The key fob door lock transmitter on these cars has a label on the battery cover that notes the frequency and a FCC identification number. I attached a picture of a replica I made to replace the lost label on mine. I copied the text from a X300 fob with the label intact. This is the question:
Is the frequency and FCC data the same for all of these devices for this series of cars? It's just a minor detail that doesn't matter much; I'd just like to be correct if I'm going to duplicate the label.

 

There was 2 frequencies during X 300 production

You have an example of the later Freq

See TSB below

18-12 (jagrepair.com)

 

Oh, I see. I have that TSB; didn't think to look at it. Do you think the earlier 315MHz cars change only those digits in the label data? Does anyone have a fob with the 315MHz frequency? Are the rest of the characters the same?

 

Mine and probably the majority are 315

Just picked up a X300 FOB from a salvage yard for 3 bucks

Gotta learn how the full shell comes apart to see the freq as the battery cover has no labeling inside or out

The numbering is raised lettering on my other 315 fobs / I'll have to check

 

G'day Parker,

The shells just pop apart if you insert a thin blade between the brass ring and the shell half and gently prise it

Cheers,
Jeff.

 

 

John, very nice. Thanks. It looks like they were more sure of what to do with the early cars; the numbers molded into the cover. Is your car Canadian or do you think the Canadian number is on all the North American cars?
Niles

 

The FOBs manufacture has to do with the Government's regulations

For example, without knowing the details an Canadian 315 can have a frequency bleed over of 5 % but a American is only allowed a bleed of 1 %

So the American must be manufactured and tested with tighter tolerances

So you would expect different Jaguar part #s

See item # 6

Genuine Security System For Jaguar Xj 1995 - 1997 (from 720125 To 812255) Classic | Jaguar Land Rover Classic Parts

 

From a manufacturing perspective, the smart thing would be to build and test to the tighter US requirement which will of course satisfy the Canadian requirement. Then it's not necessary to differentiate the devices, and the labeling can be as shown on the sample above. Perhaps logic prevailed on this minor aspect of the car.
When the 433MHz device began to be used, the marking was an adhesive set label, a duplication of which is shown further up in this thread. Likely a production expedient that allowed the same cover to be use for all versions. Easier to localize the text as well.
In pursuit of trivia...
Niles

 

Ah. In the link posted by Parker 7 I can only two part numbers buried in all the applications. DBC11510 for the 315MHz device and DBC11512 for the 433MHz device, irrespective of the locality. Excepting Japan and Hong Kong with an entirely different part number. I'll go with the notion that all the devices satisfy the most stringent requirements and it was less costly and provided better utility to remove the text insert from the mold and replace it with a frequency and locality specific adhesive label.
Niles

 

My newly acquired 3 dollor X300 FOB is a 433 with the circuit board marking

No sticker on the battery cover , must have worn off

The other 2 FOBs are 315 with raised lettering on the battery cover

 

Does that mean the $3.00 fob has the same value to you as a $3.00 bill?

 

Referencing the TSB 18 - 12 linked above maybe the 433 will work , just need to program it

one of my first two 315 FOBs has some corrosion going on sitting on bathroom sink while taken apart

Quoting the TSB

" While the SLCM and rear glass antenna do not need to match, the key fob transmitters and the SLCM must be the same frequency. A key fob transmitter of one frequency will not function with an SLCM of the other frequency. "

 

I don't know. The way I read that bit is that the Security and Locking Control Module (SLCM) has to match the transmitter, but either antenna will work. So the 433 device should work with the 315 antenna, but the signal won't be received by the 315 SLCM.

 

Yea that's it , so have to look at the label on the SLCM to be sure of it