Possible immobilier issue

Thanks Robbie and coconinio! The remote locking system does not work. The ignition lights come on and the hazard lights. The wipers also initiate for some reason and don’t stop. Heater does not come on. The battery is under the bonnet and I did not jump it with the wrong terminals previously or when I tried this time. Yes it is stored outside.

Yes it is a MK3. 56 plate

It had started fine many times previously and very recently through all that winter rain we had.

I’m thinking this too, check for corroded terminals in connector blocks in the area of behind the glove box and passenger footwell.

OK, I’ll have a look for that. Fuses there were all checked and were fine though.

Did you clean the terminals on the new battery and inside the battery clamps? The battery earth lead has a connection below the battery which is just about visible. It can be seen between the battery box and power steering reservoir. Does it look clean and tight.

Whilst talking earths, there are earth points on both inner wings back towards the bulkhead. The n/s inner wing earth point earths some of the relays in the under bonnet fuse box. Check both the earth points and look for any signs of the wires having heated up or melted. I have read a couple of reports from American owners of an ignition relay problem which shorts and burns out the earth wire (mostly hidden in the loom wrapping).


Thanks Richard - I’ll take a look now this afternoon.

Are you absolutely sure the ST fuse number 14 is ok in engine compartment fuse box.?

Yep. Fuse 14 is fine. Hmmm.

Apart from the starting problems, did you have any of the other issues before changing the battery?

I have read several posts online regarding starter solenoid failure on the nc after repeated jump starts and flat batteries. You probably need to try a temporary seperate power cable direct to the starter connections to see if it is a starter or a wiring issue. Also rig a temporary ground cable from battery neg to engine casing to rule out a ground fault

Nothing Phil. The car is in an excellent condition and has started first time since I bought it. Imacculate.

I’ll look into that. Thanks for being so helpful.

Nothing Phil. The car is in an excellent condition and has started first time since I bought it. Imacculate.

Just thinking it might be connected (no pun intended) to the battery change, possibly disturbed something, like an earth connection.

Hoping it turns out to be an easy fix for you!

Ha! Thanks Phil. I believe it must be related to the fact that I opened the door with the key because there was not enough battery charge to use the remote fob, and that it’r buggered up some circuit or other. I’ll get there!!

Hi Alun

I know the battery is new but it’s my understanding it’s never actually started the engine. If you have a volt meter, check what voltage of the new battery. Try the jump leads again from a donner battery but connect the neg lead straight to your engine.
Did you try mk375’s suggestion of an earth lead straight from the battery neg to your engine (use a jump lead)?
When you turn the key to the starter position, do the ignition lights flicker or dim, do any of the gauges flick up?

I don’t think the problem is anything to do with you unlocking the car with a key, as RR has already stated “ The remote locking system has nothing to do with the immobiliser system so you can rule that out as a cause.”


As you are having a problem with the remote key and to rule out that area of worry you could put a fresh remote battery in and reprogramme the key to try and operate remote locking using the instructions in one of the online tutorials. Google Mazda NC remote key programming for some info.

Sorry, but, as pointed out, the remote unlocking is completely separate from the immobiliser system.

I read that but It is coincidental and not desirable/unexplained as to why its not working. If it is returned to working condition then you have one problem remaining and not two.