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The Select and Reset switches select, set, and reset the clock, the alarm clock, and the
trip odometers. Their inputs are connected to the SMC by a 4-pin connector on the
rear of the speedometer housing.
If these inputs are not connected, the SMC will display odometer information and
warning messages only.
This input provides a ground from a switch in the PTO system to the SMC. It pre-
vents the SMC from accumulating miles when the PTO system is in use and the vehi-
cle is not moving.
This input to the back of the SMC is a positive voltage that comes from the 2-speed
axle actuator on the gearshift lever. When the 2-speed axle is engaged, this input
causes the SMC to reduce the road speed indication by a factor of 0.73 to 1.
The instrumentation has a built-in initialization routine and several diagnostic capa-
bilities that can indicate if the system is functioning properly or if a problem exists
with it or with the system inputs.
When the ignition is first turned on the instrumentation performs an initialization to
verify correct operation. The initialization is described in Figure 3-6.
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