lamps based on ambient light levels. Ambient light
levels are monitored by the BCM using the automatic
temperature control system Sun load Sensor, located
on the top of the instrument panel cover. Ambient
light readings are averaged to limit cycling the lamps
ON and OFF when passing through areas with vary-
ing light levels. The automatic headlamps will only
function when the engine is running. When the head-
lamp switch is in the AUTO position (Automatic
mode), the Headlamp Time Delay system will func-
tion when the ignition is switched OFF.
COURTESY LAMPS
DESCRIPTION
The Body Control Module (BCM) illuminates the
courtesy lamps whenever a door is opened. When the
last door is closed, the BCM “fades-to-OFF” the cour-
tesy lamps in five seconds. If a door is left ajar, the
courtesy lamps remain on for a maximum of one
hour when ignition switch is OFF. After one hour, the
BCM “fades-to-OFF” the courtesy lamps.
DAYTIME RUNNING LAMPS – CANADA ONLY
DESCRIPTION
The daytime running lamps are controlled by the
Daytime Running Lamp Module (DRL Module). The
DRL module is attach to the Junction Block. The
Junction Block is located on the left side of the
instrument panel. The DRL allows the high beam
headlamps to illuminate at reduced power when the
ignition switch is in the run position with the high
and low beam headlamp switches in the OFF posi-
tion. The Park Brake must be released and the
Brake Fluid Level switch must be in the open posi-
tion to allow the headlamps to operate in DRL mode.
The daytime running lamps will go out when the
headlamp switch is turned ON. The passing light fea-
ture will flash bright high beams while the daytime
running lamps are activated.
HEADLAMPS ON WITH WINDSHIELD WIPERS
DESCRIPTION
For vehicles equipped with the Automatic Head-
lamp System, the instrumentation and exterior illu-
mination lamps will be turned ON when the
headlamp switch is in the AUTO position and the
windshield wipers have been in the intermittent, low
or high mode of operation for more than ten seconds.
When the windshield wipers are turned OFF the
Body Control Module will determine if the instru-
mentation and exterior illumination lamps should
remain ON base upon the current ambient light
level.
HEADLAMP SYSTEM
DESCRIPTION
The headlamp system is controlled completely by
the Body Control Module (BCM). The BCM controls
the Park lamps, Headlamps, and Front Fog Lamps
using relays located in the Junction Block. Three
wires are connected between the headlamp switch
and the BCM. The first wire contains information
regarding the position of the headlamp switch (Off,
Automatic Headlamps, Automatic Headlamp switch
fog, Park with Fog, Head, or Head with Fog Lamps).
The second wire contains information regarding the
position of the dimmer switch (Dome Lamp, Daytime
Brightness, or Dimming Level). The third wire is a
dedicated signal return (ground) wire.
OPERATION
The headlamp system will default to headlamps
ON position when ignition switch is ON when an
open or short circuit failure occurs on the headlamp
switch input. The system will return to normal oper-
ation when the open or short is repaired. A fault will
be reported by the BCM when a failure occurs on the
dimmer or headlamp switch input.
The dimmer system will default to Daytime Bright-
ness when an open or a short occurs on the dimmer
switch input.
The BCM will turn OFF the exterior lamps if they
are left ON with the ignition switch OFF for more
than ten minutes. This feature prevents the vehicle
battery from being discharged when the vehicle
lights have been left ON.
HEADLAMP TIME DELAY SYSTEM
DESCRIPTION
The Headlamp Time Delay system is controlled by
the Body Control Module (BCM) through the head-
lamp relay.
OPERATION
The headlamp time delay system is activated by
turning the headlamps ON (high or low beam) while
the engine is running, turning the ignition switch
OFF, and then turning the headlamp switch OFF
within 45 seconds. The system will not activate if
more than 45 seconds elapse between ignition switch
OFF and headlamp switch OFF. The BCM will allow
the headlamps to remain ON for 90 seconds before
they automatically turn off. Refer to the Owner’s
Manual for more information.
8L - 2 LAMPS LH
DESCRIPTION AND OPERATION (Continued)
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