Cadillac 2005 XLR Owner's Manual page 83

Driver Shift Control
The driver shift control feature gives you more manual
control over the operation of the transmission.
A plus symbol will also appear on the shift console
above the AUTOMATIC OVERDRIVE (D) indicator and
minus symbol will appear below the indicator.
To request an upshift, briefly move the shift lever up
toward the plus symbol. To request a downshift, briefly
move the shift lever down toward the minus symbol.
To use this feature,
move the shift lever
from the AUTOMATIC
OVERDRIVE (D) position
to the left and into the
driver shift control gate.
The Head-Up Display (HUD) will display the change in
gear range, though the actual upshift or downshift
may be delayed until the engine speed is correct for the
requested gear range.
The currently selected gear will be remembered as
the selected gear range and will be displayed in
the HUD. See Head-Up Display (HUD) on page 3-34.
The gear range indicated in the HUD is only a requested
range of available gears. It does not indicate that the
vehicle will operate only in that specific gear. The actual
gear the vehicle will choose depends on a combination
of the driver-requested gear range, vehicle speed
and throttle position.
Notice: If you drive your vehicle at high rpms
without upshifting while using Driver Shift Control
(DSC), you could damage your vehicle. Always
upshift when necessary while using DSC.
If you do not upshift as the engine approaches the
redline engine rpm for the selected gear range,
an engine speed limiter will prevent over-revving by
limiting the engine rpm available.
Not all manual downshift requests will be accepted by
the transmission. To prevent over-revving the engine,
each gear range has a maximum vehicle speed
associated with it. Any downshift request above this
speed will be ignored by the transmission.
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