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Programming a new key fob for 1997 GMC Sierrra #4482941
08/08/17 04:51 PM
08/08/17 04:51 PM
Joined: Mar 2003
Posts: 3,518
Colorado
Chris B. Offline OP
Chris B.  Offline OP
Joined: Mar 2003
Posts: 3,518
Colorado
I just bought 2 new factory GM key fobs for my 1997 Sierra. I programmed them using a paperclip inserted into the port under the dash in the 4 and 8 slots. Then hold down the 2 buttons on the remote till the lock cycles. Worked perfectly but the problem is once I program one fob and then go program the 2nd fob, the 1st fob no longer works once the 2nd fob has been programmed. I tried back and forth several times with the same results. It seems the truck will only learn one fob at a time. Is there a way to get both fobs working at the same time? Many thanks!

Re: Programming a new key fob for 1997 GMC Sierrra [Re: Chris B.] #4482949
08/08/17 04:59 PM
08/08/17 04:59 PM
Joined: Feb 2013
Posts: 11,095
Phoenix, AZ
Nick1994 Online content
Nick1994  Online Content
Joined: Feb 2013
Posts: 11,095
Phoenix, AZ
Was it just the plastic and rubber worn out on your old fobs?

If so just swap the insides to the new cases


2015 Hyundai Sonata 2.4L 88k Motorcraft Synthetic Blend 5w30 & OEM
2000 Toyota Camry 2.2L 231k Valvoline 5w30 & Fram Ultra
1996 Jeep Cherokee 4.0L 147k Mobil 1 HM 10w40 & Fram Ultra
Re: Programming a new key fob for 1997 GMC Sierrra [Re: Chris B.] #4483012
08/08/17 06:12 PM
08/08/17 06:12 PM
Joined: Sep 2013
Posts: 10,687
Indiana
dlundblad Offline
dlundblad  Offline
Joined: Sep 2013
Posts: 10,687
Indiana
I'm curious what made you buy new? Mine don't work unless I'm near the driver side door even with new batteries.


03 Jeep WJ 4.0 202k Castrol Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 186k M1 0w40 Mahle OX149D
97 Chevy Blazer 4.3 153k Synpower 5w30 Supertech ST3980 (Ecore)

Re: Programming a new key fob for 1997 GMC Sierrra [Re: Chris B.] #4483136
08/08/17 08:21 PM
08/08/17 08:21 PM
Joined: Feb 2009
Posts: 17,298
Michigan
daves87rs Offline
daves87rs  Offline
Joined: Feb 2009
Posts: 17,298
Michigan
Been wanting a few new remotes for my chevy Cobalt, but I have been told that they have to be programmed at the dealerships...

not sure if the 4 and 8 slot thing would work for mine...


Coming together is a beginning; keeping together is progress; working together is success.

Henry Ford
Re: Programming a new key fob for 1997 GMC Sierrra [Re: Chris B.] #4483244
08/08/17 11:23 PM
08/08/17 11:23 PM
Joined: Mar 2003
Posts: 3,518
Colorado
Chris B. Offline OP
Chris B.  Offline OP
Joined: Mar 2003
Posts: 3,518
Colorado
I bought the vehicle used quite a few years ago and it only came with one almost worn out key fob. It finally stopped working even with new batteries so I bought two new ones. I programmed the first one like I said and it worked fine till I program the second one and then the first one stopped working once I reprogrammed the second one. Then the second one worked just fine but then the first fob stopped working . This went on a few times and I gave up. So it appears that only one key fob will work at a time.

Re: Programming a new key fob for 1997 GMC Sierrra [Re: Chris B.] #4483283
08/09/17 02:28 AM
08/09/17 02:28 AM
Joined: Mar 2003
Posts: 3,518
Colorado
Chris B. Offline OP
Chris B.  Offline OP
Joined: Mar 2003
Posts: 3,518
Colorado
I figured out the problem. You have to program both fobs back to back at the same time without stopping. If you remove the paper clip from the terminals at any point you have to restart. It worked perfectly and now both fobs work perfectly.

Re: Programming a new key fob for 1997 GMC Sierrra [Re: daves87rs] #4483387
08/09/17 06:36 AM
08/09/17 06:36 AM
Joined: Sep 2006
Posts: 116
Idaho
CorvairGeek Offline
CorvairGeek  Offline
Joined: Sep 2006
Posts: 116
Idaho
Originally Posted By: daves87rs
Been wanting a few new remotes for my chevy Cobalt, but I have been told that they have to be programmed at the dealerships...

not sure if the 4 and 8 slot thing would work for mine...


Primarily works with pre-serial bus and some GM serial bus vehicles. I think all are gone by GMLAN vehicles.


Jerry
Re: Programming a new key fob for 1997 GMC Sierrra [Re: Chris B.] #4483424
08/09/17 07:38 AM
08/09/17 07:38 AM
Joined: Nov 2004
Posts: 7,806
Texas
GMBoy Offline
GMBoy  Offline
Joined: Nov 2004
Posts: 7,806
Texas
Originally Posted By: Chris B.
I figured out the problem. You have to program both fobs back to back at the same time without stopping. If you remove the paper clip from the terminals at any point you have to restart. It worked perfectly and now both fobs work perfectly.



You beat me to it. That is how you do it.


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