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Mysterious power draw, even with all fuses pulled..


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2009 Boxster, base w PDK, stock except for springs, sway bars and front LCAs. When locked, it draws around 1.5A, then it goes down to 0.1 or so for a few seconds, then back up to 1.5A.

When it goes back up, there is a faint motor noise in the dash somewhere, like a blend door actuator (but it's not, it also draws 1.5A when I disconnect the HVAC controller). SO I started pulling fuses and even with all fuses removed, it still draws about 0.3A. What's interesting is that when I pull row B fuse 3 (control units for seats, steering column, TPMS, Alarm and tilt sensor), the current goes from 1.5A to 1.1A and when I pull row D fuse 10 (PCM 3 Terminal 30), it drops by another 0.5 A to 0.6A. It looks like some control module is keeping the whole car from going to sleep. I found a wedged fuel door actuator (bushing was missing) but after I fixed that, the power draw is unchanged.

Any ideas what it could be?

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  • 2 weeks later...
Posted (edited)

Hooked up the PIWIS and found all kinds of low voltage and CAN codes, I cleared them all and none came back. The only active code was PDK - U0418 CAN fault, brake.

Would that cause  the car not to go into sleep?

I drove it around to clear the PSM steering sensor code and locked it. I'll check the codes again in a few hours.

Edited by guzerone
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