fuse CHEVROLET TAHOE 2012 3.G Owners Manual

Black plate (2,1)Chevrolet Tahoe Police and Special Service Packages - 2012
15-2 Special Equipment Options
SEO Standard
Options
SEO Standard Options -
Police Package and
Special Service Package
Notice:GM cannot be
responsible for any changes
made to the vehicle. Have all
electrical and body modifications
performed by experienced
technicians.
.Be sure that any modified or
added wiring will work
properly with your vehicle's
wiring system.
.See that all wiring is properly
protected by fuses, and not
causing an overload to
connectors and components.
.Do not route wiring in areas
of the vehicle where
temperatures can be high or
where wiring may be cut,
pinched or rubbed.
.See that all added wiring is
of the same or smaller gauge
than the wire it is being
attached to for proper fuse
protection.
.Be sure that all holes drilled
in the body are properly
sealed and corrosion
protected. See that the
vehicle's wiring harnesses,
piping and other components
have not been displaced or
damaged during customer
installations of equipment
and wiring.
Wiring Provisions for
12-Volt Battery Power
Supply

Black plate (5,1)Chevrolet Tahoe Police and Special Service Packages - 2012
Special Equipment Options 15-5
The vehicle is equipped with wiring
provisions for a 12-volt battery
power supply. Refer to the following
information when adding electrical
accessories that will use the 12-volt
power supply feeds connected to
the vehicle's electrical system. The
wiring harness is located below the
instrument panel near the center of
the vehicle. The following
information describes the breaker
and relay location and provides a
wiring diagram to aid in connecting
customer equipment.
Electrical Connections
Notice:Before modifying or
adding any wiring, be sure that it
will work properly with your
vehicle's wiring system. Because
there are so many modifications
that can be made for many
different bodies and accessories,
GM cannot take responsibility for
any changes made. Such
changes may not be covered by
your GM Warranty. Have the work
done by an experienced electrical
technician. All wiring must be properly
protected by fuses, etc. and must
be routed properly so that it will
not be cut, pinched or rubbed by
other parts of the vehicle. Do not
route wiring in areas where it will
be very hot. Be sure not to
overload the vehicle's wiring,
connectors and components. All
added wire must be at least the
same size as the wire being
attached to for proper fuse
protection.
Installation Instructions
–12‐Volt
Accessory Power Supply
1. Disconnect the negative (−)
battery cable at the battery. The
negative (−) battery cable must
be disconnected before the
positive wiring lead is connected
to the power accessory.
2. Locate the power supply harnesses, one under the
instrument panel near the center
of the vehicle, and one within the
driver side rear cargo area jack
stowage compartment. 3. Prepare the wires that are to be
used to connect the power
accessory. Do not remove the
unused wires. Tape unused
wires back in their original
position under the instrument
panel.
4. Complete the wiring installation of the customer added
accessory with additional wire
required for the specific
electrical accessory power
connection. The wire gauge,
3.0 mm² (12 gauge), should be
the same as the wiring of the
installed harness.
5. The ignition must be turned to OFF prior to attaching the cables
to the battery, or serious damage
to the Body Control Module
(BCM) may result.
The windshield wiper switch and
the radio must be turned off
before attaching cables to the
battery.

Black plate (6,1)Chevrolet Tahoe Police and Special Service Packages - 2012
15-6 Special Equipment Options
6. Reconnect the negative (−)battery cable to the battery.
Torque the bolt to 5 Y
(3.6 lb ft).
7. Reset the clock time and radio pushbuttons as desired.
The 12‐volt battery power is
supplied through two underhood
mega fuses, one 125 amp and one
60 amp. This underhood power is
fed to the breaker/relay center via a
harness that passes through the
driver side front of the dash, and
routes across the instrument panel
to a position forward of the glove
box. The breaker/relay center is
mounted to the instrument panel
structure forward of the glove box.
The center includes a plastic
bracket, two relays, two 30 amp
breakers and three 50 amp mega
circuit breakers. Two 30 amp breakers supply power
from the underhood 60 amp mega
fuse through the contacts of the
control relays to 3.0 mm² (12 gauge)
blunt cut wires. These two blunt cut
leads are part of wire coil under the
instrument panel near the center of
the vehicle.
Each relay is operated by a 0.5 mm²
(20 gauge) blunt cut, light or dark
blue control lead included in the
122 cm (4 ft) loop of wire coiled
under the instrument panel.
Three 50 amp mega circuit
breakers, protected by three fusible
links, supply power directly from the
underhood 125 amp mega fuse
through three, 5.0 mm² (10 gauge)
wires. Two of the wires are routed
through the body harness to buss
junction blocks in the left rear of the
cargo area and secured near the
jack and tools. This 122 cm (4 ft) of
coiled wires can be accessed by
removing the cup holder on the top
of the trim panel. The third 5 mm²
(10 gauge) wire is a blunt cut lead
which is part of the 122 cm (4 ft)
loop of wire coiled under the
instrument panel near the center of
the vehicle.
An 8 mm² (8 gauge) ground lead is
also provided, and it is located
under the front passenger sill plate.
It can be accessed by removing the
sill plate and pulling the loop of wire
at the front of the plate. The lead is
122 cm (4 ft) long.

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 (8,1)Chevrolet Tahoe Police and Special Service Packages - 2012
15-8 Special Equipment Options
Enlarged View of the Fuse Block
A. Relays and Circuit Breakers
B. Front of the Vehicle
C. Floor of the Vehicle
D. Glove Box
E. Tab
The following information tells how
to access the vehicle's relay and
breaker center for checking and
replacing breakers. The breaker and relay center is
located behind and above the
instrument panel storage
compartment. Remove contents
from the storage tray. Using the tab
at the back of the compartment,
drop the tray down gently toward
the floor. It will hang from the hinge.
The breaker/relay center is located
above the right rear corner of the
storage compartment. The bracket
is attached to the instrument panel
structure with two screws.
Replace a 30 amp circuit breaker
with GM Part No. 12182117 circuit
breaker, or equivalent. Replace a
relay with a GM Part No. 12193604
relay, or equivalent. Replace a
50 amp circuit breaker with a GM
Part No. 15319848 circuit breaker,
or equivalent.
Reinstall the storage tray into the
compartment by lifting it into the
instrument panel.
Auxiliary Battery Power
Junction Blocks
Two auxiliary power junction blocks
are located within the driver side
rear cargo area jack stowage
compartment. Each junction block is
powered directly from the battery
through a 50 amp circuit breaker for
connection to customer‐furnished
equipment. The two circuit breakers
are located in the breaker/relay
panel forward of the instrument
panel glove box. A maximum load of
50 amps (600 watts) can be
connected to each junction block.
The wiring diagram for this circuit is
shown as part of the diagram for
“Wiring Provisions
–12 Volt Battery
Power”.

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 (14,1)Chevrolet Tahoe Police and Special Service Packages - 2012
15-14 Special Equipment Options
Inactive Rear Door
Handles - SEO 6B2
Your vehicle may be equipped with
inactive door handles. The rear
doors can only be opened from the
outside.
Inactive Rear Door
Locks - SEO 6N6
Your vehicle may be equipped with
inactive rear door locks. The rear
door locks do not lock or unlock at
the door. Only the driver power door
lock switch locks or unlocks the rear
door locks.
Inactive Rear Door
Windows - SEO 6N5
Your vehicle may be equipped with
inactive rear door window control
switches. Only the driver power
window switches can operate the
rear windows.
Spotlamp - SEO 7X6
Spotlamp–Windshield Pillar
Mounted
A Unity Series 330, high intensity,
100 watt halogen (H3 bulb) 15 cm
(six inch) spotlamp is mounted in the
left windshield pillar. The lamp is
protected by a 15 amp fuse located
in the underhood electrical center.
See the service manual for lamp
replacement procedures.
Spotlamp Harness –SEO 7X6,
SEO 7X7
Spotlamps - SEO 7X7
SEO 7X7 includes a driver side and
a passenger side spotlamp located
in the windshield pillars. Each
spotlamp is protected by a separate
15 amp fuse located in the
underhood electrical center.
For spotlamp bulb replacement
procedures, see the appropriate
section of the service manual.

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.

Black plate (20,1)Chevrolet Tahoe Police and Special Service Packages - 2012
15-20 Special Equipment Options
Maintenance
The emergency roof light circuit is
fed from the fuse labeled Sunroof
located in the underhood electrical
center. Always replace the fuse with
a 30 amp mini-fuse.
Wiring Provisions
for Horn/Siren
Circuit - SEO 6J4
This provision permits customer
connection of a switch to select
either horn or siren operation when
the horn pad is pressed.A 0.35 mm² (22 gauge) wire is
connected to an in-line connector in
the horn circuit of the instrument
panel harness under the instrument
panel. The end of this harness
extension is in a 1.5 m (5 ft) loop of
wire coiled under the center of the
instrument panel.