MK4 Golf electrical drain.

[big-ted]

Hi I hope someone can point me in the right direction, Have a 2003 golf 1.9 diesel ASZ. (not a VW person)

It has a flat battery due to a parasitic drain, It draws 0.5 amps with doors locked and closed down.

If I remove fuse 12 in fuse box listed as S12 on wiring diagram it drop to 0.17.

The wiring diagram shows it going to E15 Nav control unit which this does not have, and E52 Communication control unit.

What is the communication control unit and where does it reside.

Or could it be that by removing the fuse it shuts down the communication circuit and the CAN goes in to sleep turning off what ever consumer is the draw.

Im double bluffing myself so thought id ask on here for another pair of eyes.

Thanks

Ted


Just a note, it now brings the cooling fan on when the fuse is removed after starting and stopping the engine with it removed, I assume some sort of overheat protection like peugeots have ??

[Meat-Head]

ON TOPIC:-

1) on the gulf (not sure about all mk4) the fuse card is printed backwards
So (pretend) get the card showing the fuses, smear in glue, stick on the fuses, pull
The fuses out, there you go. So find one for wipers and pull it out. To verify

2) commicate modules telephone? Never seen one on a gulf

3) unplug the radio and cd 6 stack in trunk/glovebox/arm rest

4) trunk light and/or glovebox light

5) VAGUE MODE ACTIVE

UNDERA DASHBOARD DRivers side “silver fuse” 30a circuit breaker
For windows pull it & the bcm you got your nose on

6) look for cooling fan/ac module under hood (expansion bottle or jack it off
Under battery- not sure)


7) vaguely mode off

8) if pub quiz I would put “drivers window motor”

9) DONT FOR GETTING THE THANKS BUTTON!!!!!

[big-ted]

Hey Thanks Meat-head, the tip about the fuse card is spot on, even the diagram on Haynes pro is backwards.
Makes fuse 12 now fuse 16, looking more like fan control box under battery.

unplugging the A/C clutch drops 0.2 amps when car in sleep.

Its a side line job so will have another look during the week.

Thanks

Ted

[Meat-Head]

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THIS IS NOT QUITE WHAT YOU WANT.

https://www.ebay.co.uk/itm/FEBI-Radiator-Fan-Controller-39739/291847536068 (https://www.ebay.co.uk/itm/FEBI-Radiator-Fan-Controller-39739/291847536068?fits=Model%3AGolf&epid=1530689602&hash=item43f377fdc4:g:rXIAAOSwbrRbVoRS)?

have a snoop doggy snoop for something similar

THINK its the a/c module has 156 wires on it

[big-ted]

Got a Febi Unit from Parkers the parts eejits.
£30 sorted.

Thanks again Meat-Head.

Ted

[Meat-Head]

£30 for the a/c control unit, with 156 wires? Thats great result
expected new only from stealer

thought afterwards last one, someone had put long screws in and got the board
cost the pollack a fortune