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Reset your TomTom GPS receiver. Some TomTom users report occasional difficulty in getting their TomTom navigation device to start or respond to commands. If this happens to you, remedy the problem by performing a soft reset on your TomTom GPS. A soft reset will reset the data on your TomTom GPS receiver without erasing any data. To reset a TomTom GPS receiver, press and hold the "On/Off" button for 15 seconds or until the device restarts. 2
Let your TomTom GPS acquire the necessary satellite signals outside. If the device has trouble connecting to the satellite signals necessary for its operation, try an easy fix to the problem. Take your TomTom GPS receiver outside, away from mountains, tall buildings or heavy foliage, where the receiver has a clear view of the sky. Wait for a few moments while the device acquires the necessary satellite signals.
Read more: How to Troubleshoot a Tom Tom GPS ' eHow.com http://www.ehow.com/how_5533906_troubleshoot-tom-tom-gps.html#ixzz1hV4FBQ91
"GPS Module Not Responding" is the display units way of telling you there is basically no GPS module connected. You didn't say which unit you have, so I am assuming this is something like an LMS-520? The GPS module is the LGC-3000? If this is the module you have, make sure that you have powered the NMEA 2000 network. The display unit's power cable has a set of red, black, and sheild wires that need to be hooked up to a 12VDC power source. There is a power diagram somewhere in the manual that should show this.
Make sure that you have the NMEA 2000 network connected properly. If it is a newer version, it should just be a single 15ft cable that has two female ends, the module plugs into one end, and the other end plugs into the back of the display. If it came with some T connecters and 120Ohm Terminator caps, then make sure you have that hooked up correctly. There should be a diagram in the manual for that as well but you just connect the two T's together like TT, put the 120Ohm terminators at each end, and run the extensions to the display and GPS module.
There is a decent troubleshootin guide for checking to make sure power is getting to the module at http://primus.lowrance.com/support/resultDisplay.do?gotoLink=92&docType=1000&contextId=426%3A92.273%2C600.639%2C92.113&clusterName=ClusterPublic&lang=english&docset=%2FDocuments%2FTroubleShooting%2FNew+Utility&contentId=42296cce-4f9b-40c8-9dcf-33d5df754009&responseId=135ccbe2cfd4f608%3A1fe88d%3A1225c5cc17c%3A-bac&groupId=4&answerGroup=1&score=986&page=http%3A%2F%2Fprimus.lowrance.com%2Ficr%2FTroubleShooting%2FNew+Utility%2FNU_GPS_ModNR.htm&result=0&excerpt=Module+Not+Responding+The+GPS+module+not+responding+(early+GPS+products+may+also+indicate+coupler+not+responding)+indicates+that+the+unit+and+module+are+no+longer+communicating.&question=gps+module+not+responding&resultType=5000#Goto92
If this doesn't tell you anything, most likely the GPS module is bad.
I just went through this with Lowrance. tthe LGC 2000 module on my LCX 20 depth finder "quit responding" out of the clear blue. You have to go Lowrance.com and they have some tests you can follow to see if it is a bad cable or the module itself. I had to replace the module. They charged $99 bucks plus $12.50 shipping for a new one. I bought it spring of 2008, and the unit was 3 months out of warranty when it quit working. Last season I had lower back fusion and didn't use it except for 2 times late in the season. Getting ahold of Lowrance is going to be an experience. I called twice and waited on hold over 35 minutes before I was suddenly cut off both times. I tried email too, but it took 3-5 days to receive a response. Mine broke down June 18 of this year. I started trying to get hold of Lowrance the next day. By the time all the back and forth emails with the delayed responses were done, I received my new unit on July 24. 5 weeks! with out my gps in MN. It is a short season up here as it is. I sure didn't enjoy waiting that long.
Do the following:1 - Make sure you have fresh batteries in the unit and turn the unit on.2 - Check the GPS date and Time. On the Main Menu at the bottom of the screen, you can see a date and time. If the date and time are not current, then the clock is your problem. You will have to wait for the almanac information to be updated. Details are below in a later section.3 - Make sure your GPS is in the Normal Mode and not a demo mode. Verify other systems settings.
Go to the main menu and click on Setup icon.
From the Setup screen, access the System screen icon.Verify the following settings: GPS: normalWAAS: EnabledLanguage: English or your choice.Battery: Set according to your battery types.4 - Check your GPSs Version Software.
Go to the main menu and click on Setup icon.
From the Setup screen, access the System screen icon.
From the System screen, access the sub-menu icon in the upper right bar.
Select "Software Version" from the list. Verify the actual software version for me.The latest version available for the eTrex Legend is version 3.90 dated March 2008.http://www8.garmin.com/support/download_details.jsp?id=711Update the unit using this latest software and using Garmin's Webupdater.http://www8.garmin.com/products/webupdater/howtoinstall.jspIf that won't work, use the following download page to access the latest software updates per units.http://www8.garmin.com/support/blosp.jsp5 - Resetting your GPS clock and almanac informationNext you may need to acclimate your unit to a new date and time (almanac information). If you had your unit off and without batteries for over a month since you last accessed satellites, then your clock and almanac information may be incorrect. Even Garmin acknowledges this problem after software updates and the problem with accessing satellites. They state: "unit data including alamanac information may be incorrect or cleared. Back up all user data before upgrading. After installation is complete, place unit with a clear view of the sky for 15-30 minutes to re-acquire almanac data. "I know of no way to reset the clock using the GPS menus. All I can suggest is that you do the following:A - turn the unit on and wait 5 minutes or so for the "Poor Satellite Reception" screen to appear. See page 7 of the owner's manual.B - Set the "new location" to your area using the map when the "poor satellite reception screen" appears. Be sure to use the "map" option and not the "automatic". C - Set the GPS outside with a clear view of the sky. Check on it every 10 minutes. When the "Poor Satellite Reception" screen appears again, then click on "Restart Search". The "Restart Search" option is used when the date provided in the GPS is not today's date. (See page 7 of the Owner's manual for an example)Legend Owners Manual: http://www8.garmin.com/manuals/eTrexLegend_OwnersManual.pdfD - Once the GPS can track 4 satellites, then the clock should reset and you should be fine. This process could take up to an hour. I have had this problem with my eTrex Vista and eTrex Legend (both backup GPSs) and resolved it by having the clock reset. In fact, I just tried my eTrex Legend today after not using it for many months and storing it without batteries and it had this same problem. I followed the steps above to fix the problem. This took about 35 minutes.