Author Topic: 2010 2.0 Sport - Battery parasitic battery drain  (Read 3410 times)

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Offline Trebus

  • S Class
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  • Posts: 4
  • Engine: 2.0L
  • Fuel: Petrol
  • Transmission: Automatic
  • Trim: Sport
  • Year: 2010
2010 2.0 Sport - Battery parasitic battery drain
« on: February 17, 2021, 07:36:28 am »
Hi all,

Long time lurker but infrequent poster. Had my 6 for around 3 years, second owner and standard car. Has keyless entry and BOSE audio. I'm an aircraft electrician by trade so know my way around a multimeter.

The car has a parasitic drain of approximately 60mA when it's locked and ECU asleep. New battery in 2020 as it kept triggering the alarm with low voltage. Incidentally I still have the old battery and it does hold a charge when sat on the bench even though its capacity is diminished. Used ForScan to check operation of door latches last year and these all appear correct.

Plenty of research done on the subject of battery drain which appears fairly common on 6s, sadly not many 100% positive identifiers of the culprit. I've read that poor earth / grounds, BCM module, bluetooth or audio are all potentials.

I've pulled every fuse and monitoring the change in current. As for many, the ROOM fuse drops it down significantly to approx 15mA which I believe is normal. Trouble is, Mr ROOM runs a whole host of circuits based on the GH wiring diagram.

Datalink connector
Memory power seat
Courtesy light
Instrument cluster
Vanity mirror
Cargo compartment light
Information display
Audio system
Hands free telephone
Keyless entry
Headlight auto levelling
AFS adaptive front lighting system
Map light
Interior light
Trunk light
Heater + Air conditioner system

Getting to some of these items is more straightforward than others so just wondering if anyone had a similar problem and was able to narrow it down any further?

Offline Mungis

  • S Class
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  • Posts: 1
  • Gender: Male
  • Colour: Graphite Mica (38R) Metallic
  • Engine: 2.2L
  • Fuel: Diesel
  • Transmission: Manual
  • Trim: SE
  • Year: 2011
Re: 2010 2.0 Sport - Battery parasitic battery drain
« Reply #1 on: February 17, 2021, 10:47:50 am »
TREBUS 

Who knew, or could have guessed ?
Have a look at this youtube video  regarding a mazda3 room fuse !

https://www.youtube.com/watch?v=FXHNqir5Xso

Mungis

Offline Trebus

  • S Class
  • *
  • Posts: 4
  • Engine: 2.0L
  • Fuel: Petrol
  • Transmission: Automatic
  • Trim: Sport
  • Year: 2010
Re: 2010 2.0 Sport - Battery parasitic battery drain
« Reply #2 on: February 17, 2021, 01:29:50 pm »
Thanks Mungis,

Confirming no coins were inserted  ;D
Bit of a different issue as I have a drain rather than a ruptured fuse. But interesting all the same.

I think it will come down to removing the radio, bluetooth module etc one at a time to see if any make a difference. Or just keep plugging the trickle charger in  :)