Alarm Fried Immobiliser? - Civinfo
 
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post #1 of 14 (permalink) Old 1st April 2011, 12:46 Thread Starter
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Question Fried Immobiliser?

So, I guess it has finally happened that the car has ripened into a lemon.

As it stands at the moment my car is only getting used perhaps once or twice a month due to various reasons. it is always used for long journeys however so I didn't think keeping the battery charged would be an issue.

Yesterday though, I went out to do my routine potterings and the car wouldn't start, i measured the voltage across the battery and it was 4.4V. Dead battery... it was a Unipart thing though so I have no idea how old it was. I have replaced it today with a Varta E44 battery, however as soon as I connect the earth to the battery the alarm starts blaring out. no combination of keypresses or anything will shut it off, it seems to go on for about 20 seconds then turn off for about 10 seconds, and repeat itself indefinitely.

The engine also won't start, it cranks however doesn't seem to be getting any fuel - the isolator switch is pressed how it should be, but what worries me is that the green key symbol on the dash remains flashing. It's doing this with both my keys (neither of which were within 10 yards of the car when the battery was swapped) which suggests something has gone wrong with the immobiliser.

Is there anything further I can do to diagnose this fault or is this going to be a tow truck to Honda job?

It's a 2006/56 diseasel, according to Honda there are no outstanding recalls on it.
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post #2 of 14 (permalink) Old 1st April 2011, 13:12
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Is the new battery fully charged ???
You can try priming the fuel system as well with the priming bulb...just keeping squeezing til it goes hard

You should also check if you have had the MICU recall and in the meantime make sure nothing is set to auto.




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post #3 of 14 (permalink) Old 1st April 2011, 13:42 Thread Starter
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I don't think the MICU recall applies for my car unfortunately - there is nothing in my service book to say it has been done and the website says no outstanding recalls. I will try the fuel priming bulb but not holding out much hope...
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post #4 of 14 (permalink) Old 1st April 2011, 13:51
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I don't think the MICU recall applies for my car unfortunately - there is nothing in my service book to say it has been done and the website says no outstanding recalls. I will try the fuel priming bulb but not holding out much hope...
Well flat battery within a few days is either the MICU, knackered battery, or current drain somewhere.
Hvae you fitted any aftermarket electrical items ???



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post #5 of 14 (permalink) Old 1st April 2011, 14:03 Thread Starter
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No dice on the fuel primer no aftermarket accessories attached either. The new battery is fully charged and is supplying more than enough power to crank the engine.

This seems to suggest that this MICU is at fault, are there any other checks I can do to confirm/deny?
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post #6 of 14 (permalink) Old 1st April 2011, 14:24
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Not really matey.... dealer job.
....just check all the fuses.
Most cases like these are bad battery or fuel cut off.... but you done those.



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post #7 of 14 (permalink) Old 1st April 2011, 15:09 Thread Starter
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Understandable but a royal pain in the backside . It would be nice if a car with such "advanced" electronics as compared to some other ones actually gave you some kind of indication what the issue was rather than just a green light blinking on and off and a nuisance of a siren...
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post #8 of 14 (permalink) Old 1st April 2011, 16:13
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Quote:
Originally Posted by davestones View Post
Understandable but a royal pain in the backside . It would be nice if a car with such "advanced" electronics as compared to some other ones actually gave you some kind of indication what the issue was rather than just a green light blinking on and off and a nuisance of a siren...
And when a Honda diagnostic tool is plugged into the car, IT will diagnose what the fault is. The car is letting you know there is a fault somewhere along the line with the ignition/immobiliser system, It will tell the diagnostic tool WHAT the problem is.

How long has the car been flat for? If a new battery connected is having no effect, something is stopping the circuit and i'd suggest either the main fuse (there to stop damage if the battery is cross circuited) or the ignition system. It may have 'lost' the code for the key. Re the alarm, sometimes, if the battery has drained sufficiently, the alarm sounder power supply will begin to drain, connecting a new main battery wont cure it instantly and it may need a new power sounder unit.
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post #9 of 14 (permalink) Old 1st April 2011, 16:19 Thread Starter
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To my knowledge the car has only been flat a maximum or 4-5 days. I am of the opinion from everything I have read here that the key code has been lost for both my keys.

C'est la vie, it's just one more thing that has tainted this car for me, my old Mondeo could be left for months at a time and still restarted it when I need to. I guess that's the price to pay for having a car full of complicated electronics nowadays.

I notice that you work for Honda, as a rough guide what kind of labour rates are involved for reprogramming the keys and diagnosing anything else (making the assumption that this is where the issue lies).
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post #10 of 14 (permalink) Old 1st April 2011, 16:42
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Approx 100 per hr + vat, depends where you are in the country.

Different dealers have different rates but expect about 1/2 hrs labour...
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post #11 of 14 (permalink) Old 1st April 2011, 21:30
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One thing you could try first before running to the dealers,this is a long shot but peugeots are prone to this also when the battery is flat. First disconnect the battery,then make sure the doors are unlocked,put the key in the ignition and switch it to the on position,then close the door and make sure you have the spare key to hand,next re-connect the battery this may make the indicators flash a few times or activate the central locking it may not hence the need for the spare key,then open the door and try the start button, this "sometimes" resets the system in some cases.
Give it a try and see what happens you never know.
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post #12 of 14 (permalink) Old 1st April 2011, 23:01
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One thing you could try first before running to the dealers,this is a long shot but peugeots are prone to this also when the battery is flat. First disconnect the battery,then make sure the doors are unlocked,put the key in the ignition and switch it to the on position,then close the door and make sure you have the spare key to hand,next re-connect the battery this may make the indicators flash a few times or activate the central locking it may not hence the need for the spare key,then open the door and try the start button, this "sometimes" resets the system in some cases.
Give it a try and see what happens you never know.
No... scrap that!

Fidset, I guess your not too familiar with the 2.2 but connecting/disconecting the battery or jump leads (while the key is in the ignition) is one method for frying the ECU or wiping the keys

You have been warned as they say.



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post #13 of 14 (permalink) Old 1st April 2011, 23:30
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Right kept that in mind.
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post #14 of 14 (permalink) Old 1st April 2011, 23:59
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Right kept that in mind.
The Honda electrics.... are a tad fragile
Think we have had 5-7 ECUs replaced on this forum so far
1000+ each
Think they were al diesels funny enough
Wiper motor overload is another cause.



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