On a hot summer day S&S system switch off itself completely while is outside temperature is above 34 degrees C. When demisting is activated, engine would not stop. Actually, here it is what manual say:
STOP mode is not invoked principally when:
- the vehicle is on a steep slope (up or
down),
- the driver's door is open,
- the driver's seat belt is not fastened,
- the vehicle has not exceeded 6 mph (10 km/h)
since the last engine start by the driver,
- the electric parking brake is applied or
being applied,
- the engine is needed to maintain a
comfortable temperature in the passenger
compartment,
- demisting is active,
- some special conditions (battery charge,
engine temperature, braking assistance,
ambient temperature...) where the engine is
needed to assure control of a system.
In this case, the "ECO" warning lamp
flashes for a few seconds then goes
off.
This operation is perfectly normal.
Further:
The presence of this label, in particular
with the Stop & Start system, indicates
the use of a 12 V lead-acid battery with
special technology and specification;
the involvement of a PEUGEOT dealer
or a qualified workshop is essential
when replacing or disconnecting the
battery.
After refitting the battery, the Stop &
Start system will only be active after a
continuous period of immobilisation of the
vehicle, a period which depends on the
climatic conditions and the state of charge
of the battery (up to about 8 hours)
Anyhow, I find no reason to switch the system of by myself, when in Stop, engine started before I put in the 1st, so no difference engine run or not.
Actually, when I'm in car I almost forget that this system do something at all.