Author Topic: New key won't pair with the car.  (Read 5365 times)

sgould

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Re: New key won't pair with the car.
« Reply #15 on: 19 July 2019, 07:34:47 PM »
I do still have a cassette recorder.  I'll give it a try later.  I have to get it out of the cupboard.

As far as I'm aware, the remote works on radio frequency, not infra red.  So I don't know if a camera will help.


In the meantime I couldn't get a 1632 battery in either Poundland or Wilkos.  I tried a couple of "We can mend/unlock your phone" shops.  The second one had some in a box. I bought them on the grounds of desperation, but they are an unknown Chinese make and could be quite old.  Then I found a nice new battery in the Watch Hospital.  Of course, the Watch Hospital is the nearest place to the carpark, I walked past it yesterday without thinking ::)

Sadly, the new proper CR1632 battery has made no difference. :(
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carrera

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Re: New key won't pair with the car.
« Reply #16 on: 19 July 2019, 08:01:30 PM »

As far as I'm aware, the remote works on radio frequency, not infra red.  So I don't know if a camera will help.


I think the cameraphone is there to drive the RF receiver, unless I missed something on my brief look
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sgould

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Re: New key won't pair with the car.
« Reply #17 on: 19 July 2019, 10:25:06 PM »
The cassette player testdidn't work.  The player has a lid over the cassette, and when it's open everything is shut off. :(

However,  I found a really cheap plastic radio that came free with something.  I tried the 9-4 remote next to it and got a clear dull rattling sound coming through the earphones every time I pressed a button.

I had to change the tuning of the radio to a different weak station before the 9-5 existing remote would give an interference sound.  In this case it was a faint  whine each time I  pressed a button. But definitely caused by the remote.  Then I tried the new remote and got a similar sound, but  a biit louder, possibly due to the new battery.  So it seems to be transmitting.   But it still won't sync to the car.  All I can think of is that it's a 315 one.

Puzzling, unless I'm doing the marrying completely wrong.
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carrera

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Re: New key won't pair with the car.
« Reply #18 on: 19 July 2019, 11:05:46 PM »
This really is field repairs.

If you think the transmitters are on a different frequency then i would repeat the test you did, first with the working remote, and test what the upper and lower frequencies are that work and get a range. Simplicity would then make me take the midpoint as the actual frequency used

Repeat the test with the second key. If the range / mid point is the same it's a 433, if it's offset by quite a bit and it's lower it's the US frequency.

Does that make sense ?

I think the frequency band is located just above the old VHF tv signal (405 line) and just below the current UHF (was 625 line before digital)

https://www.itu.int/en/ITU-R/terrestrial/broadcast/Pages/Bands.aspx
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sgould

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Re: New key won't pair with the car.
« Reply #19 on: 20 July 2019, 10:41:40 PM »
I will try and play with a better radio tomorrow and see if I can get some harmonics to register.

Failing that, my plan is to take the keys with me to the Saabfest in Bury next weekend and see if there are any experts.  There may be some fundamental thing I'm doing wrong!! :o
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phoenix

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Re: New key won't pair with the car.
« Reply #20 on: 24 July 2019, 11:20:17 AM »
433MHz is just below the bottom of the UK TV Band IV frequency range (470MHz upwards). It's used in UK, Europe and the US.  The Japaenese models have the lower 315MHz frequencies.

You can check it if you have a newish TV and can set it to manually search for channels then if you were to scan on cable channel S37. Get a length of coax, strip approx 150mm of the braid off then set the TV it to look at S37 whilst pressing the remote near the coax. There's often a signal strength reading and you should see that change.

I've got a selection of spectrum analysers that could confirm but they're at work. If you wanted to post it to me I can check it.


sgould

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Re: New key won't pair with the car.
« Reply #21 on: 24 July 2019, 01:05:15 PM »
I may need to do something like that, but the first thing is to ask around at the Saabfest and check that I haven't done it all completely wrong.
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sgould

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Re: New key won't pair with the car.
« Reply #22 on: 26 July 2019, 01:54:05 PM »
Well the key is now working. :)

I took it to www.chrishamleysaabspecialist.co.uk this morning and he had a go and failed at first. But he tried to remarry the key, and on the fifth attempt the remote started working. He didn’t do anything I didn’t do. And he had no idea why it married the transponder, but couldn’t do the remote until the fifth go. 

But it’s working now.
« Last Edit: 26 July 2019, 01:58:41 PM by sgould »
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carrera

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Re: New key won't pair with the car.
« Reply #23 on: 26 July 2019, 04:40:57 PM »
Electronics are supposed to simple, eiither 1 or 0

So I suppose the moral of the story is if at first you don't succeed, try,try, try.try again  :)
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sgould

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Re: New key won't pair with the car.
« Reply #24 on: 27 July 2019, 10:33:57 PM »
The key has worked all day at Saabfest in Manchester.  But a note.  The new keys from Orio are unlike the original keys.  The original keys has a rubber coating.  The new keys are hard plastic all over and don't feel like a quality product.  It will probably last OK, but less style.
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