Digital BUS-WATCH
®
SD40
Page 23 of 72
Radio Engineering Industries, Inc.
640434 -- Rev 0 -- 9/30/2011
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Front door switch operation
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Back door switch operation
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Optional point with Auxiliary (Aux 1 is user-defined and may be used to
monitor points such as wheelchair lifts, inertia sensors, etc.)
The CUSTOM vehicle sensor option allows for most other situations. The letters
that appear on the screen are settable through the menu system. The default settings
are blank.
When using these options, the DEFAULT condition is that the Digital BUS-
WATCH® considers a low voltage (or ground) in the OFF state. A high voltage (5-
15 VDC) is interpreted as the ON state. To switch the polarity of these signals,
reference the Vehicle Sensor Levels Options menu page as shown in Figure 59 on
Page 70.
Speedometer Harness Wiring Instructions
The BUS-WATCH® speedometer input wires are designed to be spliced directly
onto the transmission speedometer transducer wires. In some installations, this may not
be possible (i.e. mechanical speedometer, transmission manufacturer warnings, etc.). The
BUS-WATCH® Vehicle Speed Sensor Kit (P/N 750086) may be required.
Vehicle Sensor Options Harness Vehicle Connections
(Shown as School Bus)
WIRE COLOR
WIRE DESCRIPTION
BLACK
RED WARNING LAMP
BROWN
YELLOW WARNING LAMP
RED
LEFT TURN SIGNAL
ORANGE
RIGHT TURN SIGNAL
YELLOW
STOP ARM
GREEN
BRAKES
BLUE
FRONT DOOR
VIOLET
REAR DOOR
Refer to the vehicle service manual for speedometer type, exact wire
location, and transmission manufacturer warnings.
