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Radio stopped working on low battery
2002 Jeep Grand Cherokee
My friend's Jeep has a low battery which ultimately needs to be replaced, it already left her stranded once. The battery puts out 9V only, it still cranks the car but barely. When the engine runs the voltage coming out of the alternator is about 12+ V so the alternator is fine. Anyhow, the radio stopped working when the battery was to low to crank the engine at all. This maybe just coincidental, however my question is if there is some security feature/code to activate the radio after a loss of power. I checked the fuse (no 30, blue 15amp) and it's fine. I would think it is unlikely that there is a short circuit somewhere in regards to the radio. So, any special way to activate the radio after loss of power? Its the standard factory radio and the manual is not talking about any special procedure. Thanks in advance. Axel |
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#2
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Radio stopped working on low battery
I do not know Jeep, specifically, on this function, but Toyota uses it
widely. The idea is that nobody likes to call AAA because the battery is dead, so they have discovered that a non-essential function (clock, radio, compass, etc.) can be designed so that when the battery voltage drops below a threshold that might cause the starter to falter, then that function goes away. If the radio forgets the stastion you left it on, the message is that the battery is dying. If the clock does not remember whate time it is, the battery is dying. If the radio refuses to work after the voltage is restored, then the Anti-Theft feature of the radio is doing it's job. The idea here is that when the radio is stolen, it requires a code to be input through the station selection buttons. (Typically there are 6 buttons, so the code might have 5 digits with any one of the six buttons being required for each digit. BMW uses this scheme, I do not know if your Jeep uses it or not. The radio thinks it has been stolen -- power went away then came back when the battery was replaced, this the same thing that happens when the radio has been stolen. The code that your radio needs is unique to your radio, if there is a code needed. Well, the code might not be unique, but it is not so common as to allow anybody to tell you what it is. The same code might repeat if there are enough radios, but there is no way that all radios use the same code. That defeats the purpose of the code. "axel" > wrote in message ... > 2002 Jeep Grand Cherokee > > My friend's Jeep has a low battery which ultimately needs to be > replaced, it already left her stranded once. The battery puts out 9V > only, it still cranks the car but barely. When the engine runs the > voltage coming out of the alternator is about 12+ V so the alternator > is fine. > Anyhow, the radio stopped working when the battery was to low to crank > the engine at all. This maybe just coincidental, however my question > is if there is some security feature/code to activate the radio after > a loss of power. I checked the fuse (no 30, blue 15amp) and it's > fine. I would think it is unlikely that there is a short circuit > somewhere in regards to the radio. > > So, any special way to activate the radio after loss of power? Its > the standard factory radio and the manual is not talking about any > special procedure. > > Thanks in advance. > Axel |
#3
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Radio stopped working on low battery
axel wrote:
> 2002 Jeep Grand Cherokee > > My friend's Jeep has a low battery which ultimately needs to be > replaced, it already left her stranded once. The battery puts out 9V > only, it still cranks the car but barely. When the engine runs the > voltage coming out of the alternator is about 12+ V so the alternator > is fine. When the battery is that low all sorts of things can happen. Even the Jeeps brain gets confused. Replace the battery before something is damaged, especially the alternator because it will be overworked. That and failing batteries can go bad in spectacular ways (think internal short). As for the radio, that depends. The WJ shipped with several radios, some of the higher end units did have an anti-theft. When the radio has power loss for a significant amount of time (think about an hour) the next time it powers you usually get "ENTER CODE" as the display. -- DougW |
#4
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Radio stopped working on low battery
I do not know about the grand, but I do know that the stereo in a
Cherokee can blow out from an 'open' circuit on the alternator or no battery in the circuit to buffer the load. The alternator can spike the voltage with a bad or no battery connection which lets the magic smoke out of the stereo. Mike 86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00 2000 Cherokee Sport 'New' frame and everything else in '09. Some Canadian Bush Trip and Build Photos: http://mikeromainjeeptrips.shutterfly.com axel wrote: > 2002 Jeep Grand Cherokee > > My friend's Jeep has a low battery which ultimately needs to be > replaced, it already left her stranded once. The battery puts out 9V > only, it still cranks the car but barely. When the engine runs the > voltage coming out of the alternator is about 12+ V so the alternator > is fine. > Anyhow, the radio stopped working when the battery was to low to crank > the engine at all. This maybe just coincidental, however my question > is if there is some security feature/code to activate the radio after > a loss of power. I checked the fuse (no 30, blue 15amp) and it's > fine. I would think it is unlikely that there is a short circuit > somewhere in regards to the radio. > > So, any special way to activate the radio after loss of power? Its > the standard factory radio and the manual is not talking about any > special procedure. > > Thanks in advance. > Axel |
#5
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Radio stopped working on low battery
"Mike Romain" > wrote in message .com... >I do not know about the grand, but I do know that the stereo in a > Cherokee can blow out from an 'open' circuit on the alternator or no > battery in the circuit to buffer the load. The alternator can spike the > voltage with a bad or no battery connection which lets the magic smoke > out of the stereo. > JUST SO WE'RE CLEAR Magic Smoke is the stuff that makes any electronic gadget operate. If the smoke leaks out, the gadget stops working. |
#6
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Radio stopped working on low battery
"Jeff Strickland" > wrote in message ... "Mike Romain" > wrote in message .com... >I do not know about the grand, but I do know that the stereo in a > Cherokee can blow out from an 'open' circuit on the alternator or no > battery in the circuit to buffer the load. The alternator can spike the > voltage with a bad or no battery connection which lets the magic smoke > out of the stereo. > JUST SO WE'RE CLEAR Magic Smoke is the stuff that makes any electronic gadget operate. If the smoke leaks out, the gadget stops working. ----- LMAO! Jeff... you be too kewel fer skool man! K. |
#7
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Radio stopped working on low battery
> JUST SO WE'RE CLEAR
> Magic Smoke is the stuff that makes any electronic gadget operate. If > the smoke leaks out, the gadget stops working. All transistors are made with smoke. When the smoke leaks out, the part stops working. |
#8
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Radio stopped working on low battery
Scott in Baltimore wrote:
>> JUST SO WE'RE CLEAR >> Magic Smoke is the stuff that makes any electronic gadget operate. If >> the smoke leaks out, the gadget stops working. > > All transistors are made with smoke. When the smoke leaks out, the > part stops working. And the three types of diodes. LED - Light Emitting Diode DED - Dark Emitting Diode SED - Smoke Emitting Diode Speaking of which it's time to track down another transient fault with my overhead console. Bugger cuts out every so often but otherwise is fine. I'm guessing it's the same fault as the VIC had. A bad solder joint finaly gave out. http://revbeergoggles.com/temp/crack.jpg http://revbeergoggles.com/temp/doh1.jpg http://revbeergoggles.com/temp/doh2.jpg http://revbeergoggles.com/temp/nocrack.jpg http://revbeergoggles.com/temp/doh-fixored.jpg The cost of a few cents in solder and wire saved about 1,000 for a replacement VIC. Nuts huh? -- DougW |
#9
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Radio stopped working on low battery
> LOL I bet you believe in "dark suckers" too. :-)
The Dark Sucker Theory For years, it has been believed that electric bulbs emit light, but recent information has proved otherwise. Electric bulbs don't emit light; they suck dark. Thus, we call these bulbs Dark Suckers. The Dark Sucker Theory and the existence of dark suckers prove that dark has mass and is heavier than light. First, the basis of the Dark Sucker Theory is that electric bulbs suck dark. For example, take the Dark Sucker in the room you are in. There is much less dark right next to it than there is elsewhere. The larger the Dark Sucker, the greater its capacity to suck dark. Dark Suckers in the parking lot have a much greater capacity to suck dark than the ones in this room. So with all things, Dark Suckers don't last forever. Once they are full of dark, they can no longer suck. This is proven by the dark spot on a full Dark Sucker. A candle is a primitive Dark Sucker. A new candle has a white wick. You can see that after the first use, the wick turns black, representing all the dark that has been sucked into it. If you put a pencil next to the wick of an operating candle, it will turn black. This is because it got in the way of the dark flowing into the candle. One of the disadvantages of these primitive Dark Suckers is their limited range. There are also portable Dark Suckers. In these, the bulbs can't handle all the dark by themselves and must be aided by a Dark Storage Unit. When the Dark Storage Unit is full, it must be either emptied or replaced before the portable Dark Sucker can operate again. Dark has mass. When dark goes into a Dark Sucker, friction from the mass generates heat. Thus, it is not wise to touch an operating Dark Sucker. Candles present a special problem as the mass must travel into a solid wick instead of through clear glass. This generates a great amount of heat and therefore it's not wise to touch an operating candle. Also, dark is heavier than light. If you were to swim just below the surface of the lake, you would see a lot of light. If you were to slowly swim deeper and deeper, you would notice it getting darker and darker. When you get really deep, you would be in total darkness. This is because the heavier dark sinks to the bottom of the lake and the lighter light floats at the top. The is why it is called light. Finally, we must prove that dark is faster than light. If you were to stand in a lit room in front of a closed, dark closet, and slowly opened the closet door, you would see the light slowly enter the closet. But since dark is so fast, you would not be able to see the dark leave the closet. Next time you see an electric bulb, remember that it is a Dark Sucker. |
#10
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Radio stopped working on low battery
Scott in Baltimore wrote:
<snipped> > When you get really deep, you would be in total darkness. This > is because the heavier dark sinks to the bottom of the lake and the > lighter light floats at the top. The is why it is called light. > ROTFLMAO!! That whole article is just too good, thanks I have never heard that one before. Mike 86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00 2000 Cherokee Sport 'New' frame and everything else in '09. Some Canadian Bush Trip and Build Photos: http://mikeromainjeeptrips.shutterfly.com |
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