Lighting 2-41
the engine running. The AHBA system consists of a
front camera module that detects light, and is able to
identify approaching vehicles on an even, straight road
at a distance of greater than 0.4 km (0.25 mi). The front
camera module analyzes light color, intensity, and
movement. The AHBA system will turn OFF the high
beam headlamps when approaching vehicle
headlamps or preceding vehicle taillights are detected
by the front camera module. The AHBA system is
turned off anytime the headlamp switch is moved out of
the AUTO position.
AHBA System Activation
• Vehicle ON
• Headlamp switch placed in the AUTO position
• Outside lighting conditions must be dark
• Vehicle speed greater than 25 mph (40 km/h)
AHBA System Operation
The following are conditions that the AHBA system will
turn the high beam headlamps off during operation:
• The system detects approaching traffic headlamps
• The system detects preceding traffic tail lamps
• Ambient light level too high due to towns or twilight
situations
• The vehicle’s speed drops below 13 mph
(22 km/h)
• Delay
Note: AHBA may not operate properly if any of the
following conditions exist:
• Approaching and preceding vehicles lamps are
undetectable due to dirt, snow, road spray, smoke,
fog, or any other airborne conditions.
• The front camera module is covered with ice, dirt,
snow, haze, or is obstructed.
• The vehicle is being driven on winding or hilly road
conditions which would make any on coming
vehicle headlamps undetecta ble by the AHBA.
AHBA System Deactivation
• Manually operating the headlamp switch from
neutral to high beam position
• AHBA is deactivated automatically when the front
or rear fog lamps are turned ON
AHBA System Indicator
The status of the AHBA system is shown by a green
indicator located on the instrument panel cluster. When
AHBA is active, the indicator will be illuminated
continuously. If the operator deactivate s the AHBA
system, the indicator will turn off.
Daytime Running Lamps
The daytime running lamps (DRL) will illuminate
continuously when the following conditions are met:
• Engine running
• The headlamp switch is in the AUTO position
• Ambient light conditions are daytime conditions
The B10D Sun Load and Ambient Light and Security
Indicator Sensor is used to monitor outside lighting
conditions. The ambient light sensor provides a voltage
signal that will vary between 0.2 and 4.9 volts
depending on outside lighting conditions. The K9 Body
Control Module (BCM) provides a 5 volt reference
signal and a low reference ground to the ambient light
sensor. The BCM monitors the ambient light sensor
signal circuit to determine if outside lighting conditions
are correct for either daytime running lamps (DRL) or
automatic lamp control when the headlamp switch is in
the AUTO position. In daylight conditions the BCM will
send a serial data message to the K219 Lighting
Control Module to command the DRLs ON, the Lighting
Control Module responds by applying pulse width
modulated (PWM) voltage to both DRL control circuits,
illuminating the DRLs. During low light conditions the
Lighting Control Module will command the low beam
headlamps ON.
Hazard Lamps
The hazard flashers may be activated in any power
mode. The Hazard Warning Switch signal circuit is
momentarily grounded when the hazard switch is
pressed. The K9 Body Control Module (BCM) respond s
to the hazard switch signal input by sending a serial
data message to the K219 Lighting Control Module.
The Lighting Control Module responds by supplying
battery voltage to all turn signal lamps in an ON and
OFF duty cycle. When the hazard switch is activated,
the BCM also sends a serial data message to the
instrument cluster requesting both turn signal indicators
to be cycled ON and OFF.
Park, Tail, and License Lamps
When the S30 Headlamp Switch is placed in the HEAD
or PARK position, ground is applied to the park lamp
switch ON signal circuit to the K9 Body Control Module
(BCM). The BCM responds to the park lamp switch
signal input by sending a serial data message to the
K219 Lighting Control Module. The Lighting Control
Module responds by applying battery voltage to the
park lamps, tail lamps, and license lamps control
circuits illuminating the park, tail, and license lamps.
Stop Lamps
The B22 Brake Pedal Position Sensor is used to sense
the action of the driver application of the brake pedal.
The K9 Body Control Module (BCM) provides the brake
pedal position sensor with low reference, signal, and
5 volt reference circuits. When the variable signal
reaches a voltage threshold indicating the brakes have
been applied, the BCM will respond by sending a serial
data message to the K219 Lighting Control Module
requesting the stop lamps to be turned ON. The
Lighting Control Module responds by applying battery
voltage to the left and right stop lamp control circuits as
well as the center high mounted stop lamp control
circuit illuminating the left and right stop lamps and the
center high mounted stop lamp. If serial data
communication is lost between the BCM and the
Lighting Control Module, the Lighting Control Module
will receive a serial data message from the Electronic
Brake Control Module indicating that the brakes have
been applied. If serial data communi cation is lost
between all three modules, the Lighting Control Module
also receives a hard wired voltage signal from the BCM
to signal the brake lamps ON.
2022 - Silverado 1500 (New) Electrical Body Builder Manual
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