Garmin G3X Touch Installation Manual page 5

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References to the GSU 25 throughout this manual apply equally to the GSU 25B except

where specifically noted.

The term LRU, as used throughout this manual is an abbreviation for Line Replaceable

Unit. LRU is used generically in aviation for a product (such as a GDU 37X or GTP 59)

that can be readily "swapped out" (usually as a single component) for troubleshooting/

All GMU 22 information in this Installation Manual also applies to the GMU 44. The

GMU 44 had previously been used as the G3X magnetometer but has been replaced by the

Connector references JXXX(X) and PXXX(X) are used throughout this document. The

letter "J" or "P" designates the connector (whether on the LRU or wiring harness). "J"

(Jack) refers to the connector on the LRU, and "P" (Plug) refers to the connector on the

wiring harness. "J" or "P" designate the connector only, regardless of contact type (pin

or socket). However GDU 4XX connectors on the LRU are designated as P4X0X.

The GDU 37X/4XX products contain a lithium battery that must be recycled or disposed

by professional services according to applicable governing laws. Only Garmin-authorized

service facilities are permitted to perform maintenance on this product.

The Bluetooth® word mark and logos are registered trademarks owned by Bluetooth SIG,

Inc. and any use of such marks by Garmin is under license.

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G3X/G3X Touch Installation Manual

Troubleshooting