Backup Lamp: Description and Operation

CIRCUIT OPERATION
Operation of the back-up lamps is controlled by a switch located internal to the Transmission Range Sensor (TRS).

Power for the back-up lamp switch is supplied on circuit F20 which is protected by a 15 Amp fuse located in cavity 4 of the junction block. This fuse is HOT in the RUN position only.

Power for the fuse is supplied by circuit A22. This circuit connects from the ignition switch to the junction block. Power for the A22 circuit is supplied by circuit A2. This circuit originates in the Power Distribution Center and is protected by a 40 Amp fuse located in cavity 18.

When the operator places the vehicle in REVERSE circuits F20 and L1 are connected. Circuit L1 connects from the TRS to the back-up lamps.

Ground for the lamps is supplied on circuit Z1.