A vehicular lamp apparatus includes: a lamp unit; a controller that controls the lamp unit based on vehicle information received from a vehicle; and an acceleration sensor that provides information indicating vehicle acceleration to the controller. The controller detects whether or not reception of the vehicle information is interrupted and controls the lamp unit based on the vehicle acceleration when interruption in the reception of the vehicle information is detected.

A lighting system includes at least two indicating lights each supporting primary and secondary lighting functions. The at least two indicating lights are selected from a group consisting of a turn signal light, a brake light, and a reverse light. A diagnostic module determines when a first one of the at least two indicating lights is not operating. A lighting control module is configured to control a second one of the at least two indicating lights to support the primary lighting function when the first one of the at least two indicating lights is operating and the primary lighting function is commanded and to adjust operation of the second one of the at least two indicating lights to support the secondary lighting function corresponding to the first one of the at least two indicating lights when the first one of the at least two indicating lights is not operating.

A vehicular lamp system includes: a lamp unit comprising a plurality of marker lamp regions, each operable as a different marker lamp, the plurality of marker lamp regions being customizable in arrangement; a configurator that receives a customization of the plurality of marker lamp regions in arrangement and that generates a customized configuration indicating customized arrangement of the plurality of marker lamp regions; and a controller that controls the lamp unit to define the plurality of marker lamp regions in the lamp unit according to the customized configuration and to operate the plurality of marker lamp regions each as the different marker lamp. The configurator displays a settable area that is allowed to be used as a marker lamp region for each marker lamp when receiving the customization.