Ignition Lock System Description; Auto Trans Shift Lock Control Description; Auto Trans Shift Lock Control Ircuit Description; Supplemental Inflatable Restraint Description - GMC chervolet camaro 1999 Service Manual

Steering
Handle the column with care when removing
the column.
• Do not use a steering wheel puller other than the
one recommended.
• Do not hit the end of the steering gear coupling
shaft (26) sharply.
• Do not lean on the column.
• Do not drop the column.
Disregarding the above suggestions could shear or
loosen the plastic fasteners that keep the column rigid.
Ignition Lock System Description
The automatic transmission uses a park lock system.
This system uses a flexible automatic transmission park
lock cable. The cable is attached at one end to the
automatic transmission control lever and at the other
end to the ignition switch. The ignition switch is
mounted to the column where it actuates a locking pin.
The locking pin engages an ignition switch sliding
contact when the lever is in the REVERSE position.
This action does not allow the ignition switch to move to
the LOCK position.
With the lever in PARK and the ignition switch slider in
LOCK, the following actions occur:
• The locking pin engages a cam on the cable.
• The locking pin prevents the lever from moving
into another position.
Vehicles with a manual transmission have a steering
column key release lever. A manual transmission
clutch start switch is also used. Depress the clutch in
order to crank the engine.
Auto Trans Shift Lock Control Description
The auto trans shift lock control (ATSLC} system
prevents the driver from shifting out of the PARK
position without simultaneously pressing the brake
pedal. When energized, the ATSLC solenoid locks the
automatic transmission control lever.
When pressure is applied to the brake pedal, the
following actions occur:
• The ATSLC solenoid is de-energized.
• The ATSLC releases the automatic transmission
control lever.
Steering Wheel and Column - Tilt 2-109
Auto Trans Shift Lock Control Circuit
Description
• The brake/transmission shift interlock requires that
the brake pedal be depressed and the ignition
switch be placed in the RUN or ST ART position
before the transmission may be shifted from the
park position. When the vehicle is in the RUN or
START position, voltage is supplied to the Brake
Transmission Shift Interlock (BTSI} solenoid
through the GUAGES Fuse 9, circuit 39, the
stoplamp switch, and circuit 1135. Ground is
provided to the BTSI solenoid through G 110,
circuit 451, the park neutral position switch
PARK position, and circuit 434/816. When the
BTSI solenoid is energized there is a restrictor arm
that holds the shift lever arm in place. When the
brake pedal is depressed, the switch within the
stoplamp switch opens cutting off voltage to the
BTSI solenoid. When the BTSI solenoid is
de-energized the restrictor arm moves clear of the
shift lever arm. This allows movement of the park
neutral position switch from the PARK position to
any other position.
• If the vehicle is in the NEUTRAL position the gear
selector will not shift until the brake pedal is
depressed. This is similar to the PARK position as
described above.
• In order to override the shift interlock system turn
the ignition switch to the OFF position. This
removes battery voltage from the BTSI solenoid,
de-energizing the solenoid allowing the vehicle
to shift.
Supplemental Inflatable Restraint
Description
The supplemental inflatable restraint (SIR} helps
supplement the protection offered by the driver's seat
belt. This is accomplished by deploying an air bag
from the center of the steering wheel during frontal
crashes. The air bag deploys when the
following conditions exist:
• When the vehicle is involved in a frontal crash of
sufficient force.
• When the crash site is up to 30 degrees off the
centerline.
The steering column is collapsible. Inspect the
steering column after an accident has occurred
whether or not the air bag deployed.
The following components are the SIR system
components in the steering wheel and steering column:
• Inflatable restraint steering wheel module
• The SIR coil
Refer to Supplemental Inflatable Restraint (SIR} for a
detailed description of these components.