Chevrolet 1979 Light Duty Truck Owner's Manual page 33

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Lock - Normal parking position. Locks the ignition and prevents
normal use of the steering wheel and shift controls. The key
cannot be returned to "Lock" and removed until shift lever is
placed in "Park" on automatic transmission models ("Reverse"
on 3 speed manual transmission models). (If you have a 4-speed
manual transmission, the "Lock" position prevents normal use of
the steering wheel. The key cannot be returned to "Lock" without
pressing down the key release lever.)
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Off You can turn the engine off without locking the steering
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wheel and shift controls.
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Run - Normal operating position. (On diesel engine vehicles
"Run" turns on the glow plugs. See your "Diesel Engine
Supplement.)
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Start - Cranks the engine.
If you have trouble turning the key to unlock the ignition, first be sure
the key is pushed in all the way. Then try to turn the steering wheel
as hard as you can in the direction the wheels are turned. At the same
time, turn the key with as much effort as you can apply with your hand.
Do not try to use a tool of any kind to apply more force on the lock
knob, as this could break the knob.
CAUTION:
On vehicles with floor-shift manual transmissions, if you
need to turn off the engine with the truck in motion, turn the key only
to "Off." DO NOT press down on the key release lever while turning the
ignition off. This will result in locking the steering wheel and loss of
steering control.
GUARD AGAI N ST TH EFT
Your new truck has many features to help prevent theft of the truck
itself, its equipment, and contents. But these anti-theft features
depend upon you to work.
THE TIME TO BE MOST ON GUARD IS WHEN LEAVING THE
TRUCK ...
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PARK IN
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LOCK THE STEERING COLUMN AND TAKE THE KEYS:
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Turn the key to "Lock" and remove the key. This locks the
ignition and both steering and shift controls unless your
truck has a floor-shift manual transmission. In that case, the
shift control is not locked.
•
If you must leave a key with the truck, leave the square-head
key only. Take the oval-head key with you. This will help
prevent illegal entry into your truck at a later date.
e
FULLY CLOSE ALL WINDOWS AND LOCK ALL DOORS.
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KEEP COSTLY ITEMS OUT OF SIGHT:
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Never leave things of value in plain sight on seat or floor.
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The glove box offers a place to hide small items.
A
LIGHTED SPOT WHEN YOU CAN.
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