Ok, I've done some searching on this and I'm only finding threads about upgrading to the switchblade key fob.

So I get up this morning and my 2004 stock key less entry fob doesn't seem to open the car. I figure its the battery, so I swapped a new one into the unit. Still no workie. My other fob also appears to have a dead battery, so I swapped it out too. No luck on getting that unit to open the car either.

Do you have to reprogram after you simply swap a battery? Thanks guys

 

Hi Brillo.

That sucks.

As far as similar problems, I found this post by dannobre:

You might want to PM Dan and see what he found after the fact.

Good luck.

 

Nothing much..it was cheaper to get a couple from e-bay and re-program those.

Some day I will try and figure out what's up with them...I think they just quit working

 

just buy some new switch blade keys and get them programmed- thats what i intend to do very soon

 

^^ same thing happened to me; thought it was just the battery but no luck. i'm saving up for the switchblade, but going on 3 or 4 months now of just using the key sucks when my gf is with me!

 

so do you have to reprogram when you replace the battery?

 

i don't know, but i guess that sounds like it might work. i didn't expect to need to do that, but i never tried...

 

I tried that and it didn't work for mine.....worth a try though

 

I think you do need to reprogram when your renew the battery.....

Taka has an easy Thread here on how to do...

 

alan.

sorry i missed you call.. but try to reprogram..

i know that when i did my one key no fob, both of my old fobs did not work any more.. and that was like two years ago.. i doubt the batterys died..

beers

 

You should not have to reprogram after changing a battery. The Fob simply transmits an embedded unique number code that the car electronics has recorded as valid. Changing the battery should not alter the code that is transmitted. I doubt the fob is sophisticated enough to be sending anything complicated like the rolling codes of a garage door opener. Make sure the battery is in correctly and any connections are clean and unbroken.

 

I think when you re-program the new key you have to have your old ones handy to re-do ALL at the same time....probably because a new code is issued, so the old code will no longer work in the keys that you thought were OK.

 

i agree,

and btw allen. i have an extra fob.

beers

 

This procedure worked for a lexus, it's free and worth a shot:

1] Stand within a couple feed of the car

2] hold the lock and unlock buttons down for 15 seconds or until a click is heard.

I hope it works for the 8

 

I agree lol same feeling when I need to open the door for a girl and oh! Surprise!

 

Hello I. Just got a rx8 the alarm system and keyless doesn't work for some reason I changed the battery and nothing... I was thinking about get a keyless alarm system is that a good idea any brands of system??? I read somewhere than if I install any alarm keyless system on my rx8 I can get some problems and my car can keep shutting off??? I hope u guys. Can Help. Me. Thank you so much

 

What year is your car? If you own a 2004 and uses the keychain FOB, you will: 1. Need to have the dealer program the FOB. OR 2. Buy a switchblade (like the one from eBay linked below) and follow the programming instructions for the Switchblade FOB.

MAZDA SWITCHBLADE KEY/FOB

I have tried Takahashi's versions of programming the FOB for the 2004 RX-8 and niether worked. It did on the switchblade, however. The only sure way of reprogramming the 2004 FOB when the battery dies is through the dealer using the Mazda-Modular Diagnostic System.