Pull the fuse? or wire a switch inline with the fuse so you can turn it on/off.
I did this on my dad's old SHO. It had struts similar to 4C and a system called SARC. Semi-active ride control, under hard corners it would stiffen on its own and soften under slower cruising. With it off it was basically like turning Koni's on full hard.
Traction control (TC)
This function is designed to help reduce wheel spin by transferring power from a drive wheel that begins to lose traction to the wheel on the opposite side of the vehicle (on the same axle).
TC is most active at low speeds. This is one of the STC/DSTC's permanent functions and cannot be switched off.
Spin control (SC)
The spin control function is designed to help prevent the drive wheels from spinning while the vehicle is accelerating. Under certain circumstances, such as when driving with snow chains, or driving in deep snow or loose sand, it may be advisable to temporarily switch off this function for maximum tractive force.
Temporarily switching off Spin control
Press the DSTC button on the center control panel (see page 50) for at least a half a second. "DSTC SPIN CONTROL OFF" will be displayed and the indicator light in the button will go out.
Other S60 models
- Turn the thumb wheel (1) on the left-side steering wheel lever until the STC/DSTC menu is displayed.
- Hold down the RESET button (2) to toggle between STC/DSTC SPIN CONTROL ON or OFF.
Same dash as my 07 2.5t but when I turn the control on the turn signal one of the screens says DSTC on. That's quite odd that yours doesn't. Unless somehow or another the feature was removed or disabled.