GMC Duramax Diesel 2015 Owner's Manual page 71

9-44 Driving and Operating
then be on steady. The SET and
+RES cruise control buttons can
then be used to establish the
desired PTO operating speed.
For remote PTO operation:
Press and release the PTO remote
arm switch, then within
five seconds, press and release the
PTO remote engine start/shutdown
switch. The PTO remote set switch
can then be used to establish the
desired PTO operating speed.
Additional information is available
in the service manual for the
correct wiring configuration and
programming of the remote PTO
enable and set switches. These
switch connections are accessed
through the PTO upfitter connector,
located on the chassis frame,
behind the vehicle compartment.
Enabling Conditions
To engage mobile PTO operation,
the following conditions must be met
prior to turning on PTO:
The engine must be running.
The vehicle speed must be less
than the PTO top vehicle speed
limit. The default setting is
94 km/h (58 mph). This limit can
be adjusted by a service
technician.
The shift lever may be in M1, M2
or M3. When placed in M2 or
M3, the vehicle will upshift
according to engine RPM set
point and vehicle speed.
The brake must be pressed and
then released. The brake must
then remain released.
Cruise control cannot be
enabled or active.
Engine speed must be less than
the maximum allowed PTO
engage speed of 1500 rpm.
Press and release the PTO in
cab switch. The PTO indicator
Mobile PTO
light will blink fast until the PTO
load becomes engaged, at which
point the indicator light will be on
steady. The SET and +RES
cruise control buttons can then
be used to establish the desired
PTO operating speed. See
Variable PTO Mode and PTO
Switch Operation later in this
section.
DIC WARNING MESSAGES
One or more of the following Driver
Information Center (DIC) messages
may appear if the PTO will not
engage. The operator must take the
action indicated, then attempt to
re-enable PTO.
PTO: SHIFT TO PARK OR
NEUTRAL (Stationary only)
PTO: SET PARK BRAKE
(Stationary only)
PTO: PRESS & RELEASE
BRAKE (Mobile only)
PTO: RELEASE BRAKE
PTO: REDUCE VEHICLE
SPEED
PTO: REDUCE ENGINE SPEED
PTO: DISENGAGE CRUISE
CONTROL (Mobile only)