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View Full Version : HU wont turn on. Ideas?



Supergumby5000
05-05-2008, 05:23 PM
Whelp, last night i installed a used HU and it would turn on, but there would be no output from the speakers. I turned the car off, turned it back on about 5 minutes later, and now the HU wouldnt even turn on.

So, i went out and bought a BNIB HU and wired that up, and it wont turn on either.

I checked the radio fuse in the fusebox and its still good. HU fuse is good.

Im using stock power, ground, and speaker wire.

Any ideas? This is my sisters car and im leaving the state tomorrow, so time is of the essence.

Supergumby5000
05-05-2008, 05:28 PM
are there fuses anywhere else i should check or something? i have no idea what else to check lol.

Supergumby5000
05-05-2008, 05:43 PM
remote, power, ground, and ignition wires are all crimped to stock connections.

Radio fuse is good in the fuse box under the dash


bump :crap:

thaster
05-05-2008, 05:48 PM
check fuse under hood. My car have a fuse that says radio #1 which is under the hood, and radio #2 which is under neath the steering wheel

squeak12
05-05-2008, 05:48 PM
The only thing I know of...when Ive put in new cd players, I always had to push the power button to turn it on the first time. Other than that, check the wires in the harness with a dmm and make sure they are getting power.

Supergumby5000
05-05-2008, 05:51 PM
The only thing I know of...when Ive put in new cd players, I always had to push the power button to turn it on the first time. Other than that, check the wires in the harness with a dmm and make sure they are getting power.

i thought about that, but how would i do that with the harness? i did the beep test with a DMM on the one fus e( ill try to find an under-the-hood one), do i just put one end of the DMM on ground and then beep test the rest of the wires?

Supergumby5000
05-05-2008, 05:53 PM
check fuse under hood. My car have a fuse that says radio #1 which is under the hood, and radio #2 which is under neath the steering wheel

the fusebox under the hood had no radio fuse :(

any other ideas?

thaster
05-05-2008, 05:53 PM
test your constant 12 v/battery wire and your ignition/acc wire. The battery wire should always be a constant 12 v even though the car is not turn on while the ignition should read 12 v when the ignition is on. Probe the wire and ground it

hazardous0388
05-05-2008, 05:56 PM
check the constant, with the + of the dmm and ground the other - end of the dmm and it should read 12v. then on the switch wire put the + on it and put the - on a ground, and the switch wire should read 12 v when the power is on in the car. Make sure you check with a metal ground, not the ground wire, hence it could be the ground wire is bad, probably not but always a possibility.

mokedaddy
05-05-2008, 06:03 PM
The fuse under the hood usually is not listed to as a radio fuse. Its usually on an ignition circuit of some kind.

You have a dmm. First check power at the yellow and red wires at the harness with the key on. If you are getting power at the red wire but not the yellow than most likely the fuse will be under the hood.

The beeping test you are talking about is a continuity test. You hold a lead on each side of the fuse and if it beeps the fuse is good.

Supergumby5000
05-05-2008, 06:07 PM
w/ + on battery constant and - on ground, i got nothing, like .04volts

w/ + on battery constant and - on ground, i got -12.6 volts

where does this get me? lol

Supergumby5000
05-05-2008, 06:09 PM
The fuse under the hood usually is not listed to as a radio fuse. Its usually on an ignition circuit of some kind.

You have a dmm. First check power at the yellow and red wires at the harness with the key on. If you are getting power at the red wire but not the yellow than most likely the fuse will be under the hood.

The beeping test you are talking about is a continuity test. You hold a lead on each side of the fuse and if it beeps the fuse is good.

with the battery constant and ground, i would get a quick beep, for about 1/16th of a second, but thats it.... it wouldnt continuously beep, like if you were to just touch the pos and neg terminals on the DMM together.

thaster
05-05-2008, 06:09 PM
w/ + on battery constant and - on ground, i got nothing, like .04volts

w/ + on battery constant and - on ground, i got -12.6 volts

where does this get me? lol

wait -12v with car turn on? wth......

Supergumby5000
05-05-2008, 06:10 PM
wait -12v with car turn on? wth......

with car on accessory mode. Ill go retest with the car fully on

mokedaddy
05-05-2008, 06:11 PM
w/ + on battery constant and - on ground, i got nothing, like .04volts

w/ + on battery constant and - on ground, i got -12.6 volts

where does this get me? lol


Which wires are you testing and which got which results?

mokedaddy
05-05-2008, 06:12 PM
wait -12v with car turn on? wth......

That just means the leads were reversed. No harm done.

Supergumby5000
05-05-2008, 06:13 PM
Which wires are you testing and which got which results?

okay, DMM + on the battery constant wire, and DMM - on the ground, i got .04 volts (nothing)

DMM + on the battery contstant wire, and DMM - on the ignition wire (red), i get -12.6 volts

with the car totally on (not on accessory), i get the same results, accept with the ignition wire, it reads -14v instead of -12.6

thaster
05-05-2008, 06:16 PM
okay, DMM + on the battery constant wire, and DMM - on the ground, i got .04 volts (nothing)

DMM + on the battery contstant wire, and DMM - on the ignition wire (red), i get -12.6 volts

with the car totally on (not on accessory), i get the same results, accept with the ignition wire, it reads -14v instead of -12.6

sound like there's something wrong with your battery constant/yellow wire. is that yellow wire fused btw? also i think you suppose to ground the wire not probe it to the ignition wire.

mokedaddy
05-05-2008, 06:20 PM
okay, DMM + on the battery constant wire, and DMM - on the ground, i got .04 volts (nothing)

DMM + on the battery contstant wire, and DMM - on the ignition wire (red), i get -12.6 volts

with the car totally on (not on accessory), i get the same results, accept with the ignition wire, it reads -14v instead of -12.6

Yeah you dont ground the lead to the accessory wire. That is why its reading negative volts. Your constant wire has a blown fuse. That is usually underneath the hood but not always.

Do the continuity test on both sides of all the fuses. underhood first than inside if you dont find one that is blown.

What kind of car is it?

Supergumby5000
05-05-2008, 06:27 PM
Yeah you dont ground the lead to the accessory wire. That is why its reading negative volts. Your constant wire has a blown fuse. That is usually underneath the hood but not always.

Do the continuity test on both sides of all the fuses. underhood first than inside if you dont find one that is blown.

What kind of car is it?

Grounding out to frame with the DMM -, i get 14volts on the ignition wire and nothing on the constant wire, so as you said its a bad fuse on the constant wire?

I check the radio fuse under the dash with continuity test and it read fine. Im not sure what fuse to look for underneath the hood though, none of their names ressembled anything to do with the radio...

Supergumby5000
05-05-2008, 06:28 PM
oh, and a 2000 ford escort ZX2

mokedaddy
05-05-2008, 06:29 PM
Grounding out to frame with the DMM -, i get 14volts on the ignition wire and nothing on the constant wire, so as you said its a bad fuse on the constant wire?

I check the radio fuse under the dash with continuity test and it read fine. Im not sure what fuse to look for underneath the hood though, none of their names ressembled anything to do with the radio...

Yes bad constant fuse. I am not sure what it is going to be under either so just test them all until you find it. :)

Its not hard nor does it really take long.

thaster
05-05-2008, 06:37 PM
just look if the fuse is bad. you dont really have to test them with a DMM. the middle of the fuse shouldnt be connected if it were bad. Also maybe you could tap into another constant 12v wire in your car.

mokedaddy
05-05-2008, 06:39 PM
just look if the fuse is bad. you dont really have to test them with a DMM. the middle of the fuse shouldnt be connected if it were bad. Also maybe you could tap into another constant 12v wire in your car.

Often times you cant see the insides when they are in the fuse box. You can pull them and look but if your car is on thats a good way to throw a CE light. Its not hard to test and do it right so why wouldnt you?

Supergumby5000
05-05-2008, 06:40 PM
found it! it was a fuse titled as "room". Easy find eh?

Thanks for the input everyone