Patent ID: 8760052

Claim:
An indicator lamp lighting circuit for a vehicle, comprising: a first switching transistor which is provided on a feed path from an ignition power supply to an indicator lamp to supply power during an on-state of an ignition switch of a vehicle, and in which electrical conduction is established between an emitter and a collector thereof when a bias is applied to a base thereof pulled up by the ignition power supply during the on-state of the ignition switch; a second switching transistor which is provided between the base of the first switching transistor and ground, and in which electrical conduction is established between an emitter and a collector thereof when a bias is applied to a base thereof pulled up by the ignition power supply during the on-state of the ignition switch; and a signal line for a control signal connected to the base of the second switching transistor, wherein the control signal is used to apply a bias potential to the base of the second switching transistor during occurrence of a state to be informed by lighting of the indicator lamp, and is used to apply a non-bias potential to the base of the second switching transistor during non-occurrence of the state, and a connection point of the first switching transistor and the indicator lamp is selectively connected to a continuous power supply of the vehicle.