I installed a new radio in my 1990 525i bmw. i have power to the radio but no sound from speakers

SO DID NOT SCAN THE PCM FIRST SEE RADIO ERRORS OR COMM FAIL TO IT OR??????? MODERN CARS MUST BE SCANNED OR GO BROKE GUE$$ING.
CHECK FUSES FIRST (3 FUSE BOXES HERE)
NOT TOLD AT ALL
CAR DRIVES OK./??????
DO ALL OTHER ELECTRIC THINGS WORK OR NOT.
GEE CHECK ALL FUSES, IF NO MANUALS, OR BUY THE SERVICE MANUALS?

not told is display on RADIO dead too? and all modes fail
AM/FM OR OTHER MODES ALL FAIL. CD FAIL?
OR IS ONLY SATELLITE RADIO DEAD.??>???
THE FREE USERS GUIDE SAYS OPEN HATCH INSIDE GLOVE BOX . NOT FOUND YET THIS? AND UNDER HOOD BOX.
2ND BOX IS CARGO AREA , COVER TO SLIDE OFF.

WE TEST ALL FUSE, NOT GUESS, LACKING SERVICE MANUAL THERE ARE 100+ LOADS ON 20 FUSES, ONLY SERVICE MANUAL ON ANY CAR COVERS ALL LOADS. ON ANY FUSE.
FACTS. SO WE CHECK ALL FUSES, LACKING THE BOOK

https://www.bmwsections.com/docs/5series/

GOGGLE HITS.

https://fuse-box.info/bmw/bmw-5-series-f10-f11-f07-f18-2011-2017-fuses-and-relay

BUT NOW YOU MUST LEARN GERMAN CRAZY NAMES FOR DEVICES, (NOT REAL NAMES JUST SILLY NUMBERS CODES)
THAT TAKES A REAL MANUAL TO LEARN

OR THIS
https://www.youcanic.com/bmw-radio-no-sound-speakers/


GUESS #1
DID NOT LOOK IN ALL 3 FUSE BOXES FOR BLOWN FUSES
DO KNOW THAT MOST HEADENDS ARE THEFT SECURE
AND SOME JUST KILL DEAD SOUND WHEN THE LICENSE CODES IS LOST EVEN MAIN BATTERY DEAD DOES THAT.
ONLY BMW CAN FIX THAT.

NOT SCANNING THE PCM/BCM IS JUST NOT WISE.
CHECK ALL FUSES THEN SCAN THE CAR, OBD2.

I would seek this advice from a radio fitting specialist as fitting anything into a car's electronics can cause big problems . There are many people who contact us with complaints after DIY radios and each one relates to incompatibility with the CPU in the car.

Hi Toxey.

Does your trunk amplifier got power.
basically amp need remote power input it is coming from your radio.
please check when you turn on the radio remote power must turn on.
if no it is radio problem or wire is damaged itself.
please check the outputs,speakers with multimeter or single 1.5v cell.
if power is ok.and the remote on signal is ok your device still not working , it is the problem with power amplifier unit.

please check and let us know the status.
regards.
nuwan

you have to connect speaker wire directly to the radio. Don't have amplifier inbetween the speaker and radio because it is not neccessary. If you want amplifier inbetween the radio speaker wire and the speaker then you most likely the amplifier has another power supply wire and hope that the amplifier does not have any additional control wire thats controled by your original radio.

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

:o( you're going to have to pull the radio out to see what they did. They probably added a wire to an inappropriate circuit to power the new radio or amp. I will paste your factory wiring colors below. If you now have an extra wire, that is the likely culprit. Trace it to see where they hooked it in. If it isn't going to the the fuse box and using an extra slot, make it so by connecting it to the cold side of the fuse and put an approprite size fuse in. To determine the fuse size to use, you can compare the wire gage to other cold side wires and use a fuse the same size as you see being used for similar gage wires. Let me know if you have more questions.

1996 BMW Z3 Car Stereo Installation Diagram
Car Radio Battery Constant 12v+ Wire: Red/White
Car Radio Accessory Switched 12v+ Wire: Violet/White
Car Radio Ground Wire: Brown
Car Radio Illumination Wire: Gray/Red
Car Stereo Dimmer Wire: N/A
Car Stereo Antenna Trigger Wire: White
Car Stereo Amp Trigger Wire: White
Car Stereo Amplifier Location: Passenger Kick Panel
Car Audio Front Speakers Size: N/A
Car Audio Front Speakers Location: N/A
Left Front Speaker Positive Wire (+): Yellow/Red
Left Front Speaker Negative Wire (-): Yellow/Brown
Right Front Speaker Positive Wire (+): Brown/Black
Right Front Speaker Negative Wire (-): Blue/Brown
Car Audio Rear Speakers Size: N/A
Car Audio Rear Speakers Location: N/A
Left Rear Speaker Positive Wire (+): Blue/Black
Left Rear Speaker Negative Wire (-): Yellow/Brown
Right Rear Speaker Positive Wire (+): Blue/Violet
Right Rear Speaker Negative Wire (-): Blue/Brown

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

the first thing i would do is check the speaker connectors make sure the two wires are not touching that will short out the speaker drivers in a good quality radio,

How to set up radio without wiring diagram : First you need to hook up the lead and ground power wire to your radio.(the lead usually has a line all the way down it). Turn power on to the radio and switch to am/fm. Locate any lead speaker wire and connect it to front right -. Then take all ground speaker wires one by one and touch them to front right +. As soon as you hear a sound, find out which speaker it is coming from, as soon as you have identified correct speaker remove wires from right speaker and mark them carefully. Do this with the rest of speaker lead wires an speaker ground wires and you will be able to connect your stereo.

if u have a factory amp u need to hook it to the remote wire or power antt