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Iona Disko
Member Since: 04 Jul 2008
Location: NE
Posts: 286
  
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| Do split charge systems cause D3 computer faults? |
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I have a theory...
I have a dual battery system with automated split charge control.
When the electrical systems are at full stretch (6 aux lights, heated seats, heated screens, etc) and the vehicle has just been started there is a risk that switching in an aux battery causes a power brown-out to the electronic systems resulting in spurious faults - amoung the most common being trnasmission failure, suspension failure, HDC unavailable and all topped off with a sprinkling of EPB failure.
I have noticed this several times now and have finally correlated the appearance of such faults with the timed cut-in of the split charge.
Anyone else have similar experiences?
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 5th Dec 2008 12:28 pm |
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Bodsy
Site Sponsor
Member Since: 06 Nov 2006
Location: In the Clubhouse
Posts: 21361
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Never had this issue with mine, but only running 3xdvd, 1xCB, fridge and Entel Charger is the highest load I've had on mine. But it is one of the Traxide ones  Bodsys Brake Bible
D4/D3 Remote FBH heat kits
BAS Remaps/ EGR Blank
Transmission Flush
Software updates/enabling
Clock/ SNOTM /3Flash / 4x4Info /BT Update /Service Reset/Error Codes / Gearbox Reset
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| 5th Dec 2008 1:11 pm |
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heine
Member Since: 07 Feb 2007
Location: Midrand
Posts: 4054
 
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How flat is your aux battery when this happens (or does it do it continously) . I run 4 Aux batteries and have no issues at all . Possibly the battery or the split charger is faulty and drawing very high amps . Or the alternator is suspect
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| 5th Dec 2008 1:55 pm |
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drivesafe
Member Since: 23 Feb 2006
Location: Gold Coast, Australia
Posts: 867
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Hi Iona, there are known problems like what you are experiencing, caused by some types of split charge systems, but have you tried disconnecting your split system to see if the problems still occur. 2008 TDV8 RR Lux + 2009 D4 2.7
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| 6th Dec 2008 9:30 am |
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Iona Disko
Member Since: 04 Jul 2008
Location: NE
Posts: 286
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Neither battery has been particularly flat during problems.
I just wonder if there is an inrush current when charging batteries in the same way you might get from a coil on a transformer or bulb. Don't know enough about the business of battery charging myself.
I ran the car for some time with do dual battery system at all and there was no problem.
I have also had a proble with the alternator belt and that has now been changed - it was slipping in water and had what was described to me as a slit in it.
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| 6th Dec 2008 9:31 pm |
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