I am sorry for my bad english. I was just trying to bypass the volume control but not sure which wires should I join. I will post pictures of wires.

This was the remote control but it got broken and I cut out the wires.

This is the wire that comes from the sound system. It has 5 cables. Red, yellow, white, blue and grounding cable.

This is the 3.5mm jack cable I have.
When I wire red to red, white to white, and ground to ground, no sound comes from the system. But when I wire the yellow cable to either the red or white cable, sound comes, but it only comes from one speaker. It changes depending on which cable I wire it to. If I wire it to the white cable, only the right speaker works; if I wire it to the red cable, only the left speaker works. When I wire the yellow cable to both the red and white cables, sound comes from both speakers, but the volume is too low and the sound quality is poor. When I wire the blue cable to any of the cables, no sound comes. Interestingly, when I cut the connection of the yellow wire, sound comes from both speakers, loud and clear, for just 1 second, but after that, no sound comes.

This was the remote control but it got broken and I cut out the wires.

This is the wire that comes from the sound system. It has 5 cables. Red, yellow, white, blue and grounding cable.

This is the 3.5mm jack cable I have.
When I wire red to red, white to white, and ground to ground, no sound comes from the system. But when I wire the yellow cable to either the red or white cable, sound comes, but it only comes from one speaker. It changes depending on which cable I wire it to. If I wire it to the white cable, only the right speaker works; if I wire it to the red cable, only the left speaker works. When I wire the yellow cable to both the red and white cables, sound comes from both speakers, but the volume is too low and the sound quality is poor. When I wire the blue cable to any of the cables, no sound comes. Interestingly, when I cut the connection of the yellow wire, sound comes from both speakers, loud and clear, for just 1 second, but after that, no sound comes.