Author Topic: HV Battery indicator occasionally showing 10  (Read 3288 times)

PaulC

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HV Battery indicator occasionally showing 10
« on: September 09, 2022, 09:43:07 PM »
Earlier this year our Jazz was involved in a minor rear end collision. The damage has been fixed by a collision repairer (=panel beater). Since then, occasionally when I start the car the High Voltage battery meter in the driver information panel shows the charge as 10 out of 10

The car will drive along in non-EV mode while the meter continues to show 10, then after about 3 to 5 minutes  of driving the car will switch to EV mode and the meter drops down into the normal range of 3 to 7.

My diagnosis is that the car's software control system needs a reboot (like Windows computers) to bring it back into normal behaviour.

Has anyone else experienced this?

Kremmen

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Re: HV Battery indicator occasionally showing 10
« Reply #1 on: September 10, 2022, 06:18:53 AM »
Mine is the same. It will show 10 on powerup occasionally.

I can force it to show 10 if I give it a CTEK charge after a fortnights standing.

Other than that, my theory is that maybe you've powered down at a recharge high spot, 7 bars maybe, and the software needs a short while to recalibrate ?
Let's be careful out there !

Neil Ives

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Re: HV Battery indicator occasionally showing 10
« Reply #2 on: September 10, 2022, 08:00:09 AM »
I can force it to show 10 if I give it a CTEK charge after a fortnights standing.
Hold on a cotton pickin minute!
Your CTEK charge is for the small battery under the bonnet yeh? How can that affect the big boy under the back seat?
Neil Ives

Kremmen

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Re: HV Battery indicator occasionally showing 10
« Reply #3 on: September 10, 2022, 08:05:02 AM »
Exactly my point on a post I made ages ago, but, that's what happens.

CTEK the 12v battery till CTEK shows green, fully charged through all stages. Disconnect CTEK, powerup ....... 10 bars, every time, or every time I've remembered to look.

https://clubjazz.org/forum/index.php?topic=13973.msg110726#msg110726
« Last Edit: September 10, 2022, 08:08:28 AM by Kremmen »
Let's be careful out there !

Jazzik

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Re: HV Battery indicator occasionally showing 10
« Reply #4 on: September 10, 2022, 09:42:51 AM »
So you bought a Jazz plug-in!!!  8)
If nothing goes right, go left!

Kremmen

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Re: HV Battery indicator occasionally showing 10
« Reply #5 on: September 10, 2022, 11:43:33 AM »
I just like to ensure the 12v battery is regularly checked and charged. It's not uncommon for mine to stand for 2 or 3 weeks and when I do charge it it does take quite some time so must need it.

A previous test I did was to connect the CTEK a day after a long run and it took about an hour to complete. After 2 weeks it can take over 5 hours.
Let's be careful out there !

5thcivic

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Re: HV Battery indicator occasionally showing 10
« Reply #6 on: September 10, 2022, 05:57:27 PM »
I've just connected some flying leads to the 12V battery for trickle charging because I don't do many miles too, so will see if the 10 appears next time I charge up overnight.  ;)

John Ratsey

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Re: HV Battery indicator occasionally showing 10
« Reply #7 on: September 10, 2022, 08:57:17 PM »
CTEK the 12v battery till CTEK shows green, fully charged through all stages. Disconnect CTEK, powerup ....... 10 bars, every time, or every time I've remembered to look.
I'm impressed. :o :o The HV system is isolated when the vehicle is turned off some I'm wondering how the electrons not only jump across the gap in the isolator but also get boosted from 12V to 400V.

If the final part of a journey includes regeneration which leaves the battery at the top end of its normal operating range then the engine running at the start of the next trip to get itself and/or the vehicle interior warmed up will see the battery charge being increased. The cabin heating requirement in very cold weather means the engine keeps running to provide heat even when the battery is 7 bars or more. Turning off the cabin heating and using the heated seats enables the hybrid system to operate as designed.
2022 HR-V Elegance, previously 2020 Jazz Crosstar

Kremmen

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Re: HV Battery indicator occasionally showing 10
« Reply #8 on: September 11, 2022, 06:14:26 AM »
I fully agree, the battery meter must be reading something else other than just the HV battery charge.

I'm just posting it as it occurs on mine.

Could the battery meter be reading both batteries ?
Let's be careful out there !

Bristol_Crosstar

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Re: HV Battery indicator occasionally showing 10
« Reply #9 on: September 11, 2022, 09:26:20 AM »
Normally the 12V battery is charged by the high voltage battery when the car is switched on. If the 12V battery is fully charged this won't happen, maybe it confuses the software somehow so it gives an incorrect reading?

Lord Voltermore

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Re: HV Battery indicator occasionally showing 10
« Reply #10 on: September 11, 2022, 11:26:47 AM »
My understanding  is that most Hybrids have a problem if left unused for too long because the 12v batteries are normally relatively small and modern cars have quite a lot of computer activity running constantly.   A few hybrids can utilise  a few battery cells in their large HV battery.

  It  doesnt need enough amps to actually start the car, and you might think that it wont need much to actually fire up the computer systems.  But I  read somewhere that part of the start up procedure  involves the computer  running checks  before  approving the start up  (not much power needed)  but then it needs to 'throw'   quite a hefty solenoid switch to  connect the HV battery.( Some cars have two such switches, I believe the Jazz only has one.)   IIRC this switching requires about 30 amps.   This is no where near as much as  conventional car starter motor,  but it does  preclude  just having a tiny 12volt battery for the computer systems alone.

I have gone  quite a bit longer than 2 weeks unused without topping up the 12 volt battery,  without problem  , but maybe I am pushing my luck.   I can probably manage at home, and can charge it, but what happens if its left for an extended period in an airport car park etc.   

I am debating whether to buy one of  these 'power bank' portable starters,  that are small enough to keep in the car  (only about the size of a paper back book).   They claim to be able to start a conventional car so should  easily manage the 12v hybrid start up procedure.        But they do seem more expensive than they were a year ago.- even allowing for recent inflation.   One of those things that I may never use and resent the cost, but invaluable should you need it.  It would be great being independent  of the need to call a breakdown service, , or trying to cadge a jump start from another car  -  or being able to offer help to others without endangering your own car. 
 
  Trust a dog to guard your house  , but not your sandwich

Jazzik

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Re: HV Battery indicator occasionally showing 10
« Reply #11 on: September 11, 2022, 12:18:47 PM »
Once, a long time ago, I bought an "intelligent" battery charger. It was a good offer, for the money you couldn't pass it up. That thing is sitting unused in the garage collecting dust. That while we have been driving a hybrid (with such a weak 12 volt battery...) for many years, which have also stood unused in the garage for several weeks. Never had any starting problems.
I don't think I'll put a power bank next to that battery charger, not even to help that nice neighbour.
If nothing goes right, go left!

Kremmen

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Re: HV Battery indicator occasionally showing 10
« Reply #12 on: September 12, 2022, 04:28:51 PM »
Being as I haven't used mine since BH Monday 29th Aug I decided to photo the steps.

Power level was 3 bars, CTEK connected at 06:30. Still hadn't fully charged by 14:30 so give it a rest and turned CTEK off overnight. Reconnected this morning at 06:30 again and by 09:00 fully charged. Maybe sooner as I didn't check.

Powered up ....... cards on table, it only rose to 5 bars.

Oh well, failed this time.
Let's be careful out there !

PaulC

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Re: HV Battery indicator occasionally showing 10
« Reply #13 on: September 13, 2022, 10:59:04 PM »
We use our Jazz almost daily, for short trips of 8 to 25km.
I had the HV level meter show 10 yesterday.
Here's what happened. I backed out of the garage with the level meter showing around 7 and then the motor started to charge the HV battery.
I then drove off downhill and along a level road for about 3 minutes. During this time the motor charged the battery up to 10 but did not stop and continued running. The driver display showed "Ready" all this time.
I then came to drive up a long hill and as I started up the hill the motor stopped and the driver display showed "EV Ready" and the level meter dropped to 9 and continued down to the normal range of 7 to 3, at which point the motor started again to charge the HV battery.
After that the Jazz behaved normally as regards the HV level meter and the motor charging.
Very puzzling.

John Ratsey

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Re: HV Battery indicator occasionally showing 10
« Reply #14 on: September 14, 2022, 08:12:50 AM »
Did you have the cabin heating turned on? This will force the engine to keep running when the battery is well charged. Irrespective of the charge in the HV battery a cold engine will run on initial starting until it has reached operating temperature. Running the cabin heating adds to this run time while the car tries to get the cabin to operating temperature (enabling ECO mode reduces but does not eliminate this problem).
2022 HR-V Elegance, previously 2020 Jazz Crosstar

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