ECU GMC SIERRA 2007 Service Manual

If you have any questions about this, you
should contact Customer Assistance before
you modify your vehicle. The phone numbers
and addresses for Customer Assistance
are in Step Two of the Customer Satisfaction
Procedure in this manual. SeeCustomer
Satisfaction Procedure on page 644.
Q:What if I added a snow plow? Will it keep
the airbags from working properly?
A:We have designed our airbag systems to work
properly under a wide range of conditions,
including snow plowing with vehicles that have
the optional Snow Plow Prep Package
(RPO VYU). But do not change or defeat the
snow plow’s “tripping mechanism.” If you
do, it can damage your snow plow and your
vehicle, and it may cause an airbag ination.
Q:Because I have a disability, I have to get
my vehicle modied. How can I nd out
whether this will affect my airbag system?
A:Changing or moving any parts of the
front seats, safety belts, the airbag sensing
and diagnostic module, rollover sensor
module, steering wheel, instrument panel,
overhead console, ceiling headliner, ceiling
and pillar garnish trim, roof-mounted rollover
airbag modules, or airbag wiring can affect the
operation of the airbag system. If you have
questions, call Customer Assistance. The
phone numbers and addresses for Customer
Assistance are in Step Two of the Customer
Satisfaction Procedure in this manual.
SeeCustomer Satisfaction Procedure on
page 644.
103

Keys............................................................ 109
Remote Keyless Entry (RKE) System........ 110
Remote Keyless Entry (RKE) System
Operation............................................... 111
Doors and Locks........................................ 118
Door Locks................................................ 118
Power Door Locks..................................... 119
Delayed Locking........................................ 119
Programmable Automatic Door Locks........ 119
Rear Door Security Locks......................... 120
Lockout Protection..................................... 120
Rear Doors............................................... 121
Tailgate..................................................... 122
Windows...................................................... 124
Manual Windows....................................... 124
Power Windows........................................ 125
Power Sliding Rear Window...................... 126
Sun Visors................................................ 127
Theft-Deterrent Systems............................. 127
Content Theft-Deterrent............................. 128
PASS-Key
®III+......................................... 129
PASS-Key®III+ Operation......................... 130Starting and Operating Your Vehicle......... 132
New Vehicle Break-In................................ 132
Ignition Positions....................................... 133
Retained Accessory Power (RAP)............. 134
Starting the Engine.................................... 134
Adjustable Throttle and Brake Pedal.......... 136
Engine Coolant Heater.............................. 136
Active Fuel Management™........................ 138
Automatic Transmission Operation............. 138
Tow/Haul Mode......................................... 144
Four-Wheel Drive...................................... 147
Parking Brake........................................... 162
Shifting Into Park (P)................................. 163
Shifting Out of Park (P)............................. 165
Parking Over Things That Burn................. 166
Engine Exhaust......................................... 167
Running the Engine While Parked............. 168
Mirrors......................................................... 169
Manual Rearview Mirror............................. 169
Automatic Dimming Rearview Mirror with
OnStar
®, Compass and Temperature
Display................................................... 169
Section 2 Features and Controls
107

Rear Door Security Locks
Your vehicle has rear door security locks. These
prevent passengers from opening the rear
doors from the inside.
The rear door security
locks are located on the
inside edge of each
rear door. You
must open the rear
doors to access them.
The label showing
lock and unlock
positions is located
near the lock.
To set the locks, do the following:
1. Insert the key into the security lock slot and
turn it so the slot is in the horizontal position.
2. Close the door.When you want to open a rear door when the
security lock is on, do the following:
1. Unlock the door using the remote keyless
entry transmitter, if the vehicle has one, the
power door lock switch, or by lifting the
rear door manual lock.
2. Open the door from the outside.
To cancel the rear door security lock, do the
following:
1. Unlock the door and open it from the outside.
2. Insert the key into the security lock slot
and turn it so the slot is in the vertical position.
Lockout Protection
This feature protects you from locking the key in
the vehicle when the key is in the ignition and
a front door is open.
If the driver’s side power door lock switch is
pressed when the driver’s door is open and the
key is in the ignition, all of the doors will lock and
then the driver’s door will unlock.
If the passenger’s side power door lock switch is
pressed when the front passenger’s door is open
and the key is in the ignition, all of the doors will
lock and then the front passenger’s door will unlock.
Security Lock
Label shown
120

Rear Doors
Extended Cab
Your vehicle may have a rear access door(s) that
allows easier access to the rear area of the
extended cab.
To open a rear access
door from the outside,
rst open the front door.
Then, use the handle
located on the front
edge of the rear access
door to open it.
You must fully close a rear access door before
you can close the front door.To open a rear access
door from the inside, the
front door must be
opened rst. Then, use
the handle located
on the inside of the rear
access door to open.
Crew Cabs
If your vehicle is a crew cab, you can open your
doors from the inside or outside. Your vehicle may
also have a feature which prevents children
from opening the rear doors. SeeRear Door
Security Locks on page 120for more information.
121

Tailgate
{CAUTION:
It is extremely dangerous to ride on the
tailgate, even when the vehicle is operated
at low speeds. People riding on the
tailgate can easily lose their balance and
fall in response to vehicle maneuvers.
Falling from a moving vehicle may result
in serious injuries or death. Do not allow
people to ride on the tailgate. Be sure
everyone in your vehicle is in a seat and
using a safety belt properly.On vehicles with a lock on the tailgate, use the
key to lock or unlock the tailgate.
Open the tailgate by lifting up on its handle while
pulling the tailgate toward you.
To shut the tailgate, rmly push it upward until it
latches.
After you put the tailgate back up, pull it back
towards you to be sure it latches securely.
122

Tailgate Removal
The tailgate can be removed to allow for different
loading situations. Although the tailgate can be
removed without assistance, you may want
someone to assist you with the removal to avoid
possible damage to the vehicle.
To remove the tailgate, do the following:
1. Raise the tailgate
slightly and release
both retaining
cable clips. To
release the retaining
cable clips, lift the
cable so it points
straight out. Lift the
clip over the
bolt, and push the
cable forward
then rotate down.2. With the tailgate about halfway open, lift the
right edge of the tailgate from the lower pivot.
On vehicles with the tailgate assist feature,
raise the tailgate nearly all the way to the
closed position prior to removing the left edge.
3. Move the tailgate to the right to release the
left edge.
Reverse this procedure to reinstall the tailgate.
Make sure the tailgate is secure.
123

Content Theft-Deterrent
Your vehicle may have a content theft-deterrent
alarm system.
To activate the theft-deterrent system, do the
following:
1. Open the door.
2. Lock the door with the Remote Keyless Entry
(RKE) transmitter. The security light should
come on and ash. The door does not need to
be open.
If the delayed locking feature is active, the
alarm will not be activated until all doors are
closed and the security light goes off.
3. Close all doors. The security light will stop
ashing and go off after approximately
30 seconds. The content theft deterrent alarm
is not armed until the security light goes off.If a door is opened without using the RKE
transmitter, a ten second pre-alarm will occur. The
horn will chirp and the lights will ash. If the key
is not placed in the ignition and turned to
START or the door is not unlocked by pressing
the unlock button on the RKE transmitter
during the ten second pre-alarm, the alarm will go
off. Your vehicle’s headlamps will ash and the
horn will sound for about two minutes, then
will turn off to save the battery power.
The theft-deterrent system will not activate if you
lock the doors with a key, the manual door lock, or
the power door lock switch. It activates only if you
use the RKE transmitter. You should also
remember that you can start your vehicle with the
correct ignition key if the alarm has been set off.
Here is how to avoid setting off the alarm
by accident:
If you do not want to activate the
theft-deterrent system, the vehicle should be
locked with the door key after the doors
are closed.
Always unlock a door with the RKE transmitter.
Unlocking a door any other way will set off the
alarm if the system has been armed.
128

If you set off the alarm by accident, turn off the
alarm by pressing unlock on the RKE transmitter or
by placing the key in the ignition and turning it
to START.
Testing the Alarm
The alarm can be tested by following these steps:
1. From inside the vehicle, lower the driver’s
window and open the driver’s door.
2. Activate the system by locking the doors with
the RKE transmitter.
3. Get out of the vehicle, close the door and wait
for the security light to go out.
4. Then reach in through the window, unlock the
door with the manual door lock and open the
door. This should set off the alarm.
If the alarm does not sound when it should, but
the vehicle’s headlamps ash, check to see if the
horn works. The horn fuse may be blown. To
replace the fuse, seeFuses and Circuit Breakers
on page 608.
If the alarm does not sound or the vehicle’s
headlamps do not ash, see your dealer for service.
PASS-Key®III+
The PASS-Key®III+ system operates on a radio
frequency subject to Federal Communications
Commission (FCC) Rules and with Industry
Canada.
This device complies with Part 15 of the FCC
Rules. Operation is subject to the following
two conditions:
1. This device may not cause harmful
interference.
2. This device must accept any interference
received, including interference that may
cause undesired operation.
This device complies with RSS-210 of Industry
Canada. Operation is subject to the following
two conditions:
1. This device may not cause interference.
2. This device must accept any interference
received, including interference that may
cause undesired operation of the device.
Changes or modications to this system by other
than an authorized service facility could void
authorization to use this equipment.
PASS-Key
®III+ uses a radio frequency
transponder in the key that matches a decoder
in your vehicle.
129

PASS-Key®III+ Operation
Your vehicle has PASS-Key®III+ (Personalized
Automotive Security System) theft-deterrent
system. PASS-Key
®III+ is a passive theft-deterrent
system. This means you do not have to do anything
special to arm or disarm the system. It works when
you transition the key to RUN, ACCESSORY or
START from the OFF position.
When the PASS-Key
®III+ system senses that
someone is using the wrong key, it prevents the
vehicle from starting. Anyone using a
trial-and-error method to start the vehicle will be
discouraged because of the high number of
electrical key codes.
If the engine does not start and the security light
on the instrument panel cluster comes on
when trying to start the vehicle, the key may have
a damaged transponder. Turn the ignition off
and try again.If the engine still does not start, and the key
appears to be undamaged, try another ignition
key. At this time, you may also want to check the
fuse, seeFuses and Circuit Breakers on
page 608. If the engine still does not start with the
other key, your vehicle needs service. If your
vehicle does start, the rst key may be faulty. See
your dealer who can service the PASS-Key
®III+
to have a new key made. In an emergency,
contact Roadside Assistance.
It is possible for the PASS-Key
®III+ decoder to
learn the transponder value of a new or
replacement key. Up to nine additional keys may
be programmed for the vehicle. The following
procedure is for programming additional keys only.
If all the currently programmed keys are lost or
do not operate, you must see your dealer or
a locksmith who can service PASS-Key
®III+ to
have keys made and programmed to the system.
130

See your dealer or a locksmith who can service
PASS-Key®III+ to get a new key blank that is cut
exactly as the ignition key that operates the system.
To program the new additional key do the
following:
1. Verify that the new key has a
1stamped
on it.
2. Insert the original, already programmed, key
in the ignition and start the engine. If the
engine will not start, see your dealer
for service.
3. After the engine has started, turn the key to
OFF, and remove the key.
4. Insert the new key to be programmed
and turn it to the RUN position within
ve seconds of removing the original key.5. The security light will turn off once the key
has been programmed.
6. Repeat Steps 1 through 5 if additional keys
are to be programmed.
If you are driving and the security light comes on
and stays on, you may be able to restart your
engine. Your PASS-Key®III+ system, however,
may not be working properly and must be serviced
by your dealer.
If you lose or damage your PASS-Key
®III+ key,
see your dealer or a locksmith who can service
PASS-Key
®III+ to have a new key made.
131