Turn Signal Lamps
Ground is applied at all times to the turn signal/multi-function switch. The turn signal lamps may only be activated with the ignition switch
in the ON or START position. When the turn signal/multi-function switch is placed in either the TURN RIGHT or TURN LEFT position, ground
is applied to the BCM through either the right turn or left turn signal switch signal circuit. The BCM then applies a pulsating voltage to the
front and rear turn signal lamps through their respective voltage supply circuits. When a turn signal request is received by the BCM, a
serial data message is sent to the instrument cluster requesting the respective turn signal indicator be pulsed ON and OFF.
Repeater Lamps
The repeater lamps are located in the front fender. The repeater lamps are used as additional turn signal lamps, and operate as described
in the Turn Signal/Hazard Flasher Lamps description.
Hazard Flasher Lamps
The hazard flashers may be activated in any power mode. The hazard switch is permanently grounded. When the hazard switch is placed in
the ON position, ground is applied through the hazard switch signal circuit to the BCM. The BCM supplies battery voltage to all turn signal
lamps in an ON and OFF duty cycle. When the hazard switch is activated, the BCM sends a serial data message to the instrument cluster
requesting both turn signal indicators to be cycled ON and OFF.
Stop Lamps
The brake pedal position (BPP) sensor is used to sense the action of the driver application of the brake pedal. The BPP sensor provides an
analog voltage signal that will increase as the brake pedal is applied. The BCM provides a low reference signal and a 5 V reference voltage
to the BPP sensor. When the variable signal reaches a voltage threshold indicating the brakes have been applied, the BCM will apply
battery voltage to the stop lamp control circuit and center high mounted stop lamp control circuit . When the control circuit is energized
the stop lamps are illuminated.
Backup Lamps
When the transmission is placed in the reverse position, the engine control module (ECM) sends a serial data message to the BCM. The
message indicates that the gear selector is in the reverse position. The BCM applies battery voltage to the backup lamps. The backup lamps
are permanently grounded. Once the driver moves the gear selector out of the reverse position, a message is sent by the ECM via serial
data requesting the BCM to remove battery voltage from the backup lamp control circuit.
Battery Run Down Protection/Inadvertent Power
To provide battery run down protection, the exterior lamps will be deactivated automatically under certain conditions. The BCM monitors
the state of the headlamp switch. If the park or headlamp switch is ON when the ignition switch is placed in either the CRANK or RUN
position and then placed in the OFF position, the BCM initiates a 10 min timer. At the end of the 10 min, the BCM will turn off the control
power output to the park and headlamp relay coils, deactivating the exterior lamps. This feature will be cancelled if any power mode other
than OFF becomes active. The BCM will disable battery run down protection if any of the following conditions exist. The park or headlamp
switch is placed in the ON to OFF position, and back to the ON position during battery run down protection. The BCM determined that the
park or headlamp switch was not active when the ignition was turned OFF.
S e c tion 04
BODY SY
S T
E
M
S
Lighting
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CHEVROLET CRUZE BODY REPAIR MANUAL 2010
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