Darkmistress,
Did you try all the troubleshooting tips recommended by Lowrance?
Module Not Responding LGC-3000/LGC-2000 / LGC-Baja
These GPS modules are designed to operate with NMEA 2000 compatible systems. These require a power supply to operate. This is either supplied directly to the network or through an extra cable (NMEA 2000 Power) on the unit power cable. This is often overlooked.
Ensure proper power is supplied to the unit for operation. Follow trouble shooting for blue connector unit power related issues here or red connector unit power related issues here if needed. Ensure proper power is being provided to the GPS module. If not configured for a network, power should also be applied to the NMEA 2000 Power cable. Apply the red wire to a fused (3A) +12V supply. Ground both the black wire and the shielded ground (bare wire). To determine if an interruption in power is preventing the GPS operation, review this document. Check and clean connections between the display portion of the unit and the GPS module. A minimum of two connections will be in the cabling and possibly more. Trace the cable and clean contacts at each connector as needed. Clean all connections with an anti-corrosion clean for electronics as needed. Ensure that a Liner Architecture is observed if using a LowranceNET or NMEA 2000 network. Check the terminating resistor(s). There may be one 60 Ohm terminator or two 120 Ohm terminators. Simply check the short end of the Y cable. If a hard plastic "T" is in use, check the end for the terminator. Any evidence of scorch or fowling may indicate a replacement terminator or cable should be obtained. Isolate the RS-232 communications (NMEA-0183) cable. This will have 4 wires, yellow/Orange/Blue/Shield. Tape each wire individually and then together if not using the NMEA communications. Update the unit and the GPS module to their latest software version. If an earlier version of software for a module is operated with an newer version of the unit, communications may not function properly. Update the unit and GPS module accordingly by following this link. Reset the unit. Resets for your particular unit are available HERE. After updating, check the NMEA 2000 Bus. Press menu from a main operating page and select the NMEA 2000 menu and choose the Bus Setup option. If other devices on the network are visible, check the connection at the GPS module to the network as well as other cabling between the module and other properly operating devices. If the LGC-2000 is visible, select this option to view data for software version, and additional data. The status may indicate not-configured or OK. If not configured, change the instance to 255. Reset the network by removing power from the NMEA 2000 power cable. Keep power off for a couple minutes to allow all devices to properly reset. Reapply power to the network.
If problems persist, it is difficult to determine the actual fault due to the cables, terminators and other devices in use. Attempting operation on another available system to isolate the communication error is ideal if possible.
Note: The LCG-3000 is now obsolete. It has been replaced by the LCG-4000. Does look like there is software for the GPS module, only the LMS-520C display. I would think the 520 upgrade would have all available connecting components such as transducers and GPS units as part of the software upgrade.
BATMAN
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