: Program new car key fobs

06-09-12, 01:29 AM
Have had my car for 2 days & have not been able to program the key fob. Our salesman was a rookie & told us to go home & study the manual because he didn't know how to do it. I think I'm doing all the steps that the manual (very convoluted) but it's not working. Anyone have some simple steps to follow? Thank you, mmh

06-09-12, 02:00 AM
I bought a 3rd key fob and programed mine by using the manual... I can't figure out how to make the 3rd key as the second user though! All it does is open and start the car but I can't store any settings with it.

06-09-12, 02:19 AM
Only fobs 1&2 can have personalized settings stored with them.

Mark C
06-09-12, 08:25 AM
What year? Only the 97's and earlier Sevilles can be programmed by the owner, anything after that takes a Tech II to add a FOB to the car.

06-09-12, 11:32 AM
What year? Only the 97's and earlier Sevilles can be programmed by the owner, anything after that takes a Tech II to add a FOB to the car.

Not true at all. Keep trying to program per the manual, it took a few tries when I did mine.

If you want to make a replacement fob the No. 1 or 2 so it will work the remote start and the memory you need to clear all the keys and start programming from scratch. The manual covers that as well and it's posted here somewhere.

06-09-12, 01:10 PM
Better yet, go to the Sticky thread at the top of the forum and find the link to procedures that are more clear and explain the details.

06-13-12, 12:36 AM
If you have a programmed FOB place inside car, then take a key and insert in door, turn key 5 times to unlock within 20 sec this will activate programmer, insert key in center pocket with buttons facing front of car, car will program fob.

06-13-12, 08:59 PM
If you have a programmed FOB place inside car, then take a key and insert in door, turn key 5 times to unlock within 20 sec this will activate programmer, insert key in center pocket with buttons facing front of car, car will program fob.

This procedure is intended to add a new fob to the car; usually as #3 or #4, which aren't personalized. To start from scratch and match a fob as #1, #2, etc. ensure all known fobs are out of range (30 feet should do). then, put them in the center pocket in sequence. Just follow the relevant procedure in the Sticky.

04-08-14, 09:57 PM
Need some help with 06 STS key fob. My car came with 2 fobs. I have bought one from a forum member, Programed it as #3. Up till now all fob works. Fast forward two years I lost fob #1. No big deal I thought. Reprogram as per manual, Fob #3 is now #1. Fob #2 won't program. Installed NEW battery & tested them. So I reprogram again, still won't program. Taken both fob to an auto part store. They have a checker for fobs. Only fob #2 show a very weak signal. Could some how the fob went bad. Open the fob, check for dirt, any thing broken. Nothing is out of place. My question is, does fobs crap out like this. Can this be fixed. Any one have fob for sale. Danny

04-13-14, 04:33 AM
Sometimes the metal tabs that make contact with the battery get dirty, corroded or bent. Baking soda & water is a good mild cleaner. Don't use anything more abrasive than a pencil eraser. Energizer & Panesonic (rare) batteries are the best according to the manufacturer data sheets (on a site dedicated to the CR2032 battery).

I have a new-style fob as my #1. It takes a bit of handiwork to fit a first generation key to it but it's rewarding.

04-13-14, 10:31 PM
Thanks EChase3, I have checked, cleaned all metal tabs that connect to the battery again. The battery is a new Rayovac & tested 3.30 volts. Also cleaned the connect points where the buttons hit. Stop by the auto part store to use their fob tester. Now fob #2 shows strong signal. Guess what? Can't get it to Program. Oh well, back to the drawing board. Danny

04-14-14, 02:35 AM
When programming fobs, do you keep all fobs out of range of the car until requested by the procedure? If any fobs that have been matched to the car are within range, the procedure reverts to #1 (like it says in the manual & my write-up.)

I once tried to see if it was possible to match the same fob to two cars simultaneously. It would be cool, but no dice. The procedure changes BOTH the fob & the car.

It sounds like your work on your fob may have corrected much of the issue. Now, it could just be the procedure.

Be advised that there is more to testing a battery than a volt reading. Current under load is the correct metric. The typical load for testing small batteries in the range of 1.5 to 9 volts is 0.370 Ohms. Most VOM's (volt-ohm-meters aka multi-meters) have a setting for this that yields 4.5 mA for a new top-quality alkaline dry cell such as the Energizer. Their Lithium-ion AA cells score 5.0 on my meter.

Don't ruin a good meter intended for small batteries by trying it on your car's big lead/acid battery. Load testing it does require special tool. Many of the free battery tests provided by parts stores are worthless. More often than not, one must pay to receive something of value.

04-25-14, 08:44 PM
Up date on my fob problem from post #9. I stopped by a local GMC/Buick dealer today. The service tech with a tech 2 tool tried to program fob #2 back as #2 after I Deleted all fob per my Cadillac manual. He couldn't Program the fob. He stated this has been a known fob and can't be reprogram to the same car. Only one known fob can be program. So I order a brand new fob. The service tech said Had I Came to him to first he could have reprogram the fob and renumbered them. Danny

04-25-14, 10:19 PM
False. I've done it using the procedure in the manual; several times.

The fob may be defective.

04-25-14, 11:04 PM
I watch the service tech test both fob. Both checked out OK. Danny

04-25-14, 11:40 PM
Yeah but what he said doesn't check out. You can reprogram a known fob as long as you have another known fob. And he can program any fob, whether you have a known fob or not. If both "checked out ok" why the need to buy another fob??

04-26-14, 09:42 AM
Some thing is fishy. Maybe when the new 2nd fob is programed I will try to add this so called bad fob as #3. This will be next Tuesday or Wednesday. Danny

04-26-14, 11:19 PM
You don't need ANY known fobs to program fobs to a domestic market STS. Or, some can be known and some unknown. You can even take known fobs and start over and reprogram fobs that have been previously matched to your car as different driver numbers. It's all a matter of following the procedure or subroutine .

The one thing you can't do is take the four fobs from two STS's and match all four with both cars. I tried. The matching procedure changes both the fob and the car.

It is interesting that a car 'remembers' a fob that was previously matched to it. And if that fob is within range of the car during a 'start-over' procedure before it is actually called for, it will corrupt the subroutine. To use a phrase common in my line of work, "Your results will be uncertain."

04-27-14, 12:35 AM
EChase3 and others, Thanks for all the info you have given me on fobs. Fob #2 was my wife's. It has always worked for her. I tried 2 time to do the 30 min. Both time only what was fob #3 is now #1. Her fob wouldn't reprogram. Then I tried to just add her fob on the short program. On the car dash it would read READY FOR FOB #2. No chirp and would timed out. In time we will all learn on this. I wish some one with a STS lived close by so I could do some testing. Danny

04-27-14, 10:21 AM
Did you keep that fob over 50 feet away & behind walls (like in the house) until the car displayed READY FOR FOB #2? That's what I mean by 'out of range'.

04-27-14, 11:52 AM
EChase3, Yes I keep the fob more than 75' away at the other end of the house from the garage. Danny

Cadillac Cust Svc
04-27-14, 08:11 PM
Hello dannyquest,

I apologize that we did not reach out previously, but I am happy that your local dealership was able to assist you with getting this addressed. If anything should change please do not hesitate to reach out via private message.


Jonathan A.
Cadillac Customer Care

04-29-14, 05:13 PM
More update on fob issue. Just arrived home from Haydocy GMC/ Buick dealer. This dealer is 4 miles from home. The Cadillac dealer is 25 miles thur town. That is why I chose Haydocy. The new fob I bought programed as #2 in just seconds. The service tech tried to match my wife's fob back in as #3, no go, nothing. Yet on the fob scanner it show ok. Tech stated this could be program to a different car. I was told if I were to do the 30 min. reprograming only one fob would work. Then I'll be back to buy another fob. I just got off the phone with Gremain Cadillac dealer service dept, he stated, never heard of this. He will call me back tomorrow after more research form other techs. Danny

Cadillac Cust Svc
04-30-14, 12:09 PM
Hi Danny,

Thank you for keeping us updated. Once you hear back from your dealership, please let us know. Like Jonathon previously mentioned, don't hesitate to send us a private message to further discuss anything.


Laura M.
Cadillac Customer Care

04-30-14, 09:00 PM
Here the deal and fob update. Germain Cadillac call back this afternoon. In order to add a third fob, They would use a tech 2 tool to scrub all data from the CBM. Then down load a clean program. Reprogram the fob back in, up to 4. The service tech stated they have done the before. Takes about 3hr. This can be done at a price. Here it come------ wait for it, $337. Plus a third fob. Don't you love the CADILLAC TAX. At this time two fob will do for now. I have placed a phone number on the back of all fob that I own in case I lose one. Are other brands of cars have these same problems. Danny

05-01-14, 12:41 AM
I know some imports have remotes and keys that make ours seem cheap.

I still contend that fob is simply defective; replacements only cost around $100. Even the new-style fobs and fashioning a copy of the hard key to fit inside won't cost $330. Wow!

I'm glad to hear that you are back in business with two fob's.

05-01-14, 05:04 PM
Recap on fob issue. As the service tech at Haydocy GMC/Buick said he could add a third and forth NEW fob with no problem. Germain Cadillac wants to scrub all data so I could use all fobs including my wife's fob that doesn't work. Wife's fob can be program to an unknown car. Since it will be cheaper to buy a new fob than reprogram the computer I will let this go. Any one on Cadillac forum need an extra fob from my 06 STS. I tried to state every thing that has happen to me so other will learn. Danny

05-01-14, 07:01 PM
Why can't you just program it on your own ???

05-01-14, 10:58 PM
Once I done the 3-10min program to remove all known fob, only the first fob would work. Couldn't get the 2nd fob to program. That when I called the dealer. I found out only one known fob would be reprogramed to the car. A brand new fob will be needed. Bought the fob and the dealer programed it at no cost. They done the ad a fob as in my manual. I have been told by the dealer the extra fob can be programed to a different car. Well it come down to I was about to have a car in my garage that I couldn't start. You know a 4,000 pound boat anchor. Danny

05-05-14, 08:04 PM
I agree the process in the manual is imperfect. When I was experimenting (and glad I didn't turn either car into a large brick) I found that even though the matching procedure changed both the fob and the car, a fob that was once matched to a car, never fully 'forgave' its first 'love'.

05-05-14, 08:13 PM
EChas3, I hope didn't have to buy a fob like I did. Danny

05-09-14, 08:19 PM
Thanks, no. I had no trouble at all. I didn't achieve the result I'd hoped for, but didn't do anything worse than force myself into a learning experience. That wasn't the first time and probably won't be the last. I'm no more intelligent than I was when I was younger; I just learned one more of those things that don't work as hoped.

I still contend that despite testing good, there's something wrong with that fob.

05-09-14, 11:17 PM
Looking for some one to try and program it to their car. Danny.

06-16-14, 01:21 PM
Lost #2 keyless fob for 2006 Cadillac - purchased new fob from GM dealer, but need "mechanical key" to insert in door to program new fob. Where is this key as it is NOT in the #1 keyless fob?

06-16-14, 10:04 PM
Looks like this.


Should've come with your car. One for each fob.

06-17-14, 08:10 AM
Unless something has changed, our 2005 and up STS does not require a chipped/transponder key. You should (make that must) have a physical key. There is no way into the car if the car battery fails or fob malfunctions other than trying to jimmy the door or window. The 2008 and up have the key hidden inside the fob. The 2005-2007 have the key attached to the fob. You need the key.

06-18-14, 12:47 AM
Correct. Many places that copy keys believe a 'chipped' GM key is required, but a cheap blank works fine. (I modified a copy to fit inside a new-style fob so my key ring has only a couple of keys and that fob.)

If you have none, your best bet is a dealer, your VIN & proof of ownership. A good locksmith can handle the work, but I'd check with Chris Heath at Rippy's or your local dealer.