So I've finally found the wiring diagrams on Elsa and I think I have found the two power points for the PDC.
Problem is I cant work out which is permanent & which is ignition?
I believe the fuse positions are:
Position of relays and fuses, from model year 2007
Fuses (SC) in fuse holder, driver side dash panel
SC4 - Fuse 4 on fuse holder C, nominal value 5A, Terminal 15
E128 - Heated rear left seat switch with regulator ¹)
E129 - Heated rear right seat switch with regulator ¹)
E226 - Tyre pressure monitor button
E256 - TCS and ESP button
E284 - Garage door operating unit
F4 - Reversing light switch ²)
G65 - High pressure sender
G238 - Air quality sensor
G266 - Oil level and oil temperature sender
J162 - Heater control unit ¹)
J255 - Climatronic control unit
J301 - Air conditioning system control unit ¹)
J401 - Navigation system with CD drive control unit ¹)
J446 - Parking aid control unit
J530 - Garage door operation control unit
J706 - Seat occupied recognition control unit
Y7 - Automatic anti-dazzle interior mirror
Z20 - Left washer jet heater element
Z21 - Right washer jet heater element
¹) not for models with US equipment
²) for models with manual gearbox only
SC14 - Fuse 14 on fuse holder C, nominal value 10A, Terminal 30
E313-Selector lever³)
F189-Tiptronic switch¹)²)
J104-ABS control unit⁴
J217-Automatic gearbox control unit¹)²)
J446-Parking aid control unit
¹) not for models with US equipment
²) for models with automatic gearbox (09G) only
³) for models with direct shift gearbox (02E) only
⁴
for models with anti-lock brake system (ABS) MK60 and hydraulic brake servo (HBV) only