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 MANUALSMERCURY2010MARINER HYBRID, AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1345 (ANTI-THEFT SYSTEM - PASSIVE ANTI-THEFT SYSTEM (PATS))GENERAL PROCEDURESSPARE KEY PROGRAMMING - UNLIMITED KEY MODEDISABLING UNLIMITED KEY MODE
2010 Mercury Mariner Hybrid, AWD
Disabling Unlimited Key Mode
2010 Mercury Mariner Hybrid, AWDSECTION Disabling Unlimited Key Mode
WARNING: This page is about a different car, the 2010 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
By disabling the unlimited key mode, the previous access code no longer operates the vehicle.
- From the scan tool, enter TOOLBOX. Select BODY-SECURITY-PATS Functions and follow the on-screen instructions to ENTER SECURITY ACCESS. This procedure takes approximately 10 minutes to carry out, during which time the ignition key must be in the ON position and the scan tool must be connected to the vehicle. For additional information, refer to Anti-Theft Security Access .
- Select: "unlimited key mode OFF" and press the tick mark.
- Select: "Ignition Key Code Erase" and press the tick mark.
- Disconnect the scan tool and turn the ignition switch to the OFF position (the key does not need to be removed at this time).
- Turn the first PATS key in the ignition lock cylinder to the ON position for 3 seconds.
- Turn the first PATS key to the OFF position and remove the key from the ignition lock cylinder.
- Insert the second PATS key into the ignition lock cylinder and turn the key to the ON position for 3 seconds.
- If it is desired to program additional key(s), refer to Key Programming Using Two Programmed Keys for each additional key (up to 8 keys, total) that needs to be programmed. The PCM SPAREKEY PID must be enabled.
NOTE:
With the unlimited key mode turned off, a maximum of 8 keys can be programmed into the PCM using the Key Programming Using Two Programmed Keys procedure. The PCM SPAREKEY PID must be enabled.
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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.