Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSMERCURY2010MOUNTAINEER 2WD V6-4.0LREPAIR AND DIAGNOSISBODY AND FRAMELOCKSKEYLESS ENTRYKEYLESS ENTRY TRANSMITTERTESTING AND INSPECTIONPROGRAMMINGAUTOLOCK AND AUTO-UNLOCK PROGRAMMING
2010 Mercury Mountaineer 2WD V6-4.0L
Autolock and Auto-Unlock Programming
2010 Mercury Mountaineer 2WD V6-4.0LSECTION Autolock and Auto-Unlock Programming
Autolock and Auto-Unlock Programming
Autolock Programming Using the Keyless Entry Keypad
1. Close all doors and windows.
2. Confirm that the ignition key is OFF.
3. Enter the 5-digit permanent entry code into the keyless entry keypad.
4. Within 5 seconds of entering the code, press and hold the 3/4 button on the keyless entry keypad.
5. Within 5 seconds of Step 3, and while holding the 3/4 button, press the 7/8 button on the keyless entry keypad and release it.
6. NOTE: If the autolock is disabled, the horn chirps once. If the autolock feature is enabled, the horn chirps once shortly and then sounds a second time with a longer sound of the horn once the above sequence is completed.
Within 5 seconds of Step 3, release the 3/4 button on the keyless entry keypad.
Autolock Programming Using the Ignition Lock Cylinder
1. Close all doors and windows.
2. Confirm that the ignition key is OFF.
3. NOTE: Steps 5 through 9 must be carried out within 30 seconds.
Turn the ignition key from OFF to RUN.
4. Press the door lock control switch UNLOCK button 3 times.
5. Turn the ignition key from RUN to OFF.
6. Press the door lock control switch UNLOCK button 3 times.
7. Turn the ignition key from OFF to RUN.
8. Verify the horn chirps. This indicates the enable/disable mode and now is ready to accept program changes.
9. Press the door lock control switch UNLOCK button then the LOCK button 1 time to command the module to toggle the autolock/relock feature.
10. Verify that the horn chirps. There should be 1 chirp indicating that autolock/relock feature has been disabled. If 1 chirp is heard, followed by a longer sound of the horn, the autolock/relock feature has just been enabled.
11. Turn the key to the OFF position or wait 2 minutes to exit the enable/disable mode.
12. Verify that the horn chirps once to indicate that a feature has been changed and that autolock/relock has been toggled.
Auto-Unlock Programming Using the Keyless Entry Keypad
1. Close all doors and windows.
2. Confirm that the ignition key is OFF.
3. Enter the 5-digit permanent entry code into the keyless entry keypad.
4. Within 5 seconds of entering the code, press and hold the 3/4 button on the keyless entry keypad.
5. Within 5 seconds of Step 3, and while holding the 3/4 button, press the 7/8 button twice on the keyless entry keypad and release it.
6. NOTE: If the auto-unlock is disabled, the horn chirps once. If the auto-unlock feature is enabled, the horn chirps twice.
Within 5 seconds of Step 3, release the 3/4 button on the keyless entry keypad.
Auto-Unlock Programming Using the Ignition Lock Cylinder
1. Close all doors and windows.
2. Confirm that the ignition key is OFF.
3. NOTE: Steps 5 through 9 must be carried out within 30 seconds.
Turn the ignition key from OFF to RUN.
4. Press the door lock control switch UNLOCK button 3 times.
5. Turn the ignition key from RUN to OFF.
6. Press the door lock control switch UNLOCK button 3 times.
7. Turn the ignition key from OFF to RUN.
8. Verify the horn chirps. This indicates the enable/disable mode and now is ready to accept program changes.
9. Press the door lock control switch LOCK button then the UNLOCK button 1 time to command the module to toggle the auto-unlock feature.
10. Verify that the horn chirps. There should be 1 chirp indicating that auto-unlock feature has been disabled. If 1 chirp is heard, followed by a longer sound of the horn, the auto-unlock feature has just been enabled.
11. Turn the key to the OFF position or wait 2 minutes to exit the enable/disable mode.
12. Verify that the horn chirps once to indicate that a feature has been changed and that auto-unlock has been toggled.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.