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 188 (ANTI-THEFT SYSTEM -- PATS)GENERAL PROCEDURESSPARE KEY PROGRAMMINGENABLING UNLIMITED KEY MODE
2010 Mercury Mariner Hybrid, AWD
Enabling Unlimited Key Mode
2010 Mercury Mariner Hybrid, AWDSECTION Enabling Unlimited Key Mode
WARNING: This page is about a different car, the 2005 Mercury Montego, 2005 Ford Freestyle, and 2005 Ford Five Hundred. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Unlimited key mode is intended for use by those customers who need more than 8 keys for their vehicle.
- The customer must choose an 8-digit, non-00000000 or 00000001 number to be programmed to all of their vehicles. All customer vehicles need to use the same number. Valid digits are 0-9 plus the letters A-F.
- Check the PID: UNLIMITED TRANSPONDER KEY ID and compare its value against the code chosen in Step 1.
- Using the diagnostic tool, select PCM from the menu. Select SECURITY ACCESS to obtain security access. For additional information, refer to ANTI-THEFT SECURITY ACCESS .
- Once in security access, if the Unlimited Transponder Security Key PID is 00000000 or 00000001, select Active Command: SET UNLIMITED TRANSPONDER KEY. Enter the 8-digit code chosen by the customer.
- Select: ENABLE UNLIMITED KEY MODE.
- Select: IGNITION CODE ERASE.
- Disconnect the diagnostic tool and turn the ignition OFF.
- Program 2 ignition keys to enable the vehicle.
- Program any additional keys using either Key Programming Using Two Programmed Keys or Key Programming Using Diagnostic Equipment .
NOTE:
If the PID: UNLIMITED TRANSPONDER KEY ID is not available, unlimited key mode is turned ON, and must be turned off before viewing the stored code. At this time, unlimited keys may be programmed to the vehicle. To view/change the stored code, follow the procedure for turning off unlimited key mode below.
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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.