Garmin G1000 Maintenance Manual page 135

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SPARE INPUT―A green box indicates Pin 14 is grounded. This input should have a black
c.
box, if it is green check for connector miswiring or a bent pin.
TEST/DEMO MODE SLCT―A green box indicates Pin 53/54 is grounded. These inputs
d.
should have a black box, if either box is green check for connector miswiring or a bent pin.
PULSE PER SEC 1, 2―Displays status of GPS time synchronization inputs (from GIA) to
e.
the GDU. Used for Garmin testing, not useful for troubleshooting.
G1000 System Maintenance Manual
190-00903-00
Page 5-89
Rev. A