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Hi Diane, from the symbol you described it sounds like you are not receiving the satellite signal to your sat nav! The weak satellite signal could be due to the location you are in and also within the vehicle, some vehicles reduce satellite signals and you have to fix an external aerial to improve the signal! Have you tried using it with the door/ window open to see if that helps the signal?
No. If you have a power retractable antenna, the motor is on the radio fuse circuit. There are two causes for antenna failure I have seen - one is breakage of the plastic push-pull strip inside the antenna; the other is excess friction between the sections of the antenna, often caused by a film of dirt built up on the surface of the sections. In the latter case, you may hear the motor clutch thump several times when you turn off the radio. If your problem is reception failure, check the connections at each end of the cable between the antenna and radio. Inspect the cable wherever it may have been exposed to damage from a heavy or sharp object transported in the vehicle (even it is covered by a carpet)..If the cable is flattened or kinked at some point, that is your problem. The best fix in that case is to replace the cable, but it is probably easier, cheaper, and quite adequate to cut out the damaged section and rejoin the cable with coaxial connectors (a simple splice will have too much signal loss at radio frequencies and will not be reliable).
Did you replace the antennea with the EXACT same one,or did you get an aftermarket one ? Did you replace/reinstall the rubber/plasitic gasket that sit's under the base where the antennea mount's on the truck ? If you answered yes to ALL of these question's,then your problem lie's in the cable itself. Be sure that you have the CORRECT one (cable) because where the cable connect's to the antennea there can be no play (looseness) or you WON'T get the proper signal.
The circuit boards in Chevrolet tail lamps ar notorious for going bad. Dorman makes a replacement circuit board, part number 70006 . the same part number will fit either the left or right side of your Trailblazer.
The Trailblazers have a common problem with the printed circuit boards in the tail lamp housing.
Unplug the tail lamp housing at the wiring connector and test for power with a test light. ( With turn signals on) You may have an open circuit in the lamp housing circuit board. Good luck
try checking the brake light switch attached to the brake pedal,very common problem. has about 5 contacts in it ,they all operate different things. If you have a scan tool with live data readings you can watch them all. also check fuses and bulbs ,but you say the signals work so that seems ok.