Garmin G3X Installation Manual page 781

34.2.1.5 GDU 37X Replaced with New GDU 4XX
NOTE
A G3X system installation can use either GDU 37X or GDU 45X/46X displays, but a G3X
system installation cannot use both GDU 37X and GDU 45X/46X displays simultaneously.
Data written to the config module by a GDU 37X display cannot be read by a GDU 4XX. Before
upgrading an existing G3X system to GDU 4XX displays, take careful written note of all configuration
settings, and back up fuel quantity calibration data to an SD card as described in
The main display connector is pin-compatible between the GDU 37X and GDU 4XX. The GDU 4XX
supports additional RS-232 ports, which may be used when replacing two 7" GDU 37X displays with a
single 10.6" GDU 46X. For redundancy of ADAHRS data, a GDU 4XX may also optionally be connected
to the GSU 25 using the dedicated RS-232 port provided for this purpose (see
After removing GDU 37X displays and installing GDU 4XX displays, including making any necessary
interface wiring changes, erase the config module using the following steps:
1. Power on the system in config mode (see
2. Access the System Information config page (see
3. In the list of devices, select the PFD.
4. Press the MENU key and select "Format Config Module".
5. When prompted, confirm erasing the config module.
6. The PFD will reboot when finished. Re-enter config mode to complete GDU 4XX setup.
Re-enter configuration settings as described in
data from the SD card by using the instructions in
34.2.2 GSU 73
NOTE
A pitot/static check as outlined in 91.411 and Part 43 Appendix E must be completed if the
pitot/static lines are broken.
34.2.2.1 Original GSU 73 is Reinstalled
No software or configuration loading is required if the original GSU 73 is reinstalled in its original
mounting location. Continue to
34.2.2.2 New GSU 73 Installed
If a new GSU 73 is installed (new serial number), verify the correct software version on the MAIN page in
configuration mode. The correct GSU 73 software version will automatically be loaded from the GDU. If
the configuration module is operational, no software configuration is required. Continue to Section 34.2.4.
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Rev. AA
Section
Section 32.4, including restoring fuel quantity calibration
Section
Section 34.2.4.
G3X/G3X Touch Installation Manual - Maintenance
Section
Section
32.2).
Section 32.4.3).
32.4.25.3.
31.4.18.4.
23.4.1).
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