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As promised, here's a photo of the battery with two connectors to the right of the negative terminal. The nearer grey lever can be lifted to disconnect the battery from the black box underneath. My guess is that the black box contains the car microprocessor. I have some experience of microprocessors, albeit in a different context, and I know that sometimes they have to be reset by turning off the power completely (not just via a hardware reset signal.) So this may well be what did the trick for me.

Thanks, I see what you mean now. I'm a bit nervous about fiddling with clips like that where I'm not sure how to release them, in case I break them. So I just unbolt the negative terminal from the battery post for 5 or 10 minutes, which ought to have the same effect. But so far neither that nor the release-bonnet-whilst-engine-running thing has restored the auto idle-stop. Maybe it'll come back from it's winter holiday in it's own good time, maybe not.
Off Topic (Non-Honda) / Re: Electric cars
« Last post by Jocko on Today at 01:05:15 PM »
Companies are opening up in the UK to repair EV battery packs. They are just composed of cells linked together, the same as lead acid batteries, and defective and damaged cells can be replaced. There is no super science involved. It requires the skills of a competent electrician.
Honda Jazz Mk4 2020 - / Re: 15" or 16"?
« Last post by Lord Voltermore on Today at 12:22:29 PM »

Thats as maybe, but were the Jazz is concerned and the difference between the Honda wheel options available... does it really make that much difference in driveability regarding bumps in the road?  ;)
I dont think so. Having a different brand of tyre can make just  as much difference IMO
New Members / Re: New Member
« Last post by Derkie54 on Today at 11:31:22 AM »
Hello and welcome  :)
Honda Jazz Mk4 2020 - / Re: 15" or 16"?
« Last post by Nicksey on Today at 11:30:09 AM »
1/2 " difference in side wall height is an  approximation.  Higher tyre walls make up the 1" difference in diameter between  15" and 16" wheels , ie  1/2" more  height between the wheel and the road, and 1/2"  more at the top of the wheel where it makes no difference to handling etc.

To be more accurate  the profile of the tyre as shown in  tyre size  , eg 185/60/R15,  is a percentage of the tread width.   . Thus 60% of 185 mm is 111m  side wall    while its 16" equivalent  185/55/R16   is 55% of the same 185mm tread width  ie only   101.75 mm   .  10mm less (approx) ,  which is 0.4 " , not quite half an inch.   Not only that but measurement will be of a curved rubber side wall, not just the extra height between wheel rim and road surface.   

Things get more complicated if tread width changes.  For instance  a 195/60/R15 tyre side wall is 60% of 195  =  117 mm not 111mm

Thats as maybe, but were the Jazz is concerned and the difference between the Honda wheel options available... does it really make that much difference in driveability regarding bumps in the road?  ;)
After calling several independent garages (near Dartford, Bexley etc.), booked a Honda dealer for CVT fluid change. Will update after it is done.
early 1950 theree used to be siren alerts throughout the UK, these were to 'practise' for nuclear attacks. Schools and public information films gave guidence about hiding under tables, away from windows etc.
I have found this re-mastered film Also old nuclear bunkers open to the public run these.

Maybe this new signal is a fore-taste of what is coming??
Off Topic (Non-Honda) / Re: Electric cars
« Last post by Kremmen on Today at 11:09:08 AM »
For many electric vehicles, there is no way to repair or assess even slightly damaged battery packs after accidents, forcing insurance companies to write off cars with few miles - leading to higher premiums and undercutting gains from going electric.

And now those battery packs are piling up in scrapyards in some countries, a previously unreported and expensive gap in what was supposed to be a "circular economy."

"We're buying electric cars for sustainability reasons," said Matthew Avery, research director at automotive risk intelligence company Thatcham Research. "But an EV isn't very sustainable if you've got to throw the battery away after a minor collision."

Battery packs can cost tens of thousands of dollars and represent up to 50% of an EV's price tag, often making it uneconomical to replace them.

While some automakers like Ford Motor Co (F.N) and General Motors Co (GM.N) said they have made battery packs easier to repair, Tesla Inc (TSLA.O) has taken the opposite tack with its Texas-built Model Y, whose new structural battery pack has been described by experts as having "zero repairability."

Tesla did not respond to a request for comment.

Unless Tesla and other carmakers produce more easily repairable battery packs and provide third-party access to battery cell data, already-high insurance premiums will keep rising as EV sales grow and more low-mileage cars get scrapped after collisions, insurers and industry experts said.

"The number of cases is going to increase, so the handling of batteries is a crucial point," said Christoph Lauterwasser, managing director of the Allianz Center for Technology, a research institute owned by Allianz (ALVG.DE).

Lauterwasser noted EV battery production emits far more CO2 than fossil-fuel models, meaning EVs must be driven for thousands of miles before they offset those extra emissions.

"If you throw away the vehicle at an early stage, you've lost pretty much all advantage in terms of CO2 emissions," he said.

There are a growing number of repair shops specializing in repairing EVs and replacing batteries. In Phoenix, Arizona, Gruber Motor Co has mostly focused on replacing batteries in older Tesla models.

But insurers cannot access Tesla's battery data, so they have taken a cautious approach, owner Peter Gruber said.

"An insurance company is not going to take that risk because they're facing a lawsuit later on if something happens with that vehicle and they did not total it," he said.
In 2017 it was approx. 120k, now 170k, so roughly 50k.
New Members / Re: New Member
« Last post by Jocko on Today at 10:57:22 AM »
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