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Discussion Starter · #1 ·
Please could someone tell me how the immobiliser works? When I put the key in the ignition should the IMMO light up if all is ok?


I've been driving it for a few weeks and noticed that if the light doesn't come on, then it won't start so assumed that it had to be lit for it to start. I'm now thinking that there might be an error as it seems to be not coming on more often and I have to play around taking the key in and out until it lights up. I'm worried that it will eventually fail completely and I'll be stuck!
 

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There is an immobiliser antenna in the column at ignition switch which should pick up the chip in the key and turn off the immobiliser. Sometimes these go faulty or be intermittent. Try using the spare key and see if its ok. I had an immobiliser antenna go on my Rio and it was replaced under warranty.
 

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Discussion Starter · #3 ·
Thanks but should the IMMO light come on when starting the car or not? I'm still not clear! (Is it on when it goes wrong as a warning or is it on to show that it's all working ok?)
I'll check the spare key too.


It was much easier getting into my old Escort with a piece of packing strip!
 

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It comes on with ignition on before you start the car. Like Davy says, try other key, if it is still playing up it will be the immobiliser antenna coil. Its actually the ring around the barrel that has the writing on it which reads the info on the chip inside the key. Eventually it will probably fail altogether but luckily they are relativly cheap to replace,no more than£35 or so +Vat
 

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I,ve had this intermittent problem on my sedona for the last couple of years, it doesnt cause a problem for me, i just switch off the ignition wait a few secs then switch on again and all is ok, but it only happens say once every 2 or 3 months
 

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D971 said:
I,ve had this intermittent problem on my sedona for the last couple of years, it doesnt cause a problem for me, i just switch off the ignition wait a few secs then switch on again and all is ok, but it only happens say once every 2 or 3 months
Wouldn't be much good as a getaway car
 

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Hi. My IMMO light came on when driving and did not effect the drive of the car. I later found out the IMMO light should be off when driving. The key fob was faulty and the spare key did the trick. IMMO light off and drives the same tho.
Steve Gx Blackpool
 

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Discussion Starter · #9 ·
Thanks for all your advice.

I'm thinking that it may be interference from my mobile phone? It's been fine the last few days except once when I had my key in my pocket with my phone! My partner had the same problem with the spare key. The IMMO light wouldn't come on, it took several attempts before it would start. He said the key were with his phone. More testing over the next few days...................
 

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Hi. I know this is an old post but I'm having the same problem with my Sorento. I turn the key and the IMMO light doesn't come on. Turns over fine but won't start. Had the AA here for 2hrs trying everything but no go. He thinks it's the immobiliser. I found this post and read about replacing the immobiliser antenna coil and was wondering if this will need to then be coded to my keys? Thanks.
 

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Discussion Starter · #12 ·
Only just spotted your message, sorry. It was a while ago but I'm pretty sure I only needed to replace the antennae. The keys didn't need to be recoded. My local Kia garage sorted it for me. I'm out and about at the moment. When home I'll check the paperwork and see what it says.
 

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Discussion Starter · #13 ·
Just checked. it was only the 'immobiliser aerial' that needed to be replaced. Apparently they rust out and become temperamental. Supplied and fitted for £58.47 ex VAT.

If left, it can cause the immobiliser control box to pack-up. I was quoted £250 to supply and fit but luckily only needed the aerial.

I've had no problems with starting since.
 

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That's great thanks! I've now had to have it towed to my local Kia Dealer. My local garage said it was a complete mystery to them. They took the ignition switch out on my request and checked the immobiliser aerial for corrosion, made sure that the contact was good, but said it made no difference unfortunately. I'm hoping that Kia aren't going to hit me with a £250+vat bill but it may be looking likely! They said they'd charge me £45+vat for diagnostics and then let me know how much it will be to fix it.... I'll let you know what they find. <biting nails>

Edited by: stowbee
 

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all that is required is the pickup coil replaced, it is an easy diy job and no coding of the key is required, it is common on all kia models of the older variety, once the immo has got the key code to start then what it does after that will not affect the running of the car, the issue is that sooner or later it might pack up altogether and if it does you are stranded unless you know the override procedure and the password,
 

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It's now been at my Kia dealer for about a week and still no luck. They replaced a unit a bit higher up than the aerial coil which they said was corroded and probably causing the problem, but unfortunately, this didn't fix it. They're now saying that since replacing thatunit, a signal is now being sent to the immobiliser unit. the immobiliser unit is sending a signal to ECU but nothing happening from ECU. They think it's an issue with the immobiliser, the wiring, or the ECU and want more £ to investigate further. Not sure how much £ to throw at this? HELP!?
 

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they obviously do not know what they are doing, it is a "very" common complaint on all kia models of the older variety, if they start by replacing the pick-up coil because they are a known complaint, if they are kia dealers and were to phone kia technical they would be told to start with the pick up coil, they are not expensive, what ever they have already replaced tell them to put it back on the car and start with the pick up coil, then they can replace other parts if required,
 

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Because of what you had said about the coil, I double checked this with them and they say that it gets past that bit and all the way to the ECU before failing. They say they need to replace the ECU unit for about £950!!! Just what I was fearing them saying!
 

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I have to say again, for the cost of an antenna £35 ish or the cost of an ECU £950 ish I would definitely be starting with the pick up coil, always start with the cheap stuff, if they replace the ecu and it does not fix it, who is to know if they then replace the pick up coil and say nothing,"there you go sir it is fixed"they most "definitely" will not want an ECU in stock that cannot be sent back, parts can be got overnight, the coil might not be the fault but it is a "known" fault with kia cars, yes data is getting to the ecu they say but is it the correct data, is it being read correctly by the pick up coil. I had a technician who worked for me and his favourite was "sorry the ECU is faulty" ECUs VERY RARELY GO WRONG, it is usually the peripheral components that fail,
 

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Hi. I'm going to take your advice and ask them to fit the coil as a first port of call. Just waiting to get a quote from them to do it. As you say, best to cross off the cheap options first before spending £1k on it. I'm also looking into claiming from the dealer I bought it from. This happened 4 weeks after I bought it so I'm hoping I might have some comeback on it. Also paid by credit card which could work in my favour. Thanks again for all your help so far. Really appreciate it. I'll keep you posted on the antenna situation.
 
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