Service manual

Body and Accessories Lighting Systems 8-119
2006 LSSV Service Manual Supplement
Description and Operation
Blackout (B/O) Lighting Circuit
Operation
Voltage for connector C8, the blackout (B/O) marker
lamps, is supplied through the accessory voltage circuit
YL (243) located in the I/P relay center. From there the
OG (40) wire supplies voltage to the blackout (B/O)
service switch. When the blackout (B/O) service switch
is placed in blackout (B/O) mode, voltage is applied to
the PK (911) wire to inline 5A fuse. Voltage is then
applied to the BN/WH (900) wire for front blackout (B/O)
marker lamps and BN/WH (900) wire for rear blackout
(B/O) marker lamps. Ground for the front blackout (B/O)
marker lamps is supplied through G100M for the front
and G903M and G902M for the rear.
The blackout (B/O) stoplamps voltage is supplied
through the stop LP fuse OG (1540) wire to the TCC/
stoplamp switch at all times. When the brake pedal is
depressed, the stoplamp switch is closed and powers
the WH (17) wire to the blackout (B/O) service switch.
When in blackout (B/O) mode, voltage is applied from
the DK GN/WH (902) wire to the blackout (B/O)
stoplamps. The blackout (B/O) stoplamps receive
constant ground through G903M and G902M.
Blackout (B/O) Lighting Description
This section focuses on the function and service of the
blackout (B/O) headlamp, the front and rear blackout
(B/O) marker lamps, and the service/blackout (B/O)
lamp switch. All other lamps are covered in the 2006
C/K Truck Owner Manual. As military options the
blackout (B/O) lamps provide a stealthy, low illumination
alternative to standard lighting systems, also available
on these vehicles. The blackout (B/O) headlamp is
identical on these vehicles. The front blackout (B/O)
marker lamps are mounted in the bumper of this
vehicle. The rear blackout (B/O) marker lamps are
arranged in the same relative position on the rear
bumpers.
The service/blackout (B/O) lamp switches, mounted at
the lower center dash, control blackout (B/O) lamp and
standard lamp functions. A pair of toggles operates
these switches. The blackout (B/O) drive toggle is
mounted on the right. When the service light toggle is
moved up to the ON position it activates all service
lights and enables all normal service light functions
elsewhere to be turned ON if needed. When moved to
the ALL OFF position this toggle shuts off all lamps and
auxiliary lamps. When the switch is moved to blackout
(B/O) ON only the blackout (B/O) lighting will work,
which includes the blackout (B/O) markers, front and
rear, and the blackout (B/O) headlamp. Within the rear
marker lamps are separate color markers. Yellow will
illuminate for the brakes and red will illuminate for drive
mode. The front markers illuminate in yellow. (The horn
is inoperative while the blackout (B/O) toggle is in the
ON position.) All warning lamps in the I/P remain
functional regardless of the toggle position. If the vehicle
is parked for over 24 hours, place the service switch in
the ALL OFF position.
To operate the blackout (B/O)/drive light switch pull it
out and up to the ON position; this will activate the front
blackout (B/O) headlamp. This will occur provided the
service light/blackout (B/O) switch remains in the ON or
down position. Pulling the left blackout (B/O) drive light
switch out and down to the OFF position will turn it OFF.
Releasing the switch from ON or OFF will cause it to
return to the center position automatically.
The following Exterior/Interior lights function tables are
for the service light/blackout (B/O) control switch and
clarify under what conditions various exterior and
interior lighting functions activate. Additional details are
found in the 2006 C/K Truck Owner Manual.
Topper Dome Lamp Circuit Description
When the ignition switch is ON, voltage is supplied from
the blackout (B/O) switch to the interior toggle switch on
circuit 912 (OG). The voltage leaves the switch on
circuit 800 (BR) or 803 (BN/WH) depending on the
switches’ position. The voltage on these circuits goes to
the rear toggle switch then to the topper dome lamp.
The lamp is ground on the CHMSL circuit.
Topper Dome Lamp Description
The topper dome lamp is controlled by two 3-way
switches and a lamp mounted switch. The interior
switch is mounted in the accessory panel and the other
is mounted on the left rear of the pickup bed. The switch
mounted on the lamp must be in the ON position for the
two 3-way switches to operate the lamp.
Voltmeter Lamp Circuit Description
When the headlamp switch is in the ON position voltage
is applied through the BN 9 wire and is grounded
through the BK 150 wire.
Voltmeter Lamp Description
The voltmeter lamp provides illumination to the
voltmeter mounted in the accessory instrument panel.