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Driving and Driving Safety
191
Switching off PSM
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Press button
.
PSM is switched off after a short delay.
The light-emitting diode in the button is lit up.
When PSM is switched off, the PSM OFF
warning light on the instrument panel lights up
and
a message appears on the multi-purpose
display of the instrument panel.
With increased braking power
, the vehicle is
stabilized even when PSM is switched off.
One-sided spinning
of the wheels is prevented,
even with PSM switched off.
PSM should always be switched on during
“normal” driving.
However, it may be a good idea to switch off PSM
temporarily in exceptional situations:
– on a loose surface (e.g. on sand)
– in deep snow,
– when “rocking the vehicle free” and
– when using snow chains.
Information
When PSM is switched off, wheel-specific brake
interventions and the anti-slip regulation system
(ASR) are also inactive.
The automatic brake differential (ABD) remains on.
Switching PSM back on
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Press button .
PSM is active immediately.
The light-emitting diode in the button and the
PSM OFF warning light on the instrument panel
go out.
A message appears on the multi-purpose
display of the instrument panel.
– The PSM warning light on the instrument panel
lights up for a lamp check when the ignition is
switched on.
– The light indicates a control operation, even
when PSM is switched off, e.g. brake control in
the event of one-sided wheel spin.
– The light - in conjunction with the multi-purpose
display - indicates a fault.
The warning message “PSM failure” appears
on the multi-purpose display of the instrument
panel.
For information on warning messages on the
multi-function display:
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Please see the chapter “OVERVIEW OF
WARNING MESSAGES” on page 139.
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Adapt your driving style according to the
changed conditions.
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Consult your authorized Porsche dealer.
Collapsible spare wheel
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Never switch off PSM when driving with
a collapsible spare wheel.
Towing
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For information on towing:
Please see the chapter “TOWING” on
page 302.
PSM warning light