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The infamous ELM327 OBDII device came without any paper, just a crappy CD with no document related to the device (only some software and drivers thrown on the CD almost randomly).

I tried the following codes without being able to pair it with my HTC Desire HD:

  • 0000, ..., 9999
  • 1234, 2345, 3456, 4567, 5678, 6789, 7890

What other PINs should I try?

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so, which one was it? 1234 or 0000 or 1111 or maybe 6789? –  user2747 Feb 11 '13 at 18:40
    
My code was 6789 for standard ELM327 OBD 2 chinese bought on EBay. –  user2839 Mar 6 '13 at 2:01
    
none of the above worked for me, still searching –  user2859 Mar 9 '13 at 22:29
1  
It seems that the correct code was already one of the listed ones, still there is a trick: it seems you are able to put the PIN code only one minute after the device was powered. Unplug it and try again, preferably with a computer. Don't try iPhone as it will not work. –  sorin Mar 11 '13 at 9:44

3 Answers 3

up vote 2 down vote accepted

Is it the one pictured at the Elm327 Bluetooth website?

If so then the passcode should be 1234 although technically they say that the passcode is

" 1234 "

It's been a while since I paired a bluetooth device but I think you only get 4 digits to work with, not 6, and I think only numerics are allowed so no spaces either, which brings us back to "1234"... which you've already tried.
Have a read over the website above and check out the Bluetooth User Manual page, the instructions don't exactly match connecting to a phone like you are trying to do, but maybe they'll give a clue to a step you might have missed or something.
Sorry I couldn't be of more help.

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I tried 1234 with the Phone but I repeat the process with a computer, maybe there is an issue with HTC. –  sorin Nov 16 '11 at 3:47

It seems that the correct code was already one of the listed ones, still there is a trick: it seems you are able to put the PIN code only one minute after the device was powered.

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The PIN code is 6789 instead 0000 or 1234

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