i have changed the radio tuner and radiobox that under the dash stil no sound all buttons work no sound
You did not mention if you changed with New, Rebuilt or Used..........
The Tuner / AMP Box is known to have problems & typically you would need to purchase a Rebuilt.Be sure the one you installed is "exactly" the same Model Number as what came out (if it is stock)You should Test Speakers by connecting jumper wires from a AAA or 9 Volt Battery & "breifly" touching the Positive & Negative wires of the Unplugged Unit Plug
Wires at plug are:
Constant 12V+ Orange Switched 12V+ Yellow Ground Black Illumination Gray Front Speakers;Left Front (+) Tan Left Front (-) Gray Right Front (+) Light Green Right Front (-) Dark Green Rear Speakers ;Left Rear (+) Brown Left Rear (-) Yellow Right Rear (+) Dark Blue Right Rear (-) Light Blue
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There were 3 different models, with & without Cassette, with Cassette & Equalizer & with 4 way fader
It is important that you are sure the correct Unit is installed with the Head Unit up top.The Head Unit up top is just a Keyboard.
i dont think all 4 would be bad what do you think it could be
sorry, not correct, as I have seen "4" bad many times.This is a 1993 & paper cone speakers (if there are 4) do go bad
This is why I gave you wire colors to "pop" the speakers with a AAA or 9 Volt Battery to see if there is any sound.Be sure Plugs are disconnected from Unit
Also be sure to check Voltage on the ORANGE & YELLOW wires with Key OnYou should hear a distinct "click" in the lower Box, when the Unit is turned On