Passport LX 2WD V6-3.2L DOHC (6VD1) (1998)
Relay Box: Description and Operation
Battery and load location may require that a switch be placed some distance from either component. This means a longer wire and a higher voltage drop
(1).
The installation of a relay between the battery and the load reduces the voltage drop (2).
Because the switch controls the relay, amperage through the switch can be reduced.