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Car Stereo Volume Goes Up and Down Erratically

I have a 1986 Toyota Truck with Kenwood amp about 16 years old and a Kenwood deck about 7 years old. The volume goes down so low I can't hear it and then gradually goes all the way up until it is blaring. My question is, would the deck or the amp cause this kind of erratic volume control? This is a beater pickup truck that I don't use alot so I am trying to avoid spending unnecessary money. thanks

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Prolly buy a truck and a amp from this century

Posted on Aug 30, 2008

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Many head units that use push-button switches have this problem. The switches stick and the volume changes by itself. This can also happen with rotary encoder type volume controls but it's not quite as common. If this is your problem, the switches ae likely available from Kenwoood parts.

Posted on Oct 05, 2007

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97 toyota tacoma v6 3.4 hesatats to start


Check Fuel Pressure with a gauge

If that pump is 16 years old ,it most likely
has a check valve or volume issue, at the least

Do not overlook spark plugs that are in there over 3 years
& a fuel filter 3 or 4 years old

O2 Sensors while not the issue are only good for 100,000

Sep 19, 2012 | Toyota Tacoma Cars & Trucks

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I installed a Pioneer DEH-P800PRS head unit and 4 Kenwood KFC-1662S speakers in my 2003 Dodge Dakota extended cab truck. I used a Kenwood KAC-5204 2 channel amp connected in parallel. Sounds good at lower...


Hello.... sorry to hear about your problem. Bass is the ultimate evil of coaxial speakers. You have a couple of options here, and this is just my professional opinion because I do not know what your lifestyle details, such as truck space needs, type of music you listen to, budget, etc. If you are looking for alot of bass, the best bet would be to use 2 external amplifiers, 1 for the interior speakers, and 1 for a subwoofer. You would then need to purchase an electronic crossover. With this setup, you can remove all of the low frequencies from the coaxial speakers and put them where they belong, with the sub. You will gain EXCEPTIONAL clarity and a very high volume before distortion level. Again it will depend on what your budget is and if you are willing to compromise on some cab space. The only other option you have at this point is if you are wanting to play your music at high volume levels, you will just need to reduce the bass level as you increase volume. I hope this has helped. Good luck with your venture!!

20 year car audio/video installer
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16 year old Blaupunkt Toronto SQR 48 on/off/volume control knob ?


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Mar 03, 2010 | Car Audio & Video

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I cannot get the volume to go above +13 therefore I cannot hear from the speaker son my kenwood vr-5900. It is about 7 years old.


Ok one more clarification, does the volume knob spin infinitley or does it have a set min and max. If it spins infinitley it is an encoder. What an encoder basically does is send a binary signal to a decoder chip which in turn should control a digital potentiometer. Unfortunatley one of these components may be bad.

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I got a pyle 1800w amp and a 1500w kenwood subs but as i increase the volume in the headunit it goes on protect mode why the other problem i got is as increase the volume in the headunit the bass of the...


The protection modes in these units ****. Most new units have them. What I do is turn down settings on deck and turn up amp as much as possible. Then the protection won't turn on because you won't have to turn it up as high.

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Deck shuts off, when loud, while idling or at stop lights.


You are working your deck to hard, it is overheating and shutting down (protection mode) You like it loud, you will need a 4 channel amp. Also check the ground on your deck to ensure it has a nice connection.

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Removing the 8o amp main fuse from 1986 Toyota pickup


yes, you must remove the top panel on the fuse block the 80 amp fuse is bolted to the the fuse panel, hope this helps if not get back to me as i strive to be the best please rate my fix Thanks Ray

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I just bought a Kenwood KDC-MP438U I installed all the wires right, power is to the deck because it accepts a cd. the deck face doesn't light up. I called in at Kenwood and they had me test it directly to...


Check your Ground Wire inside the Truck and Check the Illumination Wire. I Think on Kenwood the Illumination Wire goes with the Power Wire. If they still will not work, You might want to get a Wiring Harness from Schoche.com Please Rate My Response! Thanks!

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Radio shuts off at volume of 16 or more


Maybe a protection component cutting in.
If you have speakers that are too powerful for the radio it may shut down to protect the amplifier from overdriving the speakers. That produces too much heat in the amp chips/transistors and they either have a overload cut out protection circuit or they burn out.
Even if the speakers are the stock fitted ones the wattage could be bigger than the amp in the radio can handle.
There's probably no way of knowing how powerful the speakers in the truck are but you could try the radio with another set.
Max 50 Watts for that radio. If you don't have the manual for it, it's available here:
http://www.kenwoodusa.com/Support/Car_Entertainment_Owners_Manuals/#_

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4 Answers

Volume turned up, kenwood shuts off briefly...


I had this same exact problem when my last older Kenwood Marine stereo cooked itself while I had it up loud for a few weekends on the lake. (smelled like it had burned inside). I went out and bought a new Kenwood KMR-550u stereo deck. (I do not have an additional amp). I hooked it up to the exact connections where my older Kenwood stereo unit had been hooked up, as I never had a problem with this for the past three years until it failed after smelling of burning elelectrical. I had chalked the problem up to heavy rain we had one day. Every time I turned up the volume, sometimes up to 27 out of 35 possible, or 29, or 32, the stereo would suddenly shut off as if I had turned it off. After a few seconds the stereo would come back on, but unless I was quick enough to turn down the volume it would do it again right away. Of course on a boat, we were beached in a cove and the engine was not running when I encountered this. I searched the internet finding hundreds of similar complaints and several dozen theories of all types, but only a couple that pointed me towards the power (voltage) idea as the problem. I put a volt meter on the positive & negative wires powering the stereo. I watched as I gradually turned up the volume, the voltage on the power wire gradually decreased from 12.5 volts, down into the 11 range, and as it hit 10.9 or 10.8 volts it shut off typically around a volume of 32. The red power wire in my boat that never seemed to have an issue with my old stereo until it fried was determined to actually be inadequate for the power flow for the new Kenwood, and probably was the culprit of my failed older unit. I offer this sound advice: Run a new pair of positive & negative wires directly from the battery (with an appropriate fuse of course (the deck has a 10 amp fuse in it's back so I would use that at the battery) to the stereo. Check the voltage as you turn the volume up into the high 20's and low 30's to ensure you are still getting voltage in the mid to high 11-12 volt range. The stereo is designed to require a minimum of 10.8 volts to operate, and when it drops below that it protects itself and shuts down.

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