Light irradiation control system for vehicle lamp

A light irradiation control system for a vehicle lamp (RHL, LHL) includes a control unit configured to provide control signals for controlling light irradiation of the vehicle lamp (RHL, LHL) based on detection signals detected by sensors (Sh, Sv, So, Ss). Actuator units (5R, 5L, 6R, 6L) are configured to control the light irradiation of the vehicle lamp (RHL, LHL) based on the control signals. The control unit includes a body-side control unit (1, 2, 3, 4) and a lamp-side control unit (7, 8). The body-side control unit (1, 2, 3, 4) is configured to perform signal processing on the detection signals and to provide the signal-processed signals to a common bus (BUS) as common data (Dh, Dv, Do, Ds). The lamp-side control unit (7, 8), which is mounted in at least some of the actuator units (5R, 5L, 6R, 6L), is connected to the common bus (BUS) to provide the control signals based on the common data (Dh, Dv, Do, Ds) provided to the common bus (BUS).