Spicer TPCS Troubleshooting Guide: Older Systems (ECU's w_Dual Connectors) - Manual (Page 12)

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Configuration Indicators
The tractor / trailer outline show(s) whether the vehicle is configured with
a two channel (tractor or straight truck) or three channel (tractor and
trailer) Tire Pressure Control System.
Logomark
Indicates power on at vehicle start­up.
Channel Indicators
The rings inside the tires of the configuration indicators show with
channel (steers, drives or trailers) is being reported by the digital display.
Operator Instructions
Select Key
This key allows the operator to continuously monitor one channel, or
scan all of them. On power­up, the Operator Control Panel will not
display any pressures (“Quiet Mode”). Pressing the select key once will
cause the display to scan the tire pressures (see Channel Indicators).
Repeated pressing will lock the display on each individual channel (so
that any channel may be monitored continuously) and then return to the
no display condition.
Note: All symbols on the display will light momentarily upon start of the
vehicle.