Blazer 2WD V6-4.3L VIN X (2004)
Tail Lamp: Description and Operation
PARK, TAIL, MARKER AND LICENSE LAMPS
The park, tail, marker and license lamps are turned on when the headlamp switch is placed in the PARK or ON position or anytime the headlights are
requested. The PARK LP fuse in the engine wiring harness junction block supplies battery positive voltage to the park lamp relay coil and the headlamp
switch. The body control module (BCM) provides a ground, or control circuit, to the park lamp relay coil circuit during ALC operation. When the park
lamps are turned on during ALC, the BCM energizes the park lamp relay. The park lamps can also be supplied battery positive voltage directly from the
headlamp switch. Current flow is to the FR PARK fuse, LR PARK fuse, RR PARK fuse and the TRL PARK fuse, and to their respective park, marker
and license lamps.
The front park and marker lamps are grounded at G111 and G112. The rear park, tail, marker and license lamps are grounded at G475 and G422 on the
pickup and G450 and G402 on the utility. If the headlight switch is left in the ON position, the park, tail and marker lamps will remain on until turned off
or the battery runs dead.
The front side marker lamps on the export vehicle stay on steady and do not flash alternately with the turn signals as the domestic vehicle does due to
they are grounded directly to G111 and G112.
