Inside Rearview Mirror Courtesy Lamps

Inside rearview mirror courtesy lamp operation is controlled through the CTSY LP MicroRelay #42 by the Body Control Module (BCM). Battery voltage is supplied to the relay coil and switch by circuit 1240 through the C/LADL Mini Fuse(R) #29. When the BCM receives a courtesy lamp on request the CTSY LP MicroRelay #42 control circuit 690 is grounded through the BCM energizing the relay coil. When the relay coil is energized the relay switch is drawn closed and battery voltage is supplied to the reading lamps switches through the courtesylamp feed circuit 740. The courtesy lamp and the reading lamp functions use the same light bulbs therefore courtesy lamp operation may occur only when the reading lamp switches are turned off. The inside rearview mirror lamps are grounded through circuit 150 to the splice pack ground 202.