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Home >> Mercury >> 2005 >> Montego Base, FWD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Anti-Theft Systems >> Anti-Theft System -- Pats >> General Procedures >> Spare Key Programming >> Disabling Unlimited Key Mode
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Disabling Unlimited Key Mode

NOTE: By disabling the unlimited key mode with a random 8-digit number the previous access code no longer operates the vehicle.
  1. Using a diagnostic tool, select PCM from the menu. Select SECURITY ACCESS to obtain security access. For additional information, refer to ANTI-THEFT SECURITY ACCESS .
  2. Select: DISABLE UNLIMITED KEY MODE.
  3. Select: PROGRAM UNLIMITED TRANSPONDER SECURITY KEY.
  4. Enter an 8-digit random number (not 00000000 or 00000001).
  5. Select: IGNITION KEY CODE ERASE.
  6. Disconnect the diagnostic tool and turn the ignition key to OFF.
  7. Program 2 keys to enable the vehicle.
  8. Program any additional keys using either Key Programming Using Two Programmed Keys  or Key Programming Using Diagnostic Equipment .
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