Hello, new here . I have a new to me 1993 T100 SR5 and when my battery died recently my radio went into security mode. Asked 90 yr old gentleman that sold it to me and he can’t remember the code. He’s suffering from Alzheimer’s so he not the right person to ask. I have tried some 3 digit codes like 000, 999 and even his birthday. I have been to dealer but they have no clue if there’s a universal code. I’m on my last try for entering codes. Can anyone help. I don’t want to hear the code is on back of radio or was inside manual, that wouldn’t have been very secure.