Sc400

[tracey nelson]

My 1992 SC400 has no volume coming out of the speakers but it has power to the radio, CD player and antenia. Anyone have an idea?

[UCF3]

Man that just happened to me as well. If you can wait, I'll have some troubleshooting tips posted. I would suggest getting a good multi-metre tester.

[tracey nelson]

Thank you! I did check both fuses but I have not pulled out a speaker to see if the wire is hot.

[SPORTcoupe300]

I've heard people tell amazing stories of both speakers blowing at the same time.

I don't believe a word of it but thought I'd give you some useless info. :D

Once you've got it taken apart, the easiest way to test a speaker is to connect the 2 wires to a 9V battery.

It should make a thump. If it doesn't, the coil is blown.

Otherwise, there should be about 3V in the wires coming to the speaker when the system is turned up moderately.

If there isn't....trace it from there.

Good luck.

[jimbostar]

I have the same problem, someone mentioned to check the wires going to the amp for corrosion, it's in the trunk under the CD player. I'm going to do this tonight and I'll let you know...

[UCF3]

thanks. Sorry, haven't been able to get to it yet. I'm going to start from the Radio Head Unit, and test every wire (except Negative).

I have my doubts if the amp is to blame. Since i lost my sound from all speakers, I have to beleive the head unit may have something to do with it.

[Lex Luthor]

Also, simple as it is...if you've got the factory phone it's possible to have the phone on which will kill sound to all but one spkr, a few ppl have had this happen and thought it was the amp. As for corrosion on the wires to the amp, that area is sealed pretty well, that shouldn't occur unless the car has been hit back there and repaired without maintaining the integrity of the seals where the body glue lays at the joints. If that's the problem you'll know as soon as you get in there, as for the amp, these are pretty robust (unless it gets wet), they seldom fail but it happens. It's possible to blow the oe paper cone 4" spkrs, but all at once isn't too likely and would have to be from a large aftermarket amp.

[jimbostar]

Lex, is there any way to bypass the factory phone '1-speaker on' feature?

[tracey nelson]

I do have the factory phone but none of my speakers are working. I have an extra lexus amp that I may try. I'm close to just taking it to best buy and pay for a new head and let them figure it out.

[UCF3]

Tracey Nelson:

Do me a favour. Turn your stereo on and crank it to maximum. My speakers are working, but something maybe wrong with head unit or the wires.

BTW: My SC was in an accident before, and the morons who fixed it scotchtaped it together. I would appreciate it if someone with a 95 SC3 would write down the wire pattern(colours) to the connectors-to the head unit.

Thanks a lot in advance.

[tracey nelson]

I have power at the amp but none of the wires at the speakers are hot. I have an extra factor amp and tried to hook it up but same thing.

[Lexual]

http://www.carstereohelp.com/repairDoItYou...usRepairVol.htm

have you been here yet??

[tracey nelson]

Thank you for the site link. When the wife gets home I'll pull the back seat out and try this and see if it helps.

[OKSC3]

I'm going to start from the Radio Head Unit, and test every wire (except Negative).

You should check ohms check negative to the chassis. Current flows from negative to positive, so if your having grounding problems you get no powa!