Montana AWD V6-3.4L VIN E (2004)
Parking Lamp: Description and Operation
Automatic Headlamps and Parklamps
AUTOMATIC HEADLAMPS AND PARKLAMPS
The automatic headlamps and parklamps are designed to automatically illuminate when the ignition is RUN and the outside (ambient) light level is low,
as in nighttime conditions. Light levels are detected by the ambient light sensor, a light sensitive transistor that varies its voltage signal to the daytime
running lamp (DRL) control module in response to changes to the ambient light level. When the DRL control module receives a low light signal from the
ambient light sensor, it will then turn on the headlamps and parklamps. The daytime running lamps will not operate when the automatic headlamps and
parklamps are on.
When the ambient light sensor detects low light levels, the DRL control module turns OFF the daytime running lamps and turns on the headlamps and
parklamps under the following conditions:
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The ignition switch is in the RUN position.
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The headlamp switch is OFF.
-
The park brake is OFF (released).
If the engine stalls with the DRL control module in the low light mode, the DRL control module turns OFF the headlamps while the engine is being
cranked. The parklamps will remain ON while the engine is being cranked.
