All Things Mk5 > How to Guides / Troubleshooting
Battery drain still happening... Completely stumped :( **UPDATE**
MJ:
Just the one
Craigh1983:
And is the clicking from the black 100 fuse in the engine bay fuse box normal? its ticking quite fast but you can defo hear it if you put your ear to it.
MJ:
Erratic Ticking or clicking from a relay is not usually normal but consistent or regular ticking is.
The siren would be controlled or regulated by the CCM o CEM. Usually no relay involved.
Craigh1983:
--- Quote from: MJ on April 11, 2014, 11:52:48 pm ---Erratic Ticking or clicking from a relay is not usually normal but consistent or regular ticking is.
The siren would be controlled or regulated by the CCM o CEM. Usually no relay involved.
--- End quote ---
Ah well its definitely not erratic but it is regular ticking.
So I take it if this siren is faulty, it is not letting the computer go to sleep and that's why the 6 fuses are drawing power?
MJ:
It's not that it doesn't let the Can bus sleep it just attempts to draw current to charge itself. The siren is a control unit in its own right and communicates via Lin bus single wire. If the master unit cannot see it then it continually sends a signal looking for it and also let's it draw current from the battery to charge itself, until the voltage stored reaches a set level. With a faulty cell this cannot be achieved, hence the drain - continuous draw.
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