Toyota Celica 1997 Owner's Manual page 94

Cleaning 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 on
the display.
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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.
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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.