Service Manual

627333-A 6-9
Electrical Sysem
PRIMARY CAN BUS COMPONENTS
FIG. 3: Master Module
Master Module is located behind the right rear curved
panel on outside of the cabin. To access panel loosen
hand nut located in center of curved panel. Master
module accepts signals from switches and other
modules in cab, translates, and transfers those
commands via a two-wire shielded harness to I/O
(Input/Output) interface module. Master module also
accepts inputs back from I/O interface modules and
forwards those signals to proper component.
J1 Connector (1) - pins are inputs except where
designated.
J2 Connector (2) - pin is output except where
designated.
FIG. 3
Q000085S
Master Module
J1 J2
1B+ 1B+
2 Left-Hand Foam Marker Input 2 Radar Output
3 Right-Hand Foam Marker Input 3 Left-Hand Turn Signal Output
4 Master Apply 4 Right-Hand Turn Signal Output
5 - 5 Left-Hand Amber Flashing Warning Light Out
6 - 6 Right-Hand Amber Flashing Warning Light Out
7 - 7 Low Beams Output
8 - 8 High Beams Output
9 - 9 Work Lights 1 Output
10 - 10 Work Lights 2 Output
11 - 11 -
12 - 12 Work Lights 4 Output
13 - 13 Reverse Output
14 - 14 Service Brake Output
15 - 15 Park Brake Output
16 Work Light #6 16 Park Lights Output
17 - 17 -
18 - 18 -
19 Work Light #5 19 -
20 Work Light #7 20 -
21 Fog Light 21 Foam Marker On Output
22 Beacon 22 -
23 - 23 -
24 - 24 -
25 BCO Input 25 -
26 Left-Hand End Row Input 26 -
27 Section 1 Input 27 -