I have jensen JR remote control

One of these should work:
0463, 0000, 0067, 0209, 0041, 0479, 0271

I found the codes in this page http://remotefinder.rca.com/

Codes for Jer 321, Jer 323 and Jer 422.

To introduce it to your universal control Jer 323:
1. Press the device button you need (for example, TV)
2. Press the input key and keep pressing it while introducing your code (for example, Sony Tv: "Input+1218")

In the JR-300 manual, only code listed for Sony TV is 0000.

Here's the link to the codes:
http://www.remotecentral.com/features/r-jr300.htm

Here is a link to a site that has the instructions and codes for a jr 300 which works the same as a JR400. How do I know? I had the same problem as you and this is how I solved it. Good luck!
http://www.remotecentral.com/features/r-jr300.htm

i lost my code for tv its a toshiba please help!!!

I'm not sure if your remote will operate the vizio TV. You can try a code search and see if that works because the vizio TV is not listed.
Here is the user's manual.

I am not 100% positive that the JR-321 is supported in the 300 series but.

Jensen JR300 manual - If you cant get it to work using one of these codes it does not support your unit.

http://157.254.235.130/public/IBJ34500SE.pdf

or

http://157.254.235.130/public/J3_4_500_MANUAL_S_E.pdf

Hope that helps!

http://www.remotecodelist.com/remotes/jensen/JR300C.pdf

You actually do not require the number to program this remote. If you hold down the component you are wanting to link it to eg. TV and press the power button for 3 seconds the on/off button will stay lit. Once the on/off button is lit, you then just press the on/off button until the unit turns off. You then press the stop button at the bottom. You should be able to turn your TV on now!