

Seems like they want you to go to the dealer.
 

·
Registered
Joined
·
1 Posts
I have the same fear as you about the key fob and battery. The dealer assured me the batteries should last two years and nothing to worry about. Like you, I have been thinking about putting a spare battery in the glove compartment.Thanks Fort Launderdale Locksmith,they show how you can start car without the battery in the fob.
 

·
Registered
Joined
·
238 Posts
Ok, so. I didn't test it myself but I did one better.

Managed to speak with the guy that is the trainer/product specialist for Acura Canada this morning. Asked him about this and how it works.
If the battery is totally dead then it WILL still start the vehicle. As stated before if you hold it close to the button it will still start even if the fob can't communicate with the vehicle.
Apparently it uses some non touch form of power, so the fob being close to the button means the fob takes charge without touch and is able to communicate with the car (i didn't write down the proper term for this tech!).

I don't know if we are going to get a better answer than this, this guy is the product guru for Canada. But it is the answer most are looking for.
So based on this specification, I see two possible explanations to how this could work but there could be more:

(1) RFID -- e.g., something behind the start button interrogates the RFID inside the FOB and based on the resulting response, the car knows it matched. To be clear, active RFID tags generate their response using their own power, while passive RFID tags do not need their own power and simply respond based on the power of the signal of the interrogator. sample link further below

Active RFID vs. Passive RFID: What's the Difference?

(2) induced power transfer -- e.g., similar to wireless charging of cell phone and other devices, perhaps they set up a simple coiled wire transformer type setup and induce power in a circuit in the FOB. Given the very low power demands, this would not be hard to do.

Given how many cars are starting to offer wireless charging of phones, I do wish they'd add FOB charging to it too. Or at least a micro-USB to my FOB to charge it. I'll leave it to the imagination of this forum on what to name this new feature
:)
 
1 - 20 of 25 Posts
Top