2JZSHOTTAZ

Hello, Car is a 2013 GS350, about 70xxx miles.

Radio unit works, but when turning the volume **** nothing happens. It doesn't show the volume going up or down, and I cant hear any sound when moving the mousepad.
This has happened before and when I changed the radio fuses that fixed it. However, when I changed them this time, it still doesn't work.

I changed both radio fuses and the multimedia fuse from under the glove box, is there any other one to check?
Or could it be the amp is bad. Any way to test it?
Thanks in advance.

Knucklebus

Do the volume buttons on the steering wheel do anything?

2JZSHOTTAZ

No, they don't do anything either.

AJLex19

Sounds like a bad amp...Does the navigation voice/guide/chimes make any sound through the driver door speaker?

2JZSHOTTAZ

No, nothing. I'm going to double check the fuses one more time.

2JZSHOTTAZ

Also before I buy a replacement the one that I have is 86280-30670, would the newer 86280-30740 work as well?

peasodos

iTrader: (1)

Any amp from any year of the 4GS will work for your car only thing that matters is if it's mark levinson or not.

jgscott

iTrader: (1)

I think its the Head Unit = Source, because the Radio is not indicating volume going to the amp. Normally when amps go, you get some sound of a sort, be it a crack, pop, hum or whatever.

Does any other source selection play and/or make noise of any kind like aux, cd, or other? I could be wrong but I don't see how the amp could prevent the Headunit source from displaying volume level, so I don't think the amp is getting a signal to amplify.

peasodos

iTrader: (1)

Try a used amp on eBay with free 30 day returns, where seller pays return. The amp is easier to swap and if it doesn't work doesn't cost you anything.

jgscott

iTrader: (1)

Yep I was thinking the same thing about the amp swap return on ebay. The headunits seemed to have hit or misses with ppl getting the ebay or salvage ones to work. I know someone who got 3 different ones before they got a good one that worked on the 16+ upgrade.

Another reason why I thought it could be the Head Unit here. But you are correct, I would make sure it matched exact (amp), buy from a Seller on ebay with Free 30 day return and see what happens? That would let you know if........ the amp you bought was known to be good.

2JZSHOTTAZ

I don't think so, but ill check one more time.

Yea, looking for one now.

Shello

Had the same problem start on mine yesterday. This seems to be a common issue. What could potentially be the cause?

EpikSc400

Water got to my amp a few months ago and I had the same things happen. I just dried it out the best I could and luckily after a couple of days it started working again. No issues since. If no water damage maybe a connection inside got loose and needs to be soldered, idk, just a thought. Good luck!

2JZSHOTTAZ

Hey, after a few days I disconnected the battery and reconnected it, and everything started working again. No water damage and the fuses weren't blown.

Saadq12

If the no sound issue is intermittent more than likely there’s some water damage or moisture in the amp. Best bet is to take it out, dismantle it and clean it gently with isopropyl alcohol or electronics cleaner. I made a post about fixing mine earlier this way.

put some sort of towel or silica pack or cover the little area with the amp clamp downs to prevent moisture from getting in.