Backup Lights Circuit

When the ignition switch is in the RUN or the START position, voltage is available at the backup lamp switch from TURN B/U fuse 16 through circuit 16 (PNK). The backup lamp switch is part of the park/neutral position switch. When you place the transmission in REVERSE, the backup lamp switch contacts close. This applies voltage through circuit 24 (LT GRN) to the backup lamp. Voltage is also available to the trailer wiring provision connector. The backup lamp grounds through circuit 250 (BLK) to ground G401. When voltage applies with the transmission in REVERSE, the lamp illuminates. Shifting to another gear or stopping the engine causes the lamp to turn off.