2012 CHEVROLET TAHOE engine

Black plate (3,1)Chevrolet Tahoe Police and Special Service Packages - 2012
Instruments and Controls 5-3
The Tahoe Special Service Package
instrument panel cluster is similar to
the Tahoe Police Package
instrument panel cluster, except that
the maximum speed displayed is
lower and additional indicators may
be present. See“Instrument Cluster”
in the Index of your owner manual
for more information.
Speedometer
Your speedometer lets you see your
speed in both miles per hour (mph)
and kilometers per hour (km/h). The speedometer for the Tahoe
Police Package (SEO PPV) displays
a maximum vehicle speed of
225 km/h (140 mph). The
speedometer for the Tahoe Special
Service Package (SEO 5W4)
displays a maximum vehicle speed
of 193 km/h (120 mph). The Tahoe
Special Service Package is not
designed nor intended for use in
high‐speed emergency vehicle
operations.
Odometer
Your odometer shows how far your
vehicle has been driven, either in
miles (United States) or kilometers
(Canada).
Information Displays
Driver Information
Center (DIC)
The Tahoe Police Package and
Special Service Packages do not
have DIC buttons. You can turn off
or acknowledge the available DIC
messages by using the trip
odometer reset stem located on the
instrument panel cluster.
The DIC will display engine running
hours.
See the owner manual for additional
information on the DIC.

Black plate (1,1)Chevrolet Tahoe Police and Special Service Packages - 2012
Lighting 6-1
Lighting
Exterior Lighting
Exterior Lamp Controls . . . . . . . . 6-1
Exterior Lighting
Exterior Lamp Controls
The following exterior lighting
features apply to vehicles first sold
in the United States.
The vehicle has Daytime Running
Lamps (DRL) and an Automatic
Headlamp System (AHS). The DRL
and AHS can be turned to OFF with
the headlamp switch when the
transmission is in P (Park) and the
engine is at idle. If the engine is not
turned off, the DRL and AHS will
remain OFF when the transmission
is placed in gear. The vehicle may
be driven with the lamps off for one
ignition cycle.
The vehicle may have been built
with SEO 9G8, DRL AND AHS
DISABLE. This feature turns off
DRL and AHS and requires manual
control of the exterior lighting. See
your dealer to restore the DRL and
AHS to normal operation.For vehicles first sold in Canada,
the DRL and AHS can be turned off
if the transmission is in P (Park).
See the owner's manual for more
information.
Special Features
The following standard features are
disabled in the Police Package and
Special Service Package.
.Entry Lighting and Exit Lighting
.Remote Keyless Entry Feedback
(Horn Beep) and (Lamps Flash)
Automatic Door Locking is standard.
If you need it disabled, see your
dealer.

Black plate (5,1)Chevrolet Tahoe Police and Special Service Packages - 2012
Driving and Operating 9-5
Starting and
Operating
Fast Idle System
While parked with the engine idling
for an extended period, turn off the
following factory equipment if
emergency lighting and
communication equipment are
operating:
.Air Conditioner
.Fan
.Rear Window Defogger
.Factory Audio System
See “Running the Vehicle While
Parked” in the owner manual.
Engine Idle Speed - Alternator
Output
Normal idle speed for the engine is
set for 600 rpm. To increase
alternator output while the
transmission remains in P (Park) or
N (Neutral), and the electrical load
on the alternator is large enough,
the engine idle speed can rise to as
high as 800 to 1000 rpm.
Towing
Trailer Towing
The Tahoe Police Package (SEO
PPV) is not intended to tow a trailer.
The Tahoe Special Service Package
(SEO 5W4) can be equipped for
trailer towing. See “Trailer Towing”
in the owner manual for more
information.

Black plate (7,1)Chevrolet Tahoe Police and Special Service Packages - 2012
Special Equipment Options 15-7
Blunt cut ignition controlled power
and signal circuits are also included
in the wire coiled under the
instrument panel near the center of
the vehicle. They include:
.*A yellow, 0.5 mm² (20 gauge)
circuit, Hot in ACCESSORY,
RUN or RAP (Retained
Accessory Power).
.A pink, 0.5 mm² (20 gauge)
circuit, Hot in START and RUN.
(7A maximum load)
.*A yellow/black, 0.5 mm²
(20 gauge) transmission park
signal. This circuit provides
switched power when the
transmission is in P (Park) and
the engine is running. The circuit
is at 0 volts when the
transmission is in any other
position, i.e., R (Reverse),
N (Neutral), D (Drive) or
M (Manual). Note that the circuit
is also at 12 volts with the
transmission in P (Park) and the
ignition in LOCK/OFF. To avoid
the possibility of undesired
parasitic electrical load with the
ignition in LOCK/OFF it is
suggested that the Park/Signal
circuit be isolated by routing it
through the normally open
contact of a customer furnished
ignition controlled relay.
.A dark green/white, 0.5 mm²
(20 gauge) Vehicle Speed Signal
(VSS) provides 4,000 pulses
per mile.*These two circuits share a 15 amp
fuse. (10 amp combined
maximum load)
Servicing Relays and Fuses
Fuse/Relay Center

Black plate (12,1)Chevrolet Tahoe Police and Special Service Packages - 2012
15-12 Special Equipment Options
Headlamps
Flasher Module —SEO 6J7
A 20 amp fuse protects the flasher
module circuit. This fuse is located
in the underhood fuse block in the
engine compartment on the driver
side of the vehicle and is labelled
HEADLAMP WASHER. See “Engine
Compartment Fuse Block” in the
Vehicle Care section of the Tahoe
owner manual for more information. When it is dark outside, the
taillamps will turn on automatically.
The Center High-Mounted Stoplamp
(CHMSL) will not flash and will
operate only when the regular brake
pedal is pressed.

Black plate (15,1)Chevrolet Tahoe Police and Special Service Packages - 2012
Special Equipment Options 15-15
Wiring Provisions for
Emergency Vehicle Roof
Light - SEO TRW
Battery power is supplied through a
30 amp fuse to a wiring harness
located in the roof. Power is
controlled with a switch located in
the overhead console. The
customer or vehicle upfitter must
complete the installation to an
added accessory such as an
emergency beacon lamp.
Maximum rated electrical load is
21 amps (250 watts). The added
electrical requirements must not
exceed 21 amps (250 watts).
Running the accessory for long
periods of time with the engine off
may run the battery down.Installation
Instructions
–Emergency
Vehicle Roof Panel Lamp
Wiring to the accessory can be
done by either directly connecting
the wire in the roof to the accessory
(Option A) or by using Wiring
Harness Package part number
12150250 obtained from GM
Service Parts (Option B).
A. 645 mm (25.39 in)
B. 440 mm (17.32 in)
C. 100 mm (3.94 in) square D. Roof Centerline
E. Roof Edge
1. Disconnect the negative (−)
battery cable at the battery.
2. Make the electrical connections using either option A or option B.
Notice: Pulling the wiring
harness through a panel hole that
has sharp edges may cause
damage to the wire and/or wire
insulation. Remove sharp edges
from the panel hole before pulling
the wire through it.
Option A: Roof Wires Directly to
Accessory
1. Drill a 10 to 13 mm (3/8 in to 1/2 in) hole in the outer roof
panel in the area shown in the
illustration. The hole should only
go through the outer panel.
Remove all sharp edges from
the drilled hole.
2. Remove the inside overhead console access panel/lamp
lenses.