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Discussion Starter #1
Hello all,

After some help or suggestions please :(

I'm on my 3rd battery in about 6 weeks. The first two were Bosch S4 021 45Ah 330CCA ones. The latest one is a Yuasa HSB053 48Ah 430CCA.

The problem is that they keep going flat. My car wouldn't start this morning after leaving from Friday afternoon. It started fine Friday afternoon coming home from work whereas with the Bosch ones it would slowly begin to labour when starting.

I've had the alternator checked on the first Bosch battery I had and I saw it charging at 14v when the mechanic showed me. I'm really at a loss with what to do and can't keep having this unreliability with my car :(

The only thing I've done to my car, I guess, was change the Sat Nav CD to another one. Is it possible that the Sat Nav screen is turning off but is continuing to drain the battery?

Thanks for any help
 

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Discussion Starter #3
Thanks very much Farqui, I'm just charging the battery in my house at the moment. In the morning, I'll reinstall the battery and try to disconnect that HFT unit just in case. It sounds as though that's likely to be the problem. Will it disable my Satnav? I've never even used the hands free in my car since I bought it nearly 2 years ago hah.

Once I can go buy a multimeter to test for power draw, I'll then reconnect and try diagnose the issue for good. Really can't afford to pay Honda ludicrous amounts to faff about my car for hours, got a baby due in a couple weeks!
 

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Dubbz the sat nav will still work. Only the phone and any voice commands you may or may not use will stop. Had exactly the same on mine, HFT now disconnected.
 

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Thanks very much Farqui, I'm just charging the battery in my house at the moment. In the morning, I'll reinstall the battery and try to disconnect that HFT unit just in case. It sounds as though that's likely to be the problem. Will it disable my Satnav? I've never even used the hands free in my car since I bought it nearly 2 years ago hah.

Once I can go buy a multimeter to test for power draw, I'll then reconnect and try diagnose the issue for good. Really can't afford to pay Honda ludicrous amounts to faff about my car for hours, got a baby due in a couple weeks!
If you don't use HFT then unplugging it is a great option. Actually, even if you do use HFT then disconnecting it is still a good option to test if it is the cause of your battery drain.

As has already been mentioned - disconnecting HFT will not disable your satnav.

Let us know how you get on.
 

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Discussion Starter #6
Just been out with torch and disconnected the HFT unit. Will report back tomorrow, hopefully after testing with a multimeter.

Thanks for help both :)
 

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Discussion Starter #9
Will do markvirgo, thanks. Where abouts would I locate this though?

Batteries not flat yet anyway. I've had a multi-meter on it tonight but it was dark. It was reading between 2.5 and 3.0amps with the car locked. I then removed each fuse one at a time and it didn't drop but I didn't clamp the door switch down.

However, despite that, my wifes dad thought he may have not set the thing properly so we went out again and it was around 0.2amps with the car locked. I do believe this is still excessive though, at least based on YouTube videos I've seen.

I'm going to hang in till weekend and then test is all again in the light. Unless anyone has any further thoughts? Thanks.
 

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The aircon relay is in the engine bay fuse box.

I hope you got the multimeter scale wrong, your 2nd set of results look better. After ignition off the battery drain will be quite high for a while (15 sec's? I can't recall exactly atm) then it should drop right down. You also need to fool the car into thinking all doors/bonnet are closed to properly test for a drain.
 

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Discussion Starter #11
Thanks Farqui. How do you trick the car into thinking the bonnet is shut I can't see any obvious switches like in the door surround?

Checked again last night. Read 0.068 on the reader. I'm not good at electrics, is 50 milliamps 0.050? A YouTube video I saw said anything above that is excessive.
 

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Discussion Starter #12
Going to plug in the hft module at weekend and test again. See if it changes anything in terms of amp drain.
 

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Thanks Farqui. How do you trick the car into thinking the bonnet is shut I can't see any obvious switches like in the door surround?

Checked again last night. Read 0.068 on the reader. I'm not good at electrics, is 50 milliamps 0.050? A YouTube video I saw said anything above that is excessive.
See Handy Tip at the bottom of Flat battery - Civinfo Wiki

The scale of the mutli-meter will determine what output you are seeing.

Does the drain vary or drop after a few minutes of locking?
 

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Discussion Starter #14
It drops after locking the car. I'm not sure whether the meter is accurate though as it reads like 0.01/2 when not even attached to anything. It keeps going up and down. However, it does change when I open/lock the car and the wing mirrors open/fold automatically.

I've pulled out the aircon relay (OMRON) and it rattles inside. Going to get it swapped to another one.
 

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Sorry I'm late to the party.
When I check my drain I start in the 20amp range (old multi meter doesn't auto range).
When my HFT is plugged in I was getting 0.500A (half an amp). this is excessive.
When HFT removed, after the interior lights go off the drain goes down to 0.002 (to small for the range really)
That is the sort of figure you should be seeing when set to 20A range on your multi meter.

If it is the HFT causing drain then I have a simple fix using a relay.
 

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Discussion Starter #16
Thanks for the help. I'm not sure if one of my multi meters is working okay. No matter what it won't show anything I've even tested on a working battery. I did try check the volts the other day and thought I'd set it correctly but it got really hot so I took it off. Maybe blew a fuse?

I've got a separate multi meter that doesn't have cables just prongs and that's the one that shows 0.02/1 but can't figure out how to get the reading any smaller. The options don't go down from like 200 to 20 to 2 for example. Her dad just set it on 400? But the only other option on direct amps was 600? I'm a noon probably end up doing more damage if I start changing stuff
 

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Discussion Starter #17
Forgot to add to this post but better late than never as may help someone else in the future diagnosing a problem like this.

It was in fact the Aircon Relay (OMRON). I replaced this with a better version Honda now supply and the issue has not returned, car's been running fine ever since :)

Thanks for help all, was much appreciated.
 

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Have had an issue with mine on a few occasions battery totally flat,it's been into Honda who can't find anything wrong at all.
Went out to it just this week and nothing,charged battery and started it up left running for 20 minutes,next day nothing again.
Still have Honda warranty with AA assist call them out,tests battery has 5 volts,boost starts car and within 20 mins his readout shows good battery does all tests for parasitic drain,shutdown amps etc all show normal levels.
This is the fourth time they have been out started and tested it all showing normal levels when locked,never leave lights or wipers in auto mode and nothing is plugged into lighter port.
One of the AA guys said he had one and it was caused by water entering around the wiper arm ports and causing a short.Anyone else had this ?.
 

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Never heard that, but one this to note is a discharged battery nearly never returns to full working capacity.
5v from a 12v battery is deeply discharged so consider changing the battery.
 

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Never heard that, but one this to note is a discharged battery nearly never returns to full working capacity.
5v from a 12v battery is deeply discharged so consider changing the battery.
The AA guy run the test on it after running the car for 20 mins,and said battery was perfect and did not require changing.
He also run the test with all lights,wipers,radio,air con etc running and it held up fine.
It's strange it seems to happen every few months and will then be fine for ages,started fine today and also fine after being stood for two days whilst I was away.
A mystery fault.
 
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