Marker Lamp: Description and Operation

PARK, TAIL, LICENSE, AND MARKER LAMPS

The park, tail, marker lamps, and license lamps, are - turned on when the headlamp switch is placed in the PARK or HEAD position or anytime the headlights are requested. The exterior lights power control feature prevents the park lights from remaining on if inadvertently left on. If the park lights are turned on after the ignition switch has been turned OFF, or is in the ACCY position, they will remain on until turned off or the battery runs dead.

The BCM supplies voltage to the park lamp relay coil via the exterior lamps power circuit. The park lamps are operated by the headlamp switch or twilight sentinel feature. When the headlamp switch is in the PARK position it sends a ground signal to the BCM. The BCM receives the ground signal from the headlamp switch and then sends a ground signal to the relay coil of the park lamp relay K130 energizing the relay. The headlamp switch also sends a redundant ground signal to the park lamp relay K130.

Fused battery voltage is supplied at all times to park lamp relay internal switch contacts. When the park lamp relay K130 is energized the internal switch closes. The park lamp relay supplies battery voltage is to fuses #23, #26 and #30. Fuse #23 supplies battery voltage to the LH park lamp and the LH outside tail lamp. Fuse #30 supplies battery voltage to the RH park lamp and the RH outside tail lamp. Fuse #26 supplies battery voltage to the LH and RH front - side marker lamps; the LH and RH rear license lamp and the LH and RH inside tail lamps.

The LH and RH park/turn signal lamps are permanently grounded to G103. The inside tail lamps, outside tail lamps, rear license lamps are permanently grounded to G400. The LH front side marker lamps are grounded in series parallel with the LH front [1][2]turn signal lamp and the RH rear turn signal lamps. The RH front side marker lamps are grounded in series parallel with the RH front turn signal lamp and the RH rear turn signal lamp.

All of the exterior lamps (including the front side marker lamps) will illuminate when the park lamp relay is energized. Because, the front side marker lamps are wired in series with the turn signal lamps they will not illuminate when battery voltage is applied to the turn signal lamps (during turn signal operation). When the turn signals flash the front marker lamps will not illuminate and then resume illumination when the turn is not operating.