Parking Lamp: Description and Operation

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:
- The ignition switch is in the RUN position.
- 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.

PARK, SIDEMARKER, TAIL, AND LICENSE LAMPS
The park lamp, sidemarker lamps, tail lamps, and license lamps, are turned on when the headlamp switch is placed in either the PARK or HEAD position, or anytime the headlights are requested. With the headlamp switch placed in the OFF position, and the Daytime Running Lamps (DRL) ambient light sensor indicating low light conditions, the Daytime Running Lamps (DRL) control module will operate the park lamp, sidemarker lamps, tail lamps, and license lamps. The PARK fuse supplies battery voltage to the headlamp switch and DRL control module. Current flow is from the headlamp switch or the DRL control module to the park lamp, sidemarker lamps, tail lamps, and license lamps. The LF park lamp is grounded at G101 and the RF park lamp is grounded at G102. The side marker lamps are grounded through the corresponding rear turn signal lamps when the rear turn signal lamps are inactive. The remaining lamps are grounded a G401.