Parasitic draw on battery

keithsfleet

2000 VW Polo 1.4.

There's a very slow but steady draw on the battery, .01 volt every 2-3 minutes.

I've sat there with the voltmeter connected to the battery and pulled every fuse one by one. No joy in eliminating the draw.

It's throwing a 00532 code which is low power supply b for the airbag module. I've pulled the steering wheel off and checked all connections on the airbag, all good.

Any ideas which direction to go next?

Diesel

Switch the meter to read amps, inline with the battery (disconnect + and place meter between battery and lead).
Repeat your above test.
Make sure ALL fuses are tested one by one. Remember there are normally a second set in car interior.
If no change / drop at all, move to disconnect components 1x1. Start with easy ones, lamps etc before moving to starters/alternators. Leave PCBS like ECU's until last (in my opinion) as multiple inputs/outputs can send you down costly false replacements...

You 'Should' see a change in current flow somewhere in all that test.

Never a guarantee, but....., same make and model car some years back - interior boot light remained on - water on door switch.
Just took out the bulb !

Best of luck.
Diesel

keithsfleet

Never even crossed my mind to check amps, thanks Diesel.

I'll report back with my findings.