2007 L322 power drain resolved

Rallymantony · Aug 21, 2023

Hello peoples

Not been on here for a while, it seems to have been up, work, bed, repeat for the last few months........ Anywho, I've had a serious power drain on my 322 for the last 6 or so months where the battery would go from fully charged to 7.6v within a few hours! Checked every fuse, researched all the usual suspects, replaced various non expensive bits............ Turns out it was the Harman Kardon amp in the boot! Now I said earlier that I checked every fuse, well the amp fuse was pulling 100 milliamps so originally I just pulled the fuse, when it made no difference I assumed that this wasn't the problem... I fully confess that I am worse then unless when it comes to auto electrics which is why its probably taken me so long to find the problem. So pulled the amp out and now all seems to be behaving itself.. Thought it was worth posting in case it helps someone else.. Now I just need to find a new amp or someone reliable to repair this one.. anyone?

kermit_rr · Aug 21, 2023

how do you know it was the amp if pulling the fuse made no difference?

Rallymantony · Aug 21, 2023

kermit_rr said:
how do you know it was the amp if pulling the fuse made no difference?

Hi Kermit..... Don't do that to me....! Erm, I have assumed (maybe wrongly) that by removing the amp and nothing else that the amp is the culprit?? The fuse is now pulling .03 as opposed to .10.. soooooo? In all honesty I'm just glad I don't have to jump her every bloody time which for the moment is a win... What are you thinking? What else do you think it could? Any way of checking the amp? Bearing in mind that I believe all electronics is witchcraft.

kermit_rr · Aug 21, 2023

how are you measuring the .02 and .1?

Datatek · Aug 21, 2023

Sounds like it could be the result of the typical water ingress.

Rallymantony · Aug 21, 2023

kermit_rr said:
how are you measuring the .02 and .1?

I have a doodad.......... Actually someone on here recommended it to another member. Not sure what its called but you pull the fuse and plug this in its place, it gives a read out on a small digit screen.

Rallymantony · Aug 21, 2023

Datatek said:
Sounds like it could be the result of the typical water ingress.

Hi Datatek, how's you? Yes I think you're right, there were signs that moisture had been present. This all started after she was parked up for a few months while I deliberated over what to do about a tranny issue, sitting vehicles up never does them any good, I think she just got damp

kermit_rr · Aug 21, 2023

i wanted to make sure you weren't measuring voltage drop, rather than actual amps, without asking leading questions

water ingress is a known issue and if you can see evidence then sounds very likely

backinblack · Aug 21, 2023

Sorry to do this to you but. May not be relevant to the 2007 but I think some subwoofer amps plug into the HK amp so maybe drawing current from the amp.

kermit_rr · Aug 21, 2023

backinblack said:
Sorry to do this to you but. May not be relevant to the 2007 but I think some subwoofer amps plug into the HK amp so maybe drawing current from the amp.

not checked directly but that sounds plausible, I've certainly noticed the sub amp draws its signal from the main amp (which makes no sense)

backinblack · Aug 21, 2023

Just looked at 2007 Rave and I think you've got away with it
"and a passive subwoofer as on the DSP system"

backinblack · Aug 21, 2023

2002 on, no reference to touch screen so that may differ again.

2007-2010

Rallymantony · Aug 21, 2023

kermit_rr said:
i wanted to make sure you weren't measuring voltage drop, rather than actual amps, without asking leading questions
water ingress is a known issue and if you can see evidence then sounds very likely

Thanks Kermit, genuinely appreciate you're input.. Can you advise on any other tests I should do before replacing the amp?

Rallymantony · Aug 21, 2023

backinblack said:
Just looked at 2007 Rave and I think you've got away with it
"and a passive subwoofer as on the DSP system"

I have no idea what you just said......! You lost me after 2007..

kermit_rr · Aug 21, 2023

Does it otherwise work? I'm not an expert but if it does then maybe something else isn't cutting the power like it should do? Not sure how that bit works but the head unit must send some kind of wake/sleep signal?

backinblack · Aug 21, 2023

Rallymantony said:
I have no idea what you just said......! You lost me after 2007..

RAVE is the downloadable workshop manual.

Rallymantony · Aug 21, 2023

kermit_rr said:
Does it otherwise work? I'm not an expert but if it does then maybe something else isn't cutting the power like it should do? Not sure how that bit works but the head unit must send some kind of wake/sleep signal?

Yes, all except the multi changer not being able to read the discs.

kjr640 · Nov 14, 2023

Rallymantony said:
Hello peoples

Not been on here for a while, it seems to have been up, work, bed, repeat for the last few months........ Anywho, I've had a serious power drain on my 322 for the last 6 or so months where the battery would go from fully charged to 7.6v within a few hours! Checked every fuse, researched all the usual suspects, replaced various non expensive bits............ Turns out it was the Harman Kardon amp in the boot! Now I said earlier that I checked every fuse, well the amp fuse was pulling 100 milliamps so originally I just pulled the fuse, when it made no difference I assumed that this wasn't the problem... I fully confess that I am worse then unless when it comes to auto electrics which is why its probably taken me so long to find the problem. So pulled the amp out and now all seems to be behaving itself.. Thought it was worth posting in case it helps someone else.. Now I just need to find a new amp or someone reliable to repair this one.. anyone?

When you say you pulled the amp out, what did you actually do? I’m going to try this later on my car so just want some instructions please

thanks

backinblack · Nov 16, 2023

I'm guessing he means he disconnected it. Mine is a 2005 and is buried behind here but yours may be different.

kjr640 · Nov 17, 2023

backinblack said:
I'm guessing he means he disconnected it. Mine is a 2005 and is buried behind here but yours may be different.

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Thanks a million, going to tackle this later. My car also came with a tracker which could be causing the battery drain.

Thanks so much !!

2007 L322 power drain resolved

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