1997 Mercury Mountaineer Owner's Manual - Page 50
1997 Mercury Mountaineer Manual
Page 50 highlights
Controls and features presents them in a sequential order. Press the middle of the buttons (there is only one switch under each button). You can use either code to unlock your vehicle. If a second personal code is entered, the module will erase the old code in favor of the new code. If you wish to erase your personal code, use the following instructions: Erasing personal code 1. Enter factory-set code. 2. Press 1/2 within five seconds of Step 1. 3. Wait six seconds. The system will now only respond to the factory-set code. Unlocking the doors with the keyless entry system 1. Enter either factory-set code or personal code. Driver door will unlock and interior lamps will illuminate. 2. Press 3/4 button within five seconds of unlocking driver door. Passenger doors and liftgate will unlock. If five seconds expire, you must re-enter code, then press 3/4 button to unlock all doors. Locking doors with keyless entry system It is not necessary to enter the factory or personal code prior to 50