I know you said you checked your Option B wiring but did you check the SVS or just do option B? Did you check Earth points, plugs and wiring harness?
not sure how to check power to the SLABS unit (earthing etc), but I put a multimeter across the shuttle valves as per the link from The Good Oil (thanks Pedro) and they read within specs for both open, one closed, both closed.
without knowing where to put the multimeter I could only do a visual inspection of the wiring plugs, which all seemed ok - no corrosion, loose pins/wires etc
You dont need a Nanocom to check this.
How do you know you had an SVS fault?
last time I had a nanocom on it it read a historical fault - at that time I had had no problems in the 6 months I had owned the vehicle
AFTER you have checked all Earth points, Plugs, Wiring and Switches
My advice would be to take up Clubagreenies offer and get the codes read for you.
definitely
cheers
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