1997 Toyota 4Runner Owners Manual - Page 115

Changing the security code 1. Turn off the audio system. Turn the ignition key to "ACC". Simultaneously push and hold in "1", "6", and "PWR/VOL" until "SEC" appears in the display. 2. While you are holding in the "∧" side of "TUNE" push "1". The display will read "-". On some models, " B" and "Y" will also turn on. 3. Input the existing three-digit code. You have 10 seconds to enter each digit. For example, "209": To set the first digit: Push "1" until the digit you want appears on the display. To set the second digit: Push "2" until the digit you want appears on the display. To set the third digit: Push "3" until the digit you want appears on the display. 114