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Discussion Starter #1
Hi, my wife's 2006 Civic has a power drain that is flattening the battery if left un driven for more than 24 hours. I have tested using a multi-meter and found there is a power drain that cycles between 0.2a and 0.5a when everything is switched off (doors closed, lights off etc etc). This disappears when i pull out the fuse in the picture (number 16 in fuse box under the bonnet). I understand this covers central locking, stereo, sat nav etc Any advice as to where to start looking for the fault? the fact that the drain cycles between 0.2A and 0.5A every few seconds maybe relevant? any advice greatly received.

 

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What is the car, year and spec?
Battery drain can be hard to find - fuse 16 is the back up power (ie always live) for B-CAN devices; MICU, Gauge control module, immobilizer and the HFT.

I'm going to assume for a moment that you have bluetooth/HFT in your car, and that pulling fuse 16 is killing the always live to it.
For a simple test, please put fuse 16 back in.
Open drivers door, with a flat blunt object pry of the triangle cover
Undo 1 cross head screw
Now pull the lower dash down, and the little black box screwed on the lower dash panel with a green plug is your HFT.
Release the plug (easier to unscrew the unit first), then close up your car and check drain.
 
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Discussion Starter #4
cheers guys, and thanks for the welcome.

model is a 2006 Ex i-VTEC 1.8

it does have the BT/HFT and my wife never uses it.

Come to think about it I tried to set it up for my phone once and gave up as I couldn't get it to setup on my voice prompts. I will try pulling that later and see if it fixes it, we can live without that if its failed.
 

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The HFT module becoming faulty and then drawing current continuously is a very common Honda problem. I have seen a thread (on another forum) where this was repaired by 're-flowing' the solder joints in a domestic oven.
 

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Had this on an Astra and it was the Alternator shorting out. Didn't happen all the time but when it did it drained the battery quickly.
 

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The HFT module becoming faulty and then drawing current continuously is a very common Honda problem. I have seen a thread (on another forum) where this was repaired by 're-flowing' the solder joints in a domestic oven.
Yeah, that was a method that I had mentioned in GTV1's post about attempts of repair. Funnily enough Jon, I spied this on an American Accord site I think!

BikerBudgie - Give it a go at removing the uni as per my instructions, its really a 5 minute job. Give the multimeter a whizz again and see what you get.
It is highly likely to be the HFT (as it was in my case) BUT the B-CAN also controls the locking system, so a faulty door switch could easily keep the B-CAN active when it should be sleeping.
 
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+1 If you don't use the HFT then unplug and see if the drain persists.
 

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Discussion Starter #10
What is the car, year and spec?
Battery drain can be hard to find - fuse 16 is the back up power (ie always live) for B-CAN devices; MICU, Gauge control module, immobilizer and the HFT.

I'm going to assume for a moment that you have bluetooth/HFT in your car, and that pulling fuse 16 is killing the always live to it.
For a simple test, please put fuse 16 back in.
Open drivers door, with a flat blunt object pry of the triangle cover
Undo 1 cross head screw
Now pull the lower dash down, and the little black box screwed on the lower dash panel with a green plug is your HFT.
Release the plug (easier to unscrew the unit first), then close up your car and check drain.
Thank you! Removed the HFT and drain now appears to be gone

Now to see if its worth replacing
 
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