Chevrolet and GMC Troubleshooting Stereo = Car Stereo HELP

GM - Pick-Ups, S-10, Silverado, Suburban... See CarStereoHELP.com with MODEL and MAKE for MORE... 1988 - 1994 Troubleshooting Car Stereo and Repair

[@christen1075]

Thank you. You've no idea the amount of time I spent trying to find out not only what "CDM" means but you gave a clear explanation of what it actually does. You're the best!

[@luckycolblt5676]

Thanks! I’m 16 and my first project car is a 1989 Chevy step side. This was very helpful

[@UGKsta]

Now you’re 18 how is it going mow

[@loco10075]

Very helpful video. Brought my 1990 GMC Sierra stock radio back to life. Big THUMBS UP

[@Ponykeg53]

I just love it when I luck out and find a guy who knows what he's talking about . Thanks. I have been down under the dash in the area of the of the CDM and replacing Brake light and back up light switches and the radio minstrelsy quit working. I bet I find I may have pulled the plug out somehow. or the CDM in on the fritzes the clock is indeed stuck at 1:00 and nothing adjust. Thank you very much.

[@daehr9399]

This helped a lot with troubleshooting current draw and also thank you for showing how to access this stuff!!!

[@kellyd887]

Perfect. Just wanted the location of the 3 bolts & how it drops out before I stick my head under the dash. Saved me some time and a literal pain in the neck !

[@justplaintommy63]

I've owned a few used trucks in this age group and only one had a replacement stereo in it. I prefer the OEM stereos. I just picked up another one with a JVC aftermarket radio in the center of the dash. I hate it. Every time you touch it some new thing happens. But the Control head is there so I'm going to see if it works. Thanks for doing this video, now I know what I'm looking for and have a better understanding of what goes into this.

[@donhess2978]

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[@jimmybritt9537]

Thank's for the vid 👍👍🇺🇸

[@mackenziegeorge5989]

Thanks a lot. Now I have a better shot at fixing my radio

[@mikewolfe789]

Great video do you know where the single white wire goes that comes of off the equalizer/tape deck I have no lights on the tape deck

[@dDayye]

So a stock radio system in a 1992 GMC does not have a separate amplifier? I pulled out the control head and cdm unit and replaced with a after market Jensen, powers up but no sound at any speakers.

[@bobpitman4949]

Thanks for putting up this video. I do have the same problem discussed with my radio and clock. I had been told by another person that the "brains" for the radio was just to the right of the accelerator - but I could not find it. Your video makes it easy for me to find and pull out this CDM box. Are replacement CDM boxes available in parts stores? (My vehicle is a 1993 GMC Sierra.)

[@boblizcou]

I repair these units, see website.

[@roberthernandez6948]

@@boblizcou can the radio and clock work with an aftermarket CD stereo ? .

[@fernandogonzalez1394]

Friend, how are you, I have a 1988 Silverado, the stereo doesn't turn on, it just shows the clock, I would like to know if you can help me.

[@playsportfun3356]

So, when I turn my volume all the way up. My left rear speaker faintly works. The other 3 nothing. I get a high pitch whir of the engine. Do you think this is the CDM or maybe a antenna connection issue? Front right speaker looked OK. Only one I looked at.

[@alexxrider89]

Thank you very helpful to learn about my unit. Also if installing an aftermarket pioneer radio. Will I need to keep the lower unit for use ?

[@MrDave1957]

hello I have a question I have a 1992 GMC Sierra with the same set up with the radio on it lights up clocks works radio channel works and the volume bars light up and will move up and down and when you adjust the fadder and frt to back it displays as well there is just no volume my best guess is the amp under the dash thanks David

[@bamiller6506]

Same issue I have.

[@maloz_pasoz8429]

Hey i have the same year sierra and am experiencing the same problem. Did you ever find a solution?

[@maloz_pasoz8429]

@@bamiller6506 Any resolution? im seeing the same thing on my 92 sierra

[@ChrisBairDrums]

Anybody solve this issue? Everything works but no sound or static

[@shtfvan8084]

Any1 find out thw issue?

[@kenc7958]

I have a 93 gmc sierra with radio, cassette, equalizer, never had any trouble out of it until the other day when I had a bad ground on the battery. I was going down the highway when it started acting up with dash gauges going off and on, truck cutting off and on. I stopped repaired the ground, everything was ok accept the radio would not play anymore. All it would do is show time at 1:00, station at 98.1 volume about half way, can't change it. You can turn it off, but when you turn it back on it does the same. I have checked the fuses, all ok. I would like to repair it and keep it original. Do you have any suggestions? I would appreciate any suggestions to try. I have learned a lot watching your video. Thanks

[@Hammerjockeyrepair]

ever solve your issue?

[@kenc7958]

No, never had a chance to really get into it. I am retired now so I am going to look at it again now or replace the whole thing. I would prefer to leave it stock if I could.@@Hammerjockeyrepair

[@ColsynO]

You need a new cdm @kenc7958

[@6.2ldetroitdieselmafia]

I've seen some control heads.Having 2 sets of wires coming from the back of them?I have one control head unit that has 2 sets of wires.The one set of wires being a yellow and white.What does that go to

[@jimmcmullin6406]

I replaced my Bose factory amp with a used amp from EBay for my 2005 GMC Sierra. Exact match it’s came with warranty bench tested. Installed and still no sound. Checked all fuses. Ok Do you have any ideas . Thanks Jim

[@TheDonorak]

Thanks i just bought a 93 sonoma back in 2020 the radio isnt working at all so ill follow these steps to see what the issue is.

[@wallace7108]

How did it go

[@ryanking7423]

I have a 92 Chevy. Control head and cassette/eq works. Clock, seek/scan, fast forward, reverse and eject all work. I checked all the fuses. Still no sound, no static nor distortion, nothing. Any ideas?

[@Hammerjockeyrepair]

dead speakers

[@Billy_M_Gamer]

Mine was working and speakers but some how now the wiper want work or power windows eaither but on the radio the clock pops up and that's it and no fuse blown and all grounds seem to be hooked up good? Jw if that is a cdm problem too that would cause all this?

[@richardsmith2761]

What would be the issue if I have to turn volume all the way up to hear anything? My aftermarket unit with same speakers does not have this issue so I know it’s not the speakers

[@mikewolfe789]

Great video is there away to refurbish the radio buttons mine are faded and bad shape?

[@bendid3400]

You should do a video of how to install an aux to the c.d.m. I cant find any for 1989-1994 cdm. All videos are for newer radio or the pre 1987 cassettes.

[@noblsht]

Good point, I just bought one of those $160 off of eBay he might not want to tell because maybe he selling theseUnits with the auxiliary connection

[@brandonsmith340]

Like I could use in dash cd player outta, say a 95 to 99

[@bendid3400]

@@noblsht hey, I actually posted a video of how to do it. Check it out.

[@randy1ization]

should the radio power up if I send 12volts to the red wire (ignition power).. and black,, ground wire. I have a 93 c1500 with the delco radio../ ? the reciever module is missing,, so in trying to find out if the radio is good so I can get another reciever

[@noahmattiello6739]

I have a 1990 c1500 Silverado. My radio volume and channel tuner will go down but not up. Any idea what the problem may be. Please answer

[@Hectorson3]

my trucks CDM went bad a couple of years ago, I replaced it with another and now the stereo comes on but no sound, could it be I got the wrong one?

[@djdud132]

Could be you blew a fuse in swapping it

[@lafamillebrassard7692]

Very helpful

[@reenobakke6125]

do you know why there is no lights on my control head, it looks like there is a bit light but no where near that i can se anything

[@codyberg91]

I wonder if there's a way to have the clock head be used as a controller to control the aftermarket radio deck turn the channel vol preset and show the clock ...it be convenient so you don't have to lean over to adjust the radio in the middle of the dash

[@matthewbryant2735]

My 92 was 1 of the 'Mark3 Conversion' upgraded trucks, so it has a cd changer behind the seat. Cd changer is in place but head unit & tape deck/eq are NOT (removed by PO?)! Will any head unit work as a replacement or will this require a specific model unit? Does this setup require a tape deck/eq or does the cd changer eliminate the option of a tape deck? Specific Tape deck/EQ? Does it need a Specific control module? I would like to have all 3 parts together and working.. though ill probably never use anything but radio.

[@TheDieselWizzard]

by any chance do you know where that single white wire with black plug goes?

[@joequillun7790]

thanks for the tips.

[@MrTarkus007]

my radio is stuck on 98.1 & the volume or the station wont go up or down what could be the problem ??

[@ceeC13]

Mine too

[@Pennysdad63]

@@ceeC13 he covers this in the video. Mine is doing the same thing. Replace the unit under the dash located above glass petal.

[@marianatequiero28]

Me too! ....Hey I’m Nick Diaz yaaa

[@lafamillebrassard7692]

What does the P-LT wire do?

[@jamesjackson2317]

My Suburban has 6 factory speakers and my new stereo only has hook ups for 4 speakers. How do get all to work right and not have any problems?

[@thrashman1973]

Is it possible to use a later model stereo head and still use the equalizer and cassette player that came from the factory?

[@6.2ldetroitdieselmafia]

That's what I'm wondering too, but I think they are. Year specific like each component is year specific to the vehicle make and model.

[@g.supreme7018]

If im missing my volume buttin n the rubber part under is missing. Hiw can i make turn it louder? Will a paper clip work? 89 silveraldo

[@markosborne2357]

When I bought my 1994 1500 it had no radio..it was obvious there had been an after market stereo installed...i have bought a radio and an adapter ...but I can only find two of the trucks connectors - the third (which is apparently the power supply) I can't find....the two I CAN find are bound together and fit just fine in my adapter...am I just looking in the wrong place?

[@6.2ldetroitdieselmafia]

What does (ETR) mean for these radio sets because mine has the radio set with tape cassette deck w/o the (eq)

[@LancerArmada]

How do you repair the CDM when the radio head is stuck at 1:00 and the buttons don't work?

[@cherylmonroe8522]

I have this same issue. I have my cdm removed, now I just need to have it fixed, or find a new/used one. Advice appreciated!

[@charliep8666]

Engine noise whining when you accelerate. Any ideas?

[@1g2e3r4te6r]

Any feedback for uneven sound output threw speakers? New speakers, refurbished cdm. Polarity is correct on speakers. Thanks!

[@MNLakesArea1GC]

I have no fm reception on my radio, how would I go by fixing this?

[@superman12091]

Hey man. I just picked up my dream truck. 91 k3500 dually 454 with a muncie 4 speed. My volume up button is not working. Is there a way to disassemble the unit to clean the button contact? I'd really like to keep the factory style head unit but dont want to have to replace the whole thing. Thank you for reading. And please help.

[@crackerjack4u]

@Factory Car Stereo Repair. Ours started where it almost acted like it had a short in it then we could hit the dashboard above the radio and it would come in great, but now everything powers on but no sound will come out of the speakers. :( Any suggestions where we should start on troubleshooting this issue? Thank you!!

[@isaiahslawncare8600]

Im having same issue

[@Faith-mo6vr]

HELP!!...I just got a 93 cheyenne and the radio is bad, but on the wiring from the radio there is attached a white individual WHITE wire, i'm not sure what it goes too.. We pulled it from another truck but didnt look to see where it was pulled from. anyinfo would help. THanks

[@bluecollara-hole4701]

Had all the radio pieces out. Watched this video. Got to the part when he was talking about the system having 2 fuses. Sure as shit. My courtesy fuse blew. Wtf gm 🤣

[@jptrustno1]

Will the stereo work without the eq/tape player missing?

[@lafamillebrassard7692]

Yes

[@mmelbourne63]

Only my front driver side speaker comes on. Is this a CDM issue

[@poolmotorrepairguyFL]

how about non working buttons, and cleaning the pads ???

[@wakeywakey4289]

I have the same setup but getting a lot of engine interference which increase as the engine rpms go up..have any suggestions?

[@kevindavis4709]

Me too.

[@lancebandy9901]

What kind of plug wires are you using?

[@matthewbryant2735]

Just drive slow

[@nickspy]

Same here! Did you work out a fix?

[@MF-kb2nv]

@@nickspy No its still without a radio

[@alexis3930]

I have a question my radio does turn on at all I just want it to turn on

[@troycoates3176]

Great video, What if my display is blank, any hope?

[@MikaeleIosefa714]

Thanks for this video new subscriber. I have a 93 and when i removed the old stereo i noticed a lone white wire connected to the receiver. What do i do with that? Do i use it? or cap it off? Thank You!

[@mikewolfe789]

Did you ever figure out where the white wire goes and it’s purpose?

[@MikaeleIosefa714]

@@mikewolfe789 I didnt. I ended up capping it off and only using the the negative and 2 12 volt wires from the stereo. I re wired the speakers and left it at that.

[@mikewolfe789]

Thanks for the quick response! Anyhow question I have power going to the head unit from the cdm but no light on the eq any suggestions I know these are getting hard to come by now days do you know what wires power the eq so I can test it by it self?

[@MikaeleIosefa714]

@@mikewolfe789 I have the haynes repair manual I'll see if I can find it in there. Mine only had the tape deck without the eq.

[@MikaeleIosefa714]

@@mikewolfe789 in the book the graphic equalizer wires are purple, red/white, white, and gray. Since I didnt have the eq that might be why I didn't use it? Just speculating there but makes sense.

[@sandraprimas1107]

hello I am French I have a delco radio like yours in the photo, it is blocked I cannot set the time, neither the volume nor the stations, would you have the unlocking solution thank you

[@jeffchristie-od5gu]

Equalizer & cassette indicators are bright as new. Tuner powers-up, adjusts as designed, & clock works as designed. Tuner brightness is dark & impossible to read with sunlight on its pane. No sound, whatsoever. What might it be?

[@MrKraftj]

Thank you.

[@RyanWoodard911]

Can you by pass the cdm when installing a aftermarket radio

[@ChrisN85420]

yes you will be taking the cdm out

[@gmcoutlaw7698]

So how to fix the Cdm?

[@tonyisaac8053]

Where is the radio fuse at?

[@monicaperry7759]

My system quit changing stations...what shows up is what is there. I can't scan or seek...Any tips?

[@Joey-id6bu]

Im running aftermarket radio where is fuse location

[@warzoneplays3277]

What would it be if only one speaker is working

[@jt039]

My radio is also stuck on 98.1 and at 1:00 and no sound can anyone help will appreciate it ...

[@333n3wk34333]

Its the control module box under the radio. There is a shop in Florida that will fix it for 125.00. They are online... I had the same problem.

[@aaronsceilingfansspeakersa3057]

My grandpas gmc radio was stuck on 107.9 and we replaced it

[@matthubbard3961]

I have a 1992 silverado the clock and the radio illumination stay on u can operate the radio but with no volume it's draining the battery any ideas

[@mikehickman3635]

Unplug radio it plugs into bank directly under ashtray its a 4pin white plug 👍

[@Joey-id6bu]

Where is radio fuse located

[@MrTarkus007]

what does a new cdm cost & where do you purchase 1 for a chevy silverado 1990 & do you think it's a good idea to get one from a recycling yard?(scrap yard)

[@christianguzman8228]

It's hit or miss with Junk Yard, and most of them around me will not give you returns but credit for electronic parts. I picked up a working radio from a junk yard, however, the heat unit and equalizer didn't work.

[@terrybrown797]

I have a 89 Chevy Silverado my stereo turns on but I have no sound no volume control or tuning ability the display does not change

[@rickykline4503]

Thank God for the internet

[@mark97213]

Is the CDM solely responsible for the radio becoming un tunable or unable to change clock or any other function in the radio?

[@poolmotorrepairguyFL]

the buttons contacts need to be cleaned, sometimes just a shot of tuner cleaner will fix it. a way cool fix as you just spay and done. warning not all tuner cleaner is the same some eats plastic. do a test spot.

[@OHCJOE68]

Hello I have a 90 Silverado and I have really low volume at Max any ideas what might be wrong

[@BillTheBuilder]

Me too, and I can hear the engine whine sound through the speakers when the radio is on. Anyone know what's wrong.

[@cavalierliberty6838]

I got this problem in my Cheyenne I just got. I'd love an answer as well

[@tokenoftimetokenoftime8154]

My 93 chevy Cheyennes radio stopped working while I was driving. If I restart the truck the radio comes on then makes a popping sound and stops working. Lol. Any ideas?

[@noblsht]

Yes electronic box in the dash is toast garbage history you can find replacements on eBay, I'm having all kinds of issuesI have replaced equipment and stillIt doesn't power on,,He said that it is a two fuse systemI jumped to the conclusion that I had another blown fuse , the first fuze that said radio did blow but there's no second Blown fuse in the fuse boxI 'm puzzled now😐😐😐

[@tylerhorsley8857]

Radio turns on but i cant turn it up or change the channel

[@jonathandexter135]

HI Factory Cr sterio repair. my Truck radio was fine. I restored the truck put it all back together. The radio works fine. But when I push the brakes the radio light goes out. I have had it all apart twice since checked every ground I could find and still can't solf the problem. Any experience like this before?

[@deathmetalmachine]

My radio doesn't come all whatsoever I need help I got the same one butts it is an 1988 Scottsdale

[@coreyrides9650]

I'm having the same problem did you figure it out?

[@coreyrides9650]

I am having the same problem did you figure out what it is

[@matthewackerman8798]

My issue is that when my clock freezes and so does the radio, ill disconnect the battery cable and reconnect; everything works just fine until the next day, everything reverts back to being frozen.

[@kyledietrich2538]

What would cause the right side speakers to not work?

[@garretnichols7634]

Kyle Dietrich mine is the left side don’t work

[@0ranutan]

@@garretnichols7634 Did you ever get it fixed or figure it out?

[@Luke-oe5qi]

I'm having trouble with the cassette player I put a cassette in and it trys to play it but it makes click noises help

[@noblsht]

Very common problem it is toast there's no repair for that You can buy replacements on EBay Even my new replacement in cold cold weather wants to do that The previous one was doing that

[@denisemoseley9662]

I turn on the radio but no sound at all 😥

[@txta786]

my equalizer display is not working :(

[@junkwire]

You do realize that at 5 minutes, forty seconds, the hiss dropped out of your video when you unplugged the antenna. I'm pretty sure the ring counter, if stuck at 1:00, and your receiver because of the hiss, are toast. I'd say, due to the labor cost of rebuilding, or the cost of manufacturing, a new one, it's time for a new system.

[@juandiego2750]

Hi am trying to install my oem 1988 sound system but somebody remove all the wires and am tryng to find out witch wires are speakers and feeders on my amplifier, could you help me please !

[@fernandogonzalez1394]

My radio doesn't turn on just the clock, I bought a DCM at a junk store but it still doesn't turn on, I think I'll put in an Amazon radio

[@1rutcutter]

1993 model GMC.. I have no sound on the system everything works but no sound,was getting sound every once in awhile then it would go off.. Any idea what the problem could be?

[@lee9869]

Eldon H I got the same issue. Did u get it figured out?

[@kyleolson6749]

Eldon H any update on fixing the issue?

[@crackerjack4u]

Same issue here too. Ours started where it almost acted like it had a short in it then we could hit the dashboard above the radio and it would come in great, but now everything powers on but no sound will come out of the speakers. :( Have you had any luck finding your solution?

[@joequillun7790]

X4 here. Guess there's no hope for any responses.

[@austinnegron5639]

My 1995 Tahoe Radio does not work! No sound. Nothing.

[@ComputerTech95]

I test drove a 91 GMC Sierra the radio worked but just all static

[@blairjosephbernard2011]

NWS storm chaser I have same problem and gets louder when driving to

[@darthkarroto2183]

Can u play your own music like aux?

[@robs_garage0278]

You can if you were to buy a cassette adapter to put in the cassette player that's what i did on my 92 gmc cause i love that stock radio

[@johnh5875]

Can i replace this system with a double din stereo and bypass the CDM, which I think is shot in my case.

[@deadcatsmakesmehappy]

not helpful. how do you switch from radio to cassete mode????

[@corykline9769]

hey

[@mikekiefer6462]

Does anybody know what the dimensions are on the factory stereo?

[@tylerhorsley8857]

Shoot cd problem dangit

[@PhosHodosLogos]

I have one in an ambulance I bought. The clock is on but the radio is not responsive no matter what button I push

[@fernandogonzalez1394]

friend you found the problem, my truck is the same, thanks

[@PhosHodosLogos]

@@fernandogonzalez1394 The previous owner of the ambulance had disconnected the radio from the back. They didnt want the workers listening to the radio.

[@fernandogonzalez1394]

@@PhosHodosLogos thanks

[@miguelfigueroa326]

i have no sound on the system everything works but no sound, also the equalizer show only 2 controls not all

[@vickiechristian1621]

What did you do to fix your problem

[@maxwellbrown2584]

I've got the same problem

[@thangamajig]

Just get rid of it..

[@thangamajig]

Mine won't turn on.. The truck has been sitting for a few years. Bad key pad I guess.

[@rareblues78daddy]

Some people would like to keep the OG equipment, though. Mine works fine after 28 years (cassette player included;) turns out the antenna cable had just come lose.

[@lxdead5585]

I have problem with my 95 Chevy Beretta tape player. Radio works just fine, when I bought the car tape player worked too but after changing the car battery it started to sounds like "faded" with crackling sound when on high volume. Do You know what might be the problem?

[@kyleklunk6333]

What would cause the lights in theradio buttons not to light?