05 Nissan Micra Immobiliser fault.

Hello, I have no idea about almost anything when it comes to cars so any help would be appreciated! My 05 Nissan Micra suddenly cut out on me yesterday about 10 seconds into my journey. It doesn’t even attempt to turn on - the only light flashing on the dash is the immobiliser. I have tried to jump start it, changed the battery, changed the battery on the key fob and checked the fuses. I had a mechanic out who suspects that it is immobilised (guessing the key ran out of battery - as I had never changed the battery - mid drive) as the lights will come on and the diagnostic showed nothing wrong but it won’t lock/unlock, turn on etc. Does anyone have any idea how to bypass the immobiliser? I have tried the method of turning the key to the on/off 6 times and then holding the lock button down etc but no luck!
Any suggestions will be greatly appreciated! Many thanks
 

huttojb

Club Member
EPS System Guru
If the eps was changed not correctly and you suffered a flat battery or a battery disconnect then yes. This will show a key turn with nothing happening and a NATs light. But I’m sure there could be other root causes, this is the one I know and fixed many times for people on here.
 
If the eps was changed not correctly and you suffered a flat battery or a battery disconnect then yes. This will show a key turn with nothing happening and a NATs light. But I’m sure there could be other root causes, this is the one I know and fixed many times for people on here.
I had this happen recently after changing the battery and it had trouble starting (eps was replaced last year). Also about 5 min into my drive the red car symbol illuminates and stays on for the duration of my journey. How do I solve this?

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huttojb

Club Member
EPS System Guru
This is due to the security on the EPS. when they changed the eps they never remove the battery which will result in this failure mode. If you get a flat battery or remove it, you can will not start! Please be careful, I’ve seen this many times.
 
This is due to the security on the EPS. when they changed the eps they never remove the battery which will result in this failure mode. If you get a flat battery or remove it, you can will not start! Please be careful, I’ve seen this many times.
Unfortunately I am in N. Ireland. Is there anything I can do to rectify this, don't wanna get caught out again when battery dies. Last time I locked and unlocked the doors using the fob, then entered using the key itself, turned the ignition to the on position for 5 mins, back to off then it started. Don't want to risk it again.

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huttojb

Club Member
EPS System Guru
Dongle is a software security, so the eps pairs with the car and then records the ‘dongle’ in NVM. The dongle is a code that pairs both sides, eps to BCM this cannot be cleared or changed by a third party.
On ignition on the BCM checks the dongle in the ECUs and ensures it matches. If it does not match you get a NATs issue.
I know people mess around with the NVM but I would not recommend as this will cause possible issues with other variables in the NVM, like tune data (see my other post on this)

Jason

hope this helps.
 
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