How to Change the Keyless Entry Code on a 2005 Mercury Mariner

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You can program custom keyless entry codes for the 2005 Mercury Mariner. These codes are used to enter the vehicle using the door keypad. The Mariner comes with a permanent factory code which is printed on a small card in your original documents. You cannot change this code. You can, however, change the personal code that you have previously programmed for the Mariner. The first step is to erase the old personal code; then you can program the new one.

  • Locate the keypad for the keyless entry system in the Mariner's driver's side door. Input your Mariner's permanent factory code using the buttons on the keypad.

  • Push the "1/2" button on the keypad. Then push and hold down the "1/2" button for two seconds. This will erase your previous personal code. Wait five seconds for the system to exit the programming mode.

  • Input the permanent factory code into the keypad.

  • Push and release the "1/2" button on the keypad.

  • Input the new personal code onto the keypad, pressing each button within five seconds to ensure the code is accepted. The Mariner's doors will lock and unlock, indicating that the new code has been saved.

Tips & Warnings

  • If you do not know the factory code for your vehicle, visit your nearest Mercury dealer for assistance. The service department will be able to retrieve it for you.

References

  • "2005 Mercury Mariner Manual"; Ford Motor Company; 2004
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