Alarm And Keypad Code

I have 1991 nissan maxima gxe but when i bought it the person didn't have the alarm or keypad code. Does anyone know how i'm able to get a remote for the security system and also how can i find out the keypad code?

I just sold my 91 Maxima, the code for the alarm system and key pad is on the control box, which is mounted in the passenger kick panel. As I remember it is a seven digit number that you enter. You always have to push the left most button on the key pad (the C key) before inputting any numbers. Your owners Manual will tell you how you can reset the code after entering the number off that control box.
Good Luck! I really liked the key pad feature, and used it all the time.

what happens if you dont have the manual????