I have a JVC KS-FX621 cassette receive in my car. I want to connect my mobile phone which has a 3.5 mm jack to this JVC stereo to listen to the music along with able to control the music through the car stereo. How can it be done? Currently, I am using a cable which has a 3.5mm jack on one side and the other end has two mono knobs which are connected to the stereo's line out terminals. This setup provides me the sound output in my car speakers but the volume can only be changed through the mobile phone only.

SOURCE: setting clock

Try this (it is from the instructions for a similar model): The URL for this manual is: http://books.jvcservice.com/download/685823823/19755.pdf

SOURCE: Using an external mp3 player on my JVC KD-LX111

You could try using an FM transmitter which plugs into the earphone jack on your Mp3 player, then all you have to do is tune the radio to pick up the transmitters frequency.

SOURCE: No output from speakers in car.

Sounds like a couple speakerwires could be crossed/shortcurciting somewhere...;)

SOURCE: I don't know how to connect the wires from my JVC car stereo

Radio wire colors:
P o w e r Memory (+12v Constant) Yellow Ignition (+12v Switched) Red Ground (-) Black Dimmer Pink/White (Alpine only) Power Antenna Blue Amplifier Turn-on Blue/White Phone Mute Light Blue (Sony only) S p e a k e r s Right Front (+) Gray Right Front (-) Gray/Black Left Front (+) White Left Front (-) White/Black Right Rear (+) Violet Right Rear (-) Violet/Black Left Rear (+) Green Left Rear (-) Green/Black

1991 Oldsmobile Cutlass Supreme Car Stereo Wire Diagram
Car Radio Battery Constant 12v+ Wire: Orange
Car Radio Accessory Switched 12v+ Wire: Yellow
Car Radio Ground Wire: Black
Car Radio Illumination Wire: Gray
Car Stereo Dimmer Wire: Brown
Car Stereo Antenna Trigger Wire: Pink
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: N/A
Car Audio Front Speakers Size: 4′
Car Audio Front Speakers Location: Dash
Left Front Speaker Positive Wire (+): Tan
Left Front Speaker Negative Wire (-): Gray
Right Front Speaker Positive Wire (+): Light Green
Right Front Speaker Negative Wire (-): Dark Green
Car Audio Rear Speakers Size: 6′ x 9′
Car Audio Rear Speakers Location: Rear Deck
Left Rear Speaker Positive Wire (+): Brown
Left Rear Speaker Negative Wire (-): Yellow
Right Rear Speaker Positive Wire (+): Dark Blue
Right Rear Speaker Negative Wire (-): Light Blue
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SOURCE: how do you set the

To set the clock please click on the link below then go to page 15.

http://a248.e.akamai.net/pix.crutchfield.com/Manuals/257/257KSFX490.PDF

Good Luck