Mercury Grand Marquis 2004-2011 Key Programming Procedure
The following are the key programming procedures for the year Mercury Grand Marquis 2004, 2005, 2006, 2007, 2008, 2009, 2010 and 2011.
ADD KEY (Must have two working original keys):
1. Insert the first previously programmed coded keys into the ignition.
2. Turn the ignition from the 1 (LOCK) position to the 3 (RUN) position. Keep the ignition in the 3 (RUN) position for at least 3 seconds, but no more than 10 seconds.
3. Turn the ignition to the 1 (LOCK) position and remove the first coded key from the ignition.
4. Within 10 seconds of turning the ignition to the 1 (LOCK) position, insert the second previously coded key into the ignition.
5. Turn the ignition from the 1 (LOCK) position to the 3 (RUN) position. Keep the ignition in the 3 (RUN) position for at least 3 seconds, but no more than 10 seconds.
6. Turn the ignition to the 1 (LOCK) position and remove the second coded key from the ignition.
7. Within 20 seconds of turning the ignition to the 1 (LOCK) position and removing the previously programmed coded key, insert the new un-programmed key (new key/valet key) into the ignition.
8. Turn the ignition from the 1 (LOCK) position to the 3 (RUN) position. Keep the ignition in the 3(RUN) position for at least 6 seconds.
9. Remove the newly programmed coded key from the ignition.
If the key has been successfully programmed, it will start the vehicle’s engine and will operate the remote entry system (if the new key is an Integrated Keyhead Transmitter). The theft indicator light will illuminate for 3 seconds and then go out to indicate successful programming.
If the key was not successfully programmed, it will not start your vehicle’s engine and/or will not operate the remote entry features. The theft indicator light may flash on and off. Wait 20 seconds and you may repeat Steps 1 through 8. If the failure repeats, bring your vehicle to your authorized dealer to have the new key(s) programmed.
To program additional new un-programmed key(s), wait 20 seconds and then repeat this procedure from Step 1.
About Mercury Grand Marquis
With the 2003 model year, the Grand Marquis received a considerable facelift, and the Ford Panther chassis was completely redesigned for the first time since its introduction in 1979. While Mercury continued to produce full-size sedans throughout the 2000s, two new models were introduced: the 2003-2004 Mercury Marauder and the 2005-2007 Mercury Montego (rebranded the 2008-2009 Mercury Sable). Additionally, following the demise of the Ford Crown Victoria for the 2008 model year, the Grand Marquis has basically replaced the CV in the retail market. As a result of this, the style of the fourth-generation Grand Marquis was influenced by the more generic appearance of the third-generation Crown Victoria, allowing aspects of both vehicles to be combined into a single model that would appeal to all market sectors.
The Grand Marquis marked its 35th year of production in 2010, overtaking the Cougar as the Mercury brand’s longest-running nameplate by a year. It wasn’t until September 2010 that the final copies for retail sale were completed after a brief production run. A component shortfall at the St. Thomas, Ontario factory has forced the company to delay the end of production of fleet vehicles, which was originally slated to end in December 2010. Ford’s penultimate Mercury, the Grand Marquis, was built at St. Thomas on January 4, 2011, marking the end of the company’s Mercury production.
While the aesthetic changes to the 2003 Grand Marquis were evolutionary, the Panther platform saw significantly more significant improvements. To increase chassis rigidity, an entirely new frame with fully boxed and hydroformed frame rails was adopted. To enhance handling, the front and rear suspensions, as well as the brakes, were changed. A quiet EBD brake booster was fitted, as well as a mechanical panic help system. The new suspension modifications necessitated the use of wheels with a large positive offset. Rack and pinion steering was installed in favor of the previous recirculating ball system to improve steering precision and save expenses. The rear axle ratio was 2.73:1 in normal Grand Marquis models; 3.27:1 in LSE and handling suspension models. On LS-trim export vehicles, the handling package was standard equipment.