Thanks a lot Mailshack, perhaps the numbers 3-1-5 should have given me a clue!
I was totally convinced that I had a 433 unit as my old remote which broke was I am sure a 433 as I checked the printed circuit. But clearly I was wrong. Wish I'd kept the old one now just to check it again.
No wonder my attempts to programme my 433 remote to the car have failed!
Now I'll have to sell my 433 and find a 315.
Anyone want to swap a 313 for 433?
Once again a big thanks to you and all the others for taking the trouble to help.

 

Hi,
I am quite sure, that also the 315MHz version is labeled FM433... on the pcb.
So don't let this confuse you. I am not 100% sure, but a better hint might be the marking on the bigger black component just below one of the battery contact soldering pads. I think it is a filter element, which is usually different btw. both versions. I saw marking either saying 100 or 101. Maybe you could check this or maybe somebody else could verify?

 

Thanks again for that but really sorry to say, my confusion only deepens!
Leaving aside why a 315MHz remote would be labelled 433 on the pcb, can you explain the second part please.
I think I know where you mean and I assume the filter is an electrical rather than a mechanical filter, but is it the one near the battery terminal and if so, what connection has this unit with the SLCM?
Finally, back to the remote, how can the frequency ever be verified if both versions have FM433 on them?

 

Sorry biffta, I was talking about the remote itself. When you open it the way you did, you saw the labeling FM433... If you hold the remote in the way that you can read this text (it's located on the bottom then) and you look 1.5cm "North-East" of the text, you will see a component labeled with a number "100" or "101". I believe (but not sure), that 101=315MHz and 100=433MHz.
Normally the correct frequency should be written on the housing, but you never know...
Sorry for this description, but I cannot add a picture yet.

 

No need to apologise turbo I should have realised you were taking about the remote.
Anyway, did as you suggest and the number is.....................101. Which might (does?) mean that my remote is a 315.
That depresses me now as it means I have a 315MHz SCLM, a 315MHz Antenna and a 315MHz remote and yet the car won't learn.
So perhaps it's one or more of the following:-
A faulty remote.
A 'full' SCLM.
A faulty SCLM.
A combination of all 3!
Big thanks anyway.

 

Look at the back window, there is writing in the center, telling the frequency, remotes on different freq wont work.

 

Thanks Ronnie, already checked it and apparently it's a 315mhz antenna. As I said previously, I have checked and my SLCM is 315Mhz and according to a previous posting my remote is a 315 also. But I've no way of checking this out as there is no label anymore on the back of the remote. According to Turbolag, on a component on the PCM the numbers 101 or 100 indicate the frequency of the remote. He believes 101 = 315MHz which is what mine says.
Some time back when I bought a 'new' remote via eBay, I didn't check what MHz it was as I didn't know at the time that there were 2 different frequencies. Checking those for sale now indicates that they all seem to be 433MHz. 315MHz remotes seem very rare so I think the one I bought has a good chance of being 433MHz but I don't know.
BTW can't understand why the figures FM433 aren't a good indication of the frequency of the remote. Surely they must be, but if mine (according to the number 101) is a 315, then why is FM433 written on the PCM?
Would be very useful if someone who has a 315MHz remote would open it up and confirm once and for all what's written inside!
Very confused!
Thanks again Ronnie.

 

I just opened two X300 remotes, one of each part number [frequency]:

DBC11510 = 315 Mhz
DBC11512 = 433 Mhz

Each had the part number on the exterior case. Both internal circuit boards had "FM433.000" written on them. I guess that can be tossed out as being anything meaningful.

Cheers,

 

Thanks a lot XJRguy really appreciate you taking the trouble to do that - BUT, where do I find the DBC numbers you quote? Looking at the circuit board I can't see anything resembling those letters and digits!

 

You may not see the part numbers. If they are there, it is either printed [in silver] or embossed on the battery cover. Some just have a flat circle there, in which case leaves you with no way to tell which is which.

 

Those figures or anything similar are definitely not printed on the circuit board. As for the battery cover, I presume you mean on the inside of the cover as there are none on the outside. Inside the cover, "JX300.03-", below which is "10.03-" below which is "PA6-6F30".
Guess it will have to remain a mystery as which one I've got!
Makes finding a 315 difficult as when I've asked one or two sellers who don't specify the frequency they are selling, which frequency it is, they ask "How do you tell?". Seems to the case that I can't really advise them with any certainty, just hope they know that if they believe they're selling a 315, then it really is one!
Thanks again very much.

 

Here is a pic of the two remotes showing the part number and frequency markings. If there is nothing on the outer side of the battery cover, I guess we can't determine the frequency except by programming and see which one takes.

Someone has also thought that a 100 or 101 written on a chip might tell one from the other. Well I have checked for that as well, and I have chips marked 100, 101 and 113 in 3 remotes. I guess that's a non-starter, too.

Whew!!

 

Thanks Steve, the pics explain everything!
Funny, I've had two other remotes in the past and I don't think any of them had lettering etc embossed on the battery cover. But as I've not got them anymore I can't be sure. There are some references to a white paper sticker with the same information being in the same position on the battery cover, but I'm sure they must be easily rubbed off in general usage.
Oh well, at least I'm a little wiser than before which is always a good thing eh?
Thanks so much again for the time and trouble.

 

My '95 XJ ending in C737551 is 315 per XJRguy's post above. FWIW, Biffta, I never realized there was info on the battery cover until I saw his pics.

 

biffta, you could try to find somebody working about electronics and having access to a frequency analyzer. he could check 1. if your RF is transmitting at all and 2. which frequency.

 

Thanks Turbolag, the same thought has occurred to me as a solution to the question of which frequency is being transmitted. The problem is that in my relatively quiet coastal area of Spain I wouldn't know where to begin to find someone to do this!
Even when I lived in the UK I wouldn't immediately know but perhaps I could find one.
Now you have mentioned the idea to me again I will make some enquiries as there must be someone who has the equipment to cary this out quite easily I would have thought.
Thanks again.

 

biffta, just thought I'd let you know you're not the only one struggling with this. I just bought one from a seller on eBay who proactively listed it as a 315 MHz unit. Let's hope it really is......

 

I really is pretty ridiculous that the remote doesn't have something firmly affixed to it (not a paper sticker!) either on the back of the unit or behind the battery cover or some marking stamped into the casing indicating its frequency.
Some time back when I was on a search for a remote and came across this problem I thought I'd found the solution whereby 433 was marked on the printed circuit. Sadly I discovered that it's on all the circuits irrespective of the actual frequency!

 

is it at all possible to unplug this unit and install a 2 way/pager alarm such a Compustar or Viper?

 

I am missing the backing on my remote, but after I opened my fob it says 113. I too am still confused as to truly tell what my remote is.