Jeremy Laukkonen is automotive and tech writer because that numerous major trade publications and the creator that a famous blog and video game startup. A pan of EVs since the beforehand 2000s, he continues to be up-to-date ~ above the myriad complex systems that strength battery electric vehicles." data-inline-tooltip="true">Jeremy Laukkonen
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mmsanotherstage2019.com / Theresa Chiechi 

While that is possible for a auto radio to fail altogether, there are a the majority of internal and external concerns that deserve to be solved well quick of total replacement. Few of the most common issues incorporate a blown fuse, bad or damaged wiring, and anti-theft modes that are often triggered as soon as the battery dies.

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In order to track down the reason that your car radio won't revolve on, you'll desire to tackle each of these potential concerns one in ~ a time.


Verify the Unit Isn't in defend Mode

Some head units have actually a security attribute that avoids them from operation after power has been interrupted. The idea is that the head unit will certainly be rendered useless if it is stolen, which is claimed to deter the theft of this units.


In part cases, a head unit through this feature will “turn on” in that the display screen will activate, yet it will only show a message such as, “code,” and also fail to operate. In other cases, the head unit will show up to be totally dead, and you will have to enter a password or perform an additional manufacturer-specified procedure to gain it working again.


Before girlfriend get any kind of further right into the diagnostic process, friend will desire to verify the your head unit no have any type of sort that anti-theft mode. If the display is totally blank when the unit falls short to strength up, that is a good indication that you’re in reality dealing with one more problem. However, you might want to consult the owner’s manual, if you have accessibility to it, or contact the manufacturer if girlfriend don’t, in order to verify the there no a particular procedure the you will have to follow.


check the Fuses

After you have actually verified that the unit is actually failing to power up and also that that hasn’t gotten in an anti-theft mode, the next step is to check the fuses. At this point, you"ll desire to break out some simple car diagnostic tools, choose amultimeterand a check light.


Most automobile radios have either one or 2 fuses that you’ll have to check, and you may also have car amp fuses and other related contents in the mix. One will be situated in your vehicle’s main or accessory fuse block, and also it will often be labeling in an apparent manner.


You can test an automotive fuse by visually inspecting it, or you deserve to use a multimeter or check light to inspect for power on both sides of the fuse. If girlfriend have access to a multimeter or check like, that's the better way come go due to the fact that it is possible for a fuse come fail in such a way that that is complicated to call one method or the other just by looking in ~ it.


Some head systems have built-in fuses, generally located on the earlier side, and some installations have extr in-line fuses located somewhere top top the power wire or wires. If any kind of of this fuses are blown, that may be the reason that your auto radio won’t revolve on, so girlfriend will desire to replace them to watch if that fixes the problem.


Of course, a swollen fuse is regularly indicative of another issue, so you need to never change a puffy fuse with one of a larger amperage.


check the Pigtail Connector

Before you progress any further right into the diagnostic procedure, friend will need to remove the head unit to gain accessibility to the wiring. Through that in mind, you may want to examine to check out if the pigtail connector is seated properly in the head unit.


If there are any kind of doubts about the pigtail, you deserve to remove it and also replace it, ensuring that it seats properly. If your details installation has actually an adapter the connects between the head unit and the factory wiring, then you can also unplug the entire thing and also reconnect it to ensure that every little thing is making good electrical contact, and also then effort to strength up the radio again.


In some cases, with details aftermarket head units and also adapters, you may likewise find that unplugging the head unit and adapter because that a time will fix the issue. In this cases, you may benefit from leaving every little thing unplugged for fifteen come twenty minutes, reconnecting, and then checking the procedure of the unit again.


inspect for power at the Head Unit

If the fuses are good, and the relations are good, then the following step is to examine for strength at the radio itself. Most vehicle radios have actually two strength wires—one the is constantly hot, which provides power to the memory, and also one that is only hot when you revolve on the ignition key. If these strength wires room reversed, the radio will fail to job-related properly or in ~ all.


Although friend can check for power at the ago of the radio v a check light, you’ll gain a an ext complete picture if you use a multimeter. Because that instance, if girlfriend have less 보다 battery voltage in ~ the radio, describe a voltage drop, it may be complicated to tell through a check light.


In the occasion that you uncover no power at the head unit, but there is strength at the fuse block, you space probably managing a broken wire, so friend will need to trace the power wire ago to the source. That is also possible that there might be an in-line fuse concealed somewhere follow me the operation of the wire that you didn’t notice before.


inspect for Ground in ~ the Head Unit

Poor head unit grounds are much more likely to cause issues prefer ground loops than total failures, yet if everything else check out, friend will want to verify the your head unit has a an excellent ground before you guilty of the unit.


There room multiple methods to execute this, indigenous visually inspecting the ground to verify the there is no rust present and also that that is strict connected, to utilizing a multimeter to check ground in between the head unit pigtail and also a known an excellent ground on the body of the vehicle. In most cases, a poor ground won’t reason the head unit to fail to revolve altogether, while a ground the has end up being disconnected completely will.

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Bench test the Head Unit and Replace if necessary

If your radio has actually power and ground, and also it no in any kind of anti-theft mode, climate it has probably failed, and the just fix will be to replace it. You have the right to bench check the unit by connecting the power and ground leads directly to 12V positive and also negative, if girlfriend like, yet if the power and also ground both showed an excellent in the vehicle, you room unlikely to discover a different result with the unit removed.