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WIRING PROVISIONS FOR 12-VOLT BATTERY POWER SUPPLY
The vehicle is equipped with wiring provisions for connecting 12-volt battery
power to customer installed equipment. Refer to the following information
when adding electrical accessories that will use the 12-volt power supply
circuits connected to the vehicle's electrical system. A wiring harness is
located below the instrument panel (IP) near the center of the vehicle and
another connection point is located in the left rear of the cargo area.
The 12-volt battery power for customer connection is supplied from the
Primary vehicle battery via control relays to four blunt cut 30-amp circuit
wires and from an Auxiliary battery via one blunt cut 50 -amp circuit wire in
the harness under the center IP. A blunt cut ground wire is also included in
the front harness. A 100-amp Rear Electrical Center (REC) stud is located in
the left rear cargo area.
The Primary battery is located at the right rear of the engine compartment
and the Auxiliary Battery is located at the left front of the engine
compartment. The Auxiliary Battery is connected to the vehicle charging
system via a relay which is closed when the ignition is ON.
Four 30-amp control relays and 30-amp fuses are located in the Underhood
Electrical Center (UEC).
Also in the UEC are two 5-amp fuses which connect control relay coils 1 & 2
and control relay coils 3 & 4 to the UEC primary battery bus. Refer to the
UEC label showing the 5-amp fuse locations 69 and 77, labeled "R/C" for
Run/Crank power and locations 70 and 78, labeled "V/Batt" for primary
battery power.
The 5-amp fuses for the control relays can be positioned to operate all
relays from the ignition buss or primary battery buss or one pair on ignition
and one pair on battery. See also Bulletin #118 at www.gmupfitter.com.
The four control relays are operated via separate blunt-cut wires located in
the harness under the instrument panel and are intended to be connected
via customer switching to vehicle ground.
The auxiliary power control relay control wires and the relay contact
30-amp load side wires for customer connection are identified as follows:
Blunt cut ignition control and signal wires are also in the harnesses under the
center IP and between the front seats.
AUXILIARY BATTERY POWER
REAR ELECTRICAL CENTER
A 100-amp battery voltage stud is located in the Rear Electrical Center (REC)
at the left rear of the cargo area. Removal of the vented trim cover in the
lower left quarter trim panel provides access to the REC, located to the rear
of the jack stowage compartment. A blunt cut ACCESSORY/RUN (Violet/
Yellow) circuit wire and a blunt cut RUN/CRANK (Violet/White) circuit wire
are coiled near the REC. The nut on the power stud must be torqued to
9Nm+0.5 when attaching other wires to the stud. The stud adjacent to the
rear of the 100 amp power stud is inactive.
2019 TAHOE 4X4
SPECIAL SERVICE
STANDARD EQUIPMENT
Control Relay Ground control wires:
•
Red/White...Control relay 1
•
Yellow/White...Control relay 2
•
Green/Grey...Control relay 3
•
White/Blue...Control relay 4
•
A Violet/Yellow circuit wire, hot in ACCESSORY/RUN. This circuit is also
provided in a coil in the cargo area near the REC.
•
A Violet/White circuit wire, Hot in RUN/CRANK. This circuit is also
provided in a coil in the cargo area near the REC.
•
A Yellow/Black circuit wire, transmission in Park signal. The circuit provides
switched 12-volt power when the transmission control is in Park and the
engine is running. The circuit is at 0 volts when the transmission control is
in any other position, i.e., R, N, D, L. Note that the circuit is at 12-volts when
the transmission is in Park and the ignition is in LOCK/OFF. To avoid the
possibility of undesired parasitic electrical load when the ignition is OFF, it
is recommended that the Park Signal circuit be isolated by a customer
furnished ignition control relay.
•
A Green/Gray circuit wire for Vehicle Speed signal providing 4000 pulses
per mile. The vehicle Electronic Brake Control Module (ECBM) Vehicle
Speed Signal (VSS) output circuitry does not include a logic pull-up
resistance. If a pull-up resistance is not part of the customer equipment
VSS input connection circuitry, a 5000 ohm resistor can be connected
between the vehicle VSS circuit wire and vehicle battery power.
•
A White/Blue circuit wire for 12-volts when the Service Brakes are applied.
•
Blue/White wire provides a pulsating 12 volt signal when a left turn is
selected
•
A Yellow/Gray wire provides a pulsating 12 volt signal when a right turn is
selected
•
All automatic lighting can be disabled when a ground is applied via a
customer-furnished wire terminated in BCM connector X2, terminal 18
A 100-amp battery voltage stud for customer connection is located
in the REC at the left rear of the cargo area. The ACCESSORY/RUN
(Violet/Yellow) and RUN/CRANK (Violet/White) circuits are coiled
near the REC.
Note: Vehicles equipped with (A95) Bucket Seats will have to remove trim
to access wiring
TIRE PRESSURE MONITOR
WITH TIRE FILL ALERT
The Tahoe Special Service Vehicle (SSV) is equipped with a Tire
Pressure Monitor System (TPMS) which warns of low tire pressure.
The Tahoe SSV has a full size spare which does not have a TPMS
sensor. When a flat tire has been repaired, remount the road wheel
soon to maintain proper operation of the TPMS.
Tire Fill Alert in addition to the DIC warning when a tire has low
pressure, this feature provides audible and visual indication
when air is being added to the low tire to aid in achieving
optimal tire pressure.
20
12-volt, 30-amp load wires:
•
Blue...Control relay 1
•
Grey/Black...Control relay 2
•
Yellow/Brown...Control relay 3
•
Red/Green...Control relay 4
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