Master key imobliser problem, ok with spare "normal" key SOLVED

[ghost123uk]

Hi all,

About 1 week into ownership of the 2005 M59 (with "Modutop") and loving it. No downside and, after the VW Campervan, the performance / MPG on the 2.0HDi is a revelation.

However, today a slight problem. that could have been a "breakdown".

Yesterday, I carefully replaced the worn out plastics on the electronic key. No drama there = very straightforward in fact.
Went to the car, remote unlock & lock tested = all ok.
Tried to start the car, it turns over fine but no sign of it firing.
Almost on a whim, I went into the house and got the "non electronic" key.
It worked fine.
I then did a re-set of the "electronic" key, as per the manual, though I thought "this is a waste of time because the remote "lock & unlock" is working". And it was a waste of time.

The "non electronic" key's "shaft" looks exactly the same (well it would, wouldn't it).

I would be ever so grateful if anyone throw any light on this ?

[Trevor]

I would think that when you changed the plastic case you left the transponder in the old case?

[ghost123uk]

I would think that when you changed the plastic case you left the transponder in the old case?

Transponder?

Is that different to the PCB with the two buttons?

[Col]

Yep. It's a little chip in the corner

[ghost123uk]

Ah, good job I haven't emptied the waste bin yet then [Image: icon_redface.gif]

I'll report back.

Flip, this is all a learning curve compared to what I was previously used to [Image: icon_eek.gif]

[ghost123uk]

I'll report back.

Well, after digging through all the snotty tissues etc, I found the 2 halves of the old fob, and found the tiny "transponder" thingy. I carefully levered it out and put it in place in the new fob, and HEY PRESTO = It works.

Darn good job you guys chimed in before the bin men came !!!!!!!!!!!!!!!!!!!!!!!

Thank you very much to both Trevor and Col, I would have been stuffed without your help  [Image: ok.gif]

I've marked the first post as "Solved"

[Trevor]

Pleased to be able to help. It is only reading through the threads on here over time that I got that idea. Whatever problems you have you can bet that someone else has had the same one before.

[ghost123uk]

Pleased to be able to help. It is only reading through the threads on here over time that I got that idea. Whatever problems you have you can bet that someone else has had the same one before.

Over on the VW T25 forum I have been very active giving advice, as, over the years, have become a bit of an expert on them. However, on here I find myself being the newby, asking all the questions

[ron]

Pleased to be able to help. It is only reading through the threads on here over time that I got that idea. Whatever problems you have you can bet that someone else has had the same one before.

Over on the VW T25 forum I have been very active giving advice, as, over the years, have become a bit of an expert on them. However, on here I find myself being the newby, asking all the questions

Now it's time to get back what you've put into another forum.We love problem solving here & have some really hot techies.Let's just hope you don't need help too often.

[bigsacs]

This is a great answer that also helped me. having purchased a new casing i carefully swapped over the innards not realising the immobiliser chip wasn't part of the circuit board. Thankfully i'd kept the old bits and was able to retrieve the chip. Thanks again.  Just need to get round to sorting the central locking fault some day..........