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BMW 3-Series (E90 E92) Forum
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DIY Key Fob Programming Experiment
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07-15-2018, 07:15 AM | #45 | |
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Good luck on your adventure! |
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07-16-2018, 03:30 PM | #46 |
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The new batteries and Hitag came in. The hitag will not even connect to the software and the batteries do not fit in the keys.
Getting your money back from aliexpress is possible but is very difficult. Looks like a need to start claims for the batteries, R270 and the Hitag. My PCF7945 chips cleared customs and will be here tomorrow but now I can't even test if the keys work or not. |
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07-17-2018, 10:45 AM | #47 | |
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I'm still not sure what you are trying to accomplish with the transponder chips. I understand if you replace the transponder chip in a used fob, with a factory new transponder chip, then the fob will be programmable, but only by a software tool such as your MulitTool. You can't transfer data (clone) data from one transponder chip to another, and have it work. First, you need the crypto keys for the used transponder chip before you can read anything other than the ID. You can get the crypto keys for the used fobs from a dump of the CAS, and that will allow you to read the data stored in a used transponder chip, but you still have an issue with the ID. The ID of valid fobs for the car, are stored in the CAS. So, when you use a tool such as MultiTool to program a key, it not only programs the transponder chip, it changes data in the firmware of the CAS - it needs to update the area in the CAS that has the ID's of the allowed fobs. It is impossible to change the ID of a transponder chip. FYI, this is where the misconception that some people have about BMW putting aside 10 fobs for every car they make, the CAS comes programmed from the factory with the 10 transponder ID's, and BMW has record of what they are. So when you order a FOB from BMW, they create a FOB with that transponder ID. Also, I've never seen that error that you have with your Rosfar, my guess is that you have a bad solder connection.
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I keep getting robbed because I leave the front door open..
I could close it but I feel doing so would be a victory for the thieves.... |
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07-17-2018, 11:15 AM | #48 | |
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I will try the date hack for the hitag Update: The time change worked. I ran the blank fob through and only the SN comes up. Last edited by Nickco43; 07-17-2018 at 11:21 AM.. |
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07-17-2018, 01:19 PM | #49 | |
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If the transponder chip has not been programmed before, you should be able to read the chip values with the above settings.
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I keep getting robbed because I leave the front door open..
I could close it but I feel doing so would be a victory for the thieves.... |
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07-17-2018, 01:54 PM | #50 | |
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Update: All of the used keys have a battery voltage of 0.6V. They are all charging new and I will try again when I get home in a few hours. Last edited by Nickco43; 07-17-2018 at 03:09 PM.. |
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07-18-2018, 11:49 AM | #51 |
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The batteries did not charge and the fobs will not program. I highly doubt that it is my soldering job as the water damaged fob is now working.
I have soldered a few AA batteries to the fob and they are now charging. I have yet to find a good replacement battery for the non CA fobs. |
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07-18-2018, 12:23 PM | #53 |
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07-18-2018, 12:26 PM | #54 | ||
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There is no f*cking way I would pay $20 for one of these, but is this essentially what you've been using so far? Quote:
Very cool work too btw. Love it. |
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07-18-2018, 12:51 PM | #55 | |
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https://www.ebay.com/itm/Brand-New-P...53.m1438.l2649 I am not sure what is wrong with the blank chips but I do not really care anymore since I am just going to use the used boards as water damage repair donors. |
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07-30-2018, 02:10 PM | #56 |
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My CA key chips finally came in and once again they could not be programmed. It looks like there is no financially viable way to refurbish used key fobs for use with other cars. My aftermarket CA key comes in tomorrow and hopefully that will be able to be programmed.
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07-30-2018, 03:11 PM | #57 |
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please keep us posted. I've been dealing with trying to get my non comfort access key fob working again for the past few weeks. just had a new battery soldered in today and I'm still getting nothing from the key fob.
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07-30-2018, 03:14 PM | #58 | |
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07-30-2018, 04:16 PM | #59 | |
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07-30-2018, 05:20 PM | #60 |
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07-30-2018, 05:42 PM | #61 |
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07-30-2018, 07:32 PM | #62 | |
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my 20 minute ride home from work today didn't seem to do it, still nothing. thanks for the feedback oh gosh i was afraid of that... |
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07-30-2018, 09:18 PM | #63 |
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Not sure if this will help but I had a problem with one of my non CA FOBs too.
The remote didn't work (wouldn't unlock the door) but it would start the car. I opened it up (very carefully) and checked the battery. It had 3V on it so was good. I eventually found a guy that repairs BMW FOBs. He fixed it. Cost depends on whether or not you've already opened the key; ranges from $50 to 75. His website explains why. Not cheap but fair compared to a new FOB. www.bmwgm5.com |
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07-30-2018, 11:44 PM | #64 | |
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07-31-2018, 01:14 AM | #65 | |
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07-31-2018, 11:54 AM | #66 | |
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1.5 hour drive to work this morning and still no remote functions I need to test the battery and see what it’s reading |
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diy, keyfob, programming |
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