Author Topic: Central locking  (Read 10515 times)

Gary Clark

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Central locking
« on: July 05, 2025, 11:23:54 AM »
Hi all.

I'm new on here and hoping to find an answer or advice regarding a problem with my 2012 Jazz.

This week, the car was left locked and unused for 3 days. Over this period the battery went very flat. After a jump start, the central locking on the nearside doors and boot no longer lock on the remote or door button, but they will unlock on the remote or door button if they have been locked manually.

A new battery has been fitted to the car, and both remotes have new batteries. I've tried pretty much every trick on YouTube and Google to "reset' the locks and keys, but to no avail. The fuses must be ok as the dodgy doors are getting power in order to unlock.

Is it possible an actuator has a problem and was the cause of the flat battery, and also caused two other door locks to fail to lock, but still unlock? Seems unlikely, but who knows with modern electrics.

I'll probably end up at Honda next week, but was hoping to avoid them for obvious financial reasons, hence I'm here.

Has anyone any ideas please?

Gary.

Lord Voltermore

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Re: Central locking
« Reply #1 on: July 05, 2025, 04:39:36 PM »
hi  Welcome to the forum. 
Bit strange  ,I would normally have suggested reprogramming the keys  to the car  but you have already done that, and some functions seem to be working.

I notice a 2012 jazz has 6 fuse slots labelled as  door lock fuses,  positions 27,35,36,38 ,49,50  .  I am not sure how  a flat battery could have caused fuses to somehow blow.   But the quantity of fuses does suggest to me that   it may not be as simple as one fuse and power feed  serves for both locking and unlocking in each individual door. 
5 fuses may make sense - one to each door and one to the boot, but 6? 

But beyond that I cant help much.   There may be a central control unit  that divides the wiring , not individually to doors,  but for instance, one control unlocks both left doors, another locks both left doors, another feed  unlocks both right doors etc. In this way a single failure wouldnt completely  disable one door, but would half disable 2 doors . If that makes sense.  (a bit like lights are often fused separately for left side and right side, so if one side blows the other side should still be lit) 

I dont know if there is such an arrangement or where it might be located. Try  locating as many  wiring loom loom connector blocks as you can (especially those near the car battery ) and give them a good joggle  to see if there is a poor electrical connection,. The connectors may have been disturbed during the battery change, or indeed the source of any parasitic battery drain that flattened the battery.   
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bill ericay

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Re: Central locking
« Reply #2 on: July 05, 2025, 06:38:42 PM »
I hope keys were not in the ignition when you connected the jump start battery !

You haven't got much to lose apart from a big bill from Honda, so why not disconnect the new battery, leave it off for 30 mins then reconnect. ( Drivers window down and keys OUT of ignition while you disconnect and reconnect battery. This  quite often fixes a lot of weird electrical bugs on Hondas.

Gary Clark

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Re: Central locking
« Reply #3 on: July 05, 2025, 07:04:41 PM »
Thank-you both for your replies.

I did notice all those "potential"  door lock fuses. I had convinced myself that they would never have a circuit for locking and another for unlocking, but anything is possible of course. I will look into this further when I fancy getting on my back in the foot well to investigate those hard to see and hard to get at fuses!

The keys were in the ignition when the leads were connected. Is this a problem? Think that's how I've always jump started cars, vans trucks etc.

I will try the battery removal trick first as that's easier than checking fuses for my older body. No disrespect, but your description of the procedure made me think of a Mason's handshake ��

My niece has borrowed the car for a few days, but I'll let you know how the battery trick goes when I get it back.
« Last Edit: July 05, 2025, 10:41:40 PM by Gary Clark »

TnTkr

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Re: Central locking
« Reply #4 on: July 06, 2025, 06:28:29 AM »
I will try the battery removal trick first as that's easier than checking fuses for my older body. No disrespect, but your description of the procedure made me think of a Mason's handshake ��

The procedure is quite similar I had to use on my Peugeot for getting the central locking to work properly. But then I had written orders printed out from manufacturer's service bulletin. I'd like to see Honda's bulletin for this.

Kremmen

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Re: Central locking
« Reply #5 on: July 06, 2025, 07:58:32 AM »
If the doors unlock with the remote then you may be lucky, but with some Honda models leaving the key in the ignition was a surefire way of wiping the key

It was an issue on 2006 to 2009 Civics but I 'think' Honda did make some changes from 2009

Let's be careful out there !

Gary Clark

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Re: Central locking
« Reply #6 on: July 13, 2025, 12:01:39 AM »
I hope keys were not in the ignition when you connected the jump start battery !

You haven't got much to lose apart from a big bill from Honda, so why not disconnect the new battery, leave it off for 30 mins then reconnect. ( Drivers window down and keys OUT of ignition while you disconnect and reconnect battery. This  quite often fixes a lot of weird electrical bugs on Hondas.

Finally got my hands on the Jazz tonight. Opened the driver's window, disconnected the battery at both terminals, left for well over 30 mins, reconnected but unfortunately no change🙁

Passenger door lock sounds like it's wheezing, so maybe that's another clue?

Probably be taking it to Honda for diagnosis.

Thanks for your help everyone.

Gary Clark

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Re: Central locking
« Reply #7 on: August 19, 2025, 11:12:53 PM »
I always like to finish a thread where possible.

The car went into Honda today for investigation which cost £156. On top of that there was around 2 hours work, but they are only charging for 1 hour.

After following the diagnosis procedure and pulling the passenger drivers door apart, it was found that one of the many fuses that are on the central locking system had blown. Replacing this has cured the problem.

I'll try and find out tomorrow exactly where this fuse is situated.

So probably around £250 in total, but at least the job is done and my niece will be able to lock the car at night again🙂

Keekster71

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Re: Central locking
« Reply #8 on: August 20, 2025, 03:58:18 PM »
Thanks for the update, always helpful for future reference.  Frustratingly the parts will have been cheap, but knowing what the cause of the fault, is worth paying for.

As an aside, I did have a fault with the actuator on my japanese import.  I followed a you tube video and managed to repair it.  They are bad for burning out the actuator motors.
We live on a placid island of ignorance in the midst of black seas of infinity, and it was never meant that we should venture far." H P Lovecraft

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