Backup Lamp Switch: Description and Operation

On automatic transmissions, the back-up lamp switch is part of the [1][2]PARK/NEUTRAL position switch. The back-up lamp switch does not connect to the Powertrain control Module (PCM) on manual transaxle equipped vehicles.

When the operator puts the vehicle in reverse, the back-up lamp switch connects circuits F20 and L1. Circuit F20 is connected to a bus bar in fuse block, and cavity 3 of the [1][2]PARK/NEUTRAL position switch. Circuit A22 feeds the bus bar.

Circuit L1 feeds the back-up lamp and double crimps to provide an input to the PCM on cavity 55 Circuit L1 connects to cavity 1 of the [1][2]PARK/NEUTRAL position switch.