Sony HCD-GX450 aux input?

May mechanical alignment is wrong . Its good to consult a service tech near to you.

If you wish to get some details; check the site linked here. Pull up older posts.
http://electro-medical.blogspot.com/

Apparently a mechanical issue. Can not tell you without looking at it. Sorry.

You may download a copy of the manual at https://docs.sony.com/release/MHCGX450.pdf

My Sony - Model : HCD-GX 470 . When i turn the power on it is on . Just 30 seconds it turns off itself . I do not know what is going on ? Please show me OR help me to fix it .

Check the speaker wires on the back for shorts, if okay! the problem is in the audio output ic's in the stereo.

"AUX" is a generic term for any Line Level analog input except PHONO. Look on the back.

Did you get a manual with it? According to the Sony site this speaker originates in Sony MHC-GX450.

"This product bundle includes the following models:
HCD-GX450 - STEREO MINI SYSTEM
RM-SC3 - REMOTE CONTROL for Shelf Mini Systems
SSRG444 - FRONT SPEAKER FOR MHCGX450
SS-WG450 - SUBWOOFER FOR MHCGX450"


Find the manual here and learn a bit about your seprated sub...

http://esupport.sony.com/US/perl/model-documents.pl?mdl=MHCGX450

See page 7.

As can be seen, the subwoofer has two connections to the mothership, very unlike the standard speaker level (+/-) speaker wire or RCA-Line-Level subwoofer out that 'normal passive or active subwoofers use, respectively.

Not knowing which of those your unspecified Pioneer receiver supports, it is impossible to say. Does your Pioneer have that control jack?

Mini-systems are generally not designed to be pieced out and used with grown-up gear. The absence of standardized connections is the clue.

Electronics have gone to heaven. Bury it and get a new one.

Make sure that Loudness switch is turned off & bass is not boasted up. Most cars have small cheap speakers that can't handle the bass. also its better to cut the low frequency from the woofer using a passive or active crossover. Most nowadays head units have got some sort of built in crossover. Refer to your head unit manual.

your speaker are hooked up wrong.or there may be dust in or on the terminals.i used a q-tip with rubbing alcohol and wiped them down.hook up the speaker cords properly and try this again.if this does not work then unplug the stereo and let it sit overnight and try again.