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Key Switch circuit causing battery drain when switched off

 
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Andyzeg



Joined: 27 Apr 2019
Posts: 12

PostPosted: Mon May 06, 2019 11:55 am    Post subject: Key Switch circuit causing battery drain when switched off Reply with quote

Hi All

I'm trying to get to the bottom of a battery drain issue on my R51 2007. .6amp or 620milliamps when car is left switched off...which is way too high and has been draining my brand new battery in about a day and a half! It was 620 even when I completely unplugged the IPDM unit and took it out of the car!!

After checking with a multimeter in amp mode...and pulling every fuse, relay and plug that I could see, I discovered that the main culprit was the Key Switch because when I removed the fuse in the glove box, the amp drain dropped by 450milliamps!

So for a few days I have been pulling that 10a fuse when the car is left standing. The other amp hungry circuits are Electronic Parts (possibly the computer and radio presets?) and strangely...Room Lamp...which is weird because all the interior lights are permanently off. Why this seems to be drawing about 60 milliamps, I have no idea! (I will recheck this as I might be in error)

So, can anyone think of why the Key Switch circuit would be drawing 450milliamps when the car is off and standing? A possible clue is that the keyless ignition hasn't worked since I got the car..I therefore have to insert the key to start the car. Of course, with that fuse removed...I can't even turn the key! Lol!

What else could be affecting that circuit? Where should I look?

I may end up going to the local dealer...but I'm not sure if they would know either...
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ssobol



Joined: 24 Feb 2019
Posts: 15
Location: No. VA

PostPosted: Mon May 06, 2019 3:38 pm    Post subject: Reply with quote

Are you sure you really have a problem with the electrical system. I had a similar problem where the engine would not start after the truck was sitting overnight. I looked at the electrical stuff and had the battery tested and they said it was ok. Nothing conclusive was found. However, I ended up replacing the battery and everything has been fine. I just left my truck sit for 3 1/2 weeks and it started just fine.
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Andyzeg



Joined: 27 Apr 2019
Posts: 12

PostPosted: Tue May 07, 2019 4:50 am    Post subject: Reply with quote

ssobol wrote:
Are you sure you really have a problem with the electrical system. I had a similar problem where the engine would not start after the truck was sitting overnight. I looked at the electrical stuff and had the battery tested and they said it was ok. Nothing conclusive was found. However, I ended up replacing the battery and everything has been fine. I just left my truck sit for 3 1/2 weeks and it started just fine.


Yes! The battery is brand new. The drain on the battery is so high that it would discharge even the best batteries in 2 or 3 days.

Otherwise...why would other owners quote much lower offline amperage figures (10 times less)?

Something is definitely not right here...but I will figure it out somehow.
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Andyzeg



Joined: 27 Apr 2019
Posts: 12

PostPosted: Tue May 07, 2019 8:18 am    Post subject: Reply with quote

Here is the double (and triple) checked breakdown of my battery drain when the car is off and left alone :-

Fuses - from glove box fuse box -

Room Lamp = .08 Amps (80 mA)

Electronic Backup = .01 Amps (10mA)

Electronic Parts = .08 Amps (80mA)

Key Sw (itch) = .41 Amps (410mA)

With all these removed there is still .04 Amps (40mA) showing

Add all these up and it makes .62 Amps (620mA)

I'm no expert...but this seems very high to me. After a couple of days my brand new fully charged battery drops to 8 volts and hasn't got the power to get any of the circuits going...and not a chance of starting.

Are there any Nissan techs out there that could shed a light on this and hopefully give some advice?

My present solution is to pull out the Key Switch fuse when car is left standing...and then pop it back in to start and drive! Lol!
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