Buick LaCrosse Owner's Manual page 347

If the vehicle fails to crank, it may
be jump started by using the eAssist
battery to charge the 12-volt battery.
Use the following procedure to
activate the on-board jump start
using the DIC controls.
1.
2.
3.
With the ignition key in the run
position, proceed as follows:
1. Press MENU (3) on the turn
signal lever until Vehicle
Information Menu is displayed.
Use (Thumbwheel) (2) to
scroll through the menu items
until Jump Start is displayed.
2. Press SET/CLR (1) to activate
the jump start.
3. The system will then ask for
confirmation. If yes is selected,
the jump start will begin and the
display will show JUMP START
ACTIVE, WAIT TO START.
4. When the jump start is complete,
the display will show JUMP
START COMPLETE. ATTEMPT
START.
If the vehicle is started, the
on-board jump start function will be
automatically disabled. If the vehicle
cranks but does not start, the
procedure may be repeated again.
If the vehicle start is still
unsuccessful, the jump start can be
attempted using the following jump
starting procedure under Jump
Starting (with or without eAssist).
On-board jump starting may be
unavailable due to the 12-volt
battery charge level, the eAssist
battery charge level, power
capability, or an issue with the
eAssist system. In these cases, the
display will not be available because
of the power issue, or the DIC will
display JUMP START DISABLED.
SEE OWNERS MANUAL.
For more information about the
vehicle battery, see
.
If the battery has run down, try to
use another vehicle and some
jumper cables to start your vehicle.
Be sure to use the following steps to
do it safely.