random coded key (aftermarket) starting issue

[grey535i]

Ok, so I have an issue with a key I coded with AK90 to my 05 3.0d (Australian delivered, not sure if this make a difference).

So i bought the car & only had one key, that i believe to be an original key, so I had one cut & then i coeded to car with AK90.

So the original Key is the type with the charging coil on the PCB & the new key I coded has the indipendant "chip that you glue into the key fob.

So the Key is synced to the central locking & all thise functions work as should, i know this is seperate function to starting.

The issue I am having is it does not start the car consistantly.

So fisrt of all the original key starts the car flawlessly, never an issue, I dont have to turn it a special way or hold in a position for a few seconds to start, it just works as it should. except that the central locking functions are toast due to damage of the surface mount buttons on the PCB, I know these are unrelated to starting.

The key I coded with AK90, the small chip type, it is not consistant with the way it starts the car. So sometimes it will start the car no problem, sometimes you will need to hold in the start position for a few seconds & then will start, sometimes it will just not start the car at all, but then if you start the car with the original key the "new" key will then start the car continuously without any trouble for the next few times atleast.

So i wouldnt have thought it would be iginition switch mech as it works with original key all the time. So maybe it is the strength of the sensor / induction ring on the ignition switch, or maybe the small chip type transponder is not properly compatible with the EWS module version in the car. I cant remember the EWS version in the car & not close to the car to be able get a pic.

I had another aftermarket / ebay coil type / pcb type transponder that i tried to read with ak90 & try code but ak90 read it as "unknown ket type".

hoping someone can assist.

[TC2]

Hey grey535i,

I've been cutting and programming my own keys for years without problems so I might be able to assist.

Could you post a picture of the circuit board and transponder of the aftermarket key for me to look at?

My first thought is that the transponder you used might not be a genuine PCF7935. The replica transponders don't really work from my experience.

Those transponders will work with the EWS systems in E53s. They just won't store the mileage when the car is turned off like the 10030A transponders in the diamond keys.

The valet keys still use the PCF7935.

If you want a for sure working key I would purchase a used diamond key and remove the circuit board. Desolder the old 10030A chip and solder a new one in and program it to your EWS module with the AK90. Then place the circuit board in your new cut aftermarket key.

[grey535i]

Originally Posted by TC2

Hey grey535i,

I've been cutting and programming my own keys for years without problems so I might be able to assist.

Could you post a picture of the circuit board and transponder of the aftermarket key for me to look at?

My first thought is that the transponder you used might not be a genuine PCF7935. The replica transponders don't really work from my experience.

Those transponders will work with the EWS systems in E53s. They just won't store the mileage when the car is turned off like the 10030A transponders in the diamond keys.

The valet keys still use the PCF7935.

If you want a for sure working key I would purchase a used diamond key and remove the circuit board. Desolder the old 10030A chip and solder a new one in and program it to your EWS module with the AK90. Then place the circuit board in your new cut aftermarket key.

Hi TC2, sorry for the lat reply but have been away at work & could not get a pic of the key in question. Would appreciate whatever advice you can impart here to help.

The key I "coded" & am having problems with is the type that has seperate chip that you glue into the key body, pic below of my actual key. Is this type of key usually compatible with the EWS found in 05 e53?

The other pic below of the PCB with integrated chip is the type of key that i am getting unknown key type error with my ak90, I cant remember if that is what comes up with a new blank "key" before coding, has been a while since i did the other key.

I suppose if not normal message this could just be a faulty unit maybe.

[Homerlovesbeer]

Following with interest, I hope U fix this.

[grey535i]

so in the interest of closure, I found what was the issue here... well 2 issues.

so issue 1 was the key intermitantly working, so as someone mentioned to me elsewhere there was a bad batch of chips getting about & would appear that mine may have been either of this batch or faulty in its own right. So I had this Key scanned by another member today with a different piece of kit & it was not consistantly scanning. So appears faulty chip.

Issue 2 the "coil on PCB" type keys i had showing as "unkown Key type error" with AK90, so again had these scanned & they are ID46 type, but upon showing him the add for the keys I bought he saw that they were for CAS2, which the AK90 is not able to program or read so this explains the error i was getting.

so he sold me a replacement chip which worked as expected in the AK90 & the key is now working as it should.
case closed ��