I put sony cdx-427 radio in my bmw everything works just no sound out of speakers? its a 1992 520i. i tried a really old kenwood radio: works! HELP!!!!!e.

Margaret, this is free public forum , demands don't play here (free)
and you double posted. why do that.? if you wish to elaborate
try posting below 1st post, as an add.
and for better help? why not post to a BMW forum. (faster)
and no car year, posted or car options listed.

Radio year, model and Car Cell phone options.

no matter.......
the first check on all electronics, is the fuse
most radios have 3 power sources, (to make all features work)
and fuses are on all 3.
have you tried all sources, AM/FM CD, MP3 USB (if opted) .
are all modes dead?
the next check is to try all buttons on the radio. ?
is there a mute button? if car has 4 speaker try the fader lever.
front to rear. left to right , still dead.?
cycle modes. radio, cassette, CD 6 pack , what ever, but do cycle them all as older cars the mode switch can stick.

The RDS is radio station text messages. for song titles.
including time, station identification and programme information.
if this part really works, the RDS part this means the radio is working, but the power amp is dead or muted.
try balance and fader.
many radios (1000s) have fuses in the radio for the speaker amp
that can blow. (shorted speaker wires a prime reason)
or some have in line fuse. and others are in the cars fuse box
which varies by maker or model year.

ok , im looking at the stock radio on level C stock 1991 radio
and even back when (stock to me) the is RADIO muting
so if your car has Cell phone muting bingo that.
and a fuse at rear of radio, (unstated purpose)
guessing,id say there is lamp that glows, CELL mute?


conclusion, no car year stated, or year radio of not origional.

Your best bet is to take it to a professional car audio installation establishment.

try hooking the radio power wires to the battery! To '' TEST'' twist red and yellow put on the poss. blk. on neg. ! take a speaker and test speaker wire out put! if don't work output is blown out! but will still work with rca jacks hook to small amp ! this to pull sound out of your radio for sure!!

2000 BMW 328i Car Stereo Radio Wiring Diagram.
Radio Constant 12V+ Wire: Red/White
Radio Switched 12V+ Wire: Purple/White
Radio Ground Wire: Brown
Radio Illumination Wire: None
Radio Dimmer Wire: None
Radio Antenna Trigger Wire: White
Front Speakers Location: Kick Panels
Left Front Speaker Wire (+): Yellow/Red
Left Front Speaker Wire (-): Brown/Orange
Right Front Speaker Wire (+): Black/Red
Right Front Speaker Wire (-): Brown/Orange
Left Rear Speaker Wire (+): Yellow/Black
Left Rear Speaker Wire (-): Black/Orange
Right Rear Speaker Wire (+): Blue/Black
Right Rear Speaker Wire (-): Brown/Orange

check your wiring, make sure its not grounded behind the dash somewhere

What happens if you turn the VOLUME to MAXIMUM?

If still no sound , then suspect problem with the speaker , connections or wiring

If loud hissing etc. then speakers appear OK so suspect a radio fault

lay out new speaker wires and that way bypass the amp altogather Kenwood radios have power to move speakers without an amp

If you had followed the directions correctly and the old speakers worked as well, take the new radio back for exchange

just a thought is the radio a kenwood if it is ther is yor problam . bmw dashes get verry hot and kenwoods dont like the heat i have had this problem more than once

I had the same problem.. and I fixed it. The problem is the stock amplifier under the passenger seat.. What happens is you are pushing more amps from the cd player through the amplifier than the amplifier put out in the first place, so the amp acts as a resistor, and for some reason it causes the speakers to cut out when turning signal, brake lights, wipers, or any lights/electrical are applied. The only solution I know is to wire straight from your cd player to the speaker itself.. it's kind of a job but if you like wiring etc. it turns out alright.
Hope this helps,
Kyle