Service Manual

Groundsmaster 4500−D/4700−DPage 5 − 48Electrical System

CAN−bus Termination Resistor

System communication between electrical components

on Groundsmaster 4500−D and 4700−D machines is

accomplished on a CAN−bus communication system.

Two (2) specially designed, twisted cables form the bus

for the network used on the machine. These wires pro-

vide the data pathways between machine components.

At the end of the twisted pair of bus cables near the In-

foCenter display is a 120 ohm termination resistor.

The CAN−bus termination resistor plugs into the plat-

form wire harness in the control arm. The resistor can be

accessed by removing the cover plate on the right side

of the control arm. The wire harness connector has a

blue insert to identify the proper location for the termina-

tion resistor.

NOTE: The Groundsmaster 4500−D and 4700−D en-

gine ECU includes the second CAN−bus system termin-

ation resistor. This resistor cannot be accessed for

testing.

NOTE: Refer to the Electrical Schematics and Wire

Harness Drawings in Chapter 9 − Foldout Drawings for

additional information on termination resistor location

and wire connections.

IMPORTANT: The termination resistor is required

for proper electrical system operation.

Termination Resistor Test

The termination resistor (Fig. 59) can be tested using a

digital multimeter (ohms setting). There should be 120

ohms resistance between terminals A and B of the ter-

mination resistor. There is not a terminal in cavity C on

Groundsmaster 4500−D and 4700−D machines.

Figure 59

Termination

Resistor