All Things Mk5 > How to Guides / Troubleshooting
Battery drain still happening... Completely stumped :( **UPDATE**
MJ:
Current drain test from the battery terminal, check their sleep status using live data on VCDS/vas or scope the wires, if there's anything other than a flat line then they're still drawing current.
Eddie-NL:
checking via battery terminal is not the way to check on a CAN system as it doesn't pin point where the issue is
Craigh1983:
--- Quote from: Eddie-NL on April 08, 2014, 03:44:33 pm ---checking via battery terminal is not the way to check on a CAN system as it doesn't pin point where the issue is
--- End quote ---
Well i'm going to try and test each fuse like you did Ed and see if I get anything from that. If not.. I'm getting rid of the car.
MJ:
--- Quote from: Eddie-NL on April 08, 2014, 03:44:33 pm ---checking via battery terminal is not the way to check on a CAN system as it doesn't pin point where the issue is
--- End quote ---
No but it will reveal if there's a voltage draw like on and 12v stand alone. It might not show what it at fault but it will prove a drain exists, hence the other two parts of the response which will pinpoint the issue.
What is the amp draw at the battery by the way?
ryanpp:
Hey,
I've had this issue too, and decided yesterday to pay VW £300 odd to do it. Just signed up to answer this :)
There were several reasons as to the drain:
- Alarm horn fault
- Aftermarket stereo - This was coded out of the ECU today, as when no VW stereo is present, the ECU CONSTANTLY searches for one.
- Auxiliary heater - This is the issue they are currently fixing, they believe there was a resistance to ground across something on the heater, hence the drain.
I'll update if I hear any more.
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