 | Home > Puma (Tdci) > Transponder confusion |
 
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| LandRoverAnorak Member Since: 17 Jul 2011 Location: Surrey Posts: 11324  
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No, you're not wrong. A Defender key is just a key. The fob does all of the talking with the immobiliser and needs a battery to work. Darren
110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak "You came in that thing? You're braver than I thought!" - Princess Leia |
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27th May 2021 8:15am |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17386 
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The push-button parts of the fob certainly need a battery to operate, but it is possible that the passive immobiliser function (the fob's response to excitation by the coil in the column) does not, but I've never tried that without a battery in the fob.
There is no doubt that the key itself is just an inert metal object. |
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27th May 2021 9:32am |
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| hank Member Since: 12 Sep 2016 Location: South Wales Posts: 2300 
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Years back on a work fleet freelander I changed the key battery and the transport fell out. On the freelander key the transponder is loose and not connected to the circuit board so certainly has no power supply. The below photo is not actually a freelander key but the best I could find online. The transponder is the small black plastic chip thing
 Click image to enlarge On the Defender the transponder looks to be attached to the circuit board in the key fob, but wouldn't need a power supply My original defender key broke where it attaches to a key ring so I replaced it with one of these and can confirm it is empty inside with no transponder chip.
The fob looks like this inside... Not sure which component is the transponder > 110 XS Double Cab |
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27th May 2021 11:55am |
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| macfrank Member Since: 05 Nov 2015 Location: somewhere in the north Posts: 1076  
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Thanks all. I hadn't thought about the possibility of a passive transponder inside the remote. I‘ll try when I‘m back home next week. Also interesting that Freelanders have a transponder in the key housing. That‘s maybe a source for some of the confusion.
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27th May 2021 12:45pm |
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| hank Member Since: 12 Sep 2016 Location: South Wales Posts: 2300
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Just had a look at my remote fob. I suspect the transponder is the bottom right chip from the above photo which has four pins connected to the PCB.
I have tested across all combinations of pins with a multimeter and found that there is no voltage to any pins so wonder whether these pins are just for mounting purposes? Although there looks to be tracks in the board beneath. Not sure, I am far from an electronica expert! > 110 XS Double Cab |
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27th May 2021 1:03pm |
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| macfrank Member Since: 05 Nov 2015 Location: somewhere in the north Posts: 1076
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ah, reverse engineering
sorry to dissapoint you but that component would be the oscillator crystal for the big IC. 
https://download.datasheets.com/pdfs/2004/...et132s.pdf With the „Lucas 3TXD“ on the board you can find photos and parts list on FCC database https://fccid.io/KHH17TN/Internal-Photos/New-PCB-Top-Photo-60998 https://fccid.io/KHH17TN/Schematics/Component-List-60997.pdf The crystal is X1 on the list, a 32.768kHz „T1-32S-A“. Google that and you‘ll get the datasheet with a picture. X2 by the way is the 315kHz resonator for the remote’s radio frequency.It‘s the silver square at the top left. Also no components on the list that could be a passive transponder. Would have to be a separate thing, if any. Now, is there any information about my MY15 fob...?  |
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27th May 2021 1:52pm |
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| dorsetsmith Member Since: 30 Oct 2011 Location: South West Posts: 4554 |
Would have to be a separate thing, ( if any.) none
The coil props key fob to transmit the code when both clos proximity |
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27th May 2021 3:57pm |
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