Volvo VNL Service Manual page 18

Group 30 Electrical System—VNL, VNM
Switches and relays
Circuit controls are switches or relays. Switches are
usually at the beginning of a circuit but can be used to
control a ground path. For example, the switch controlling
the headlights is at the power end of the circuit, while the
door switch controlling the dome light completes the circuit
to ground. Relays are remotely controlled switches. They
use a low current signal through a coil to control larger
currents conducted through their contacts.
A new feature used in the VN Series vehicle is the
micro-relay. The micro-relay is smaller in size than a
conventional relay, and the pin arrangement is different
(see illustration).
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Relay Pin Arrangement and Schematic
Micro-relay Pin Arrangement and Schematic
Note:
Relays are shown from insertion-side view.
Design and Function
W3000777
W3000778