It's probably to make sure that all the electrical components are all completely discharged. Ensures a fresh reboot of the SYNC system and software. Probably overkill but I'd do it anyway.
Just curious, and I know it's probably a silly question, but with the disconnection of the battery, is it the positive connection or the negative? Also, do you start the car first so it is running when you disconnect? And I seem to remember another post where they said the headlights need to be "on" too...I had the exact same problem with the GPS in my 2015 MKC and here is what I previously posted in case you missed it:
Here is what I did and it worked quickly and immediately and has been working since: I disconnected the battery for 15 minutes per instructions in this forum, and after reconnecting the battery, everything seems to be working as new (actually better than new, as even when new the red icon was always off to one side of the road). I will continue to check the operation and if any changes, will advise on this forum. By handling this myself I saved a half-hour drive each way to the dealer, time to leave and pick up and return a lender, or having my wife give me a ride to work while car is being serviced. Also eliminated was the dreaded "Cannot duplicate" report sometimes given to us when having a car serviced.
I would try this for sure before wasting time with the dealership, as it will probably work for you.
The hardest part of the job was removing the battery cover and even harder was getting the cover back on. Luckily I did this during the day outside, rather than my usual midnight mechanical work in the garage in dim light.
I know that many Lincoln owners will not want to do this, so my suggestion is to take it to the dealer with a printout of this post and ask them to give this a try. Computers are really touchy, but sometimes even with a home computer that is acting up, the answer is to power it down and then restart. In effect by disconnecting the battery you are powering down the GPS computer.
My wife has a 2014 MKZ with a similar GPS as my 2015 MKC and no issues of any kind with the MKZ.
Why does it say files can be obtained at the link,when you clearly cant?Gerry I looked at the paper work and I they actually fixed it with the following TSB. It worked fine after. I think they didn't actually do a master reset as all of our favorites were still there, and generally they are lost with the master reset. A few C-Maxers had no resolution of the problem with the TSB and they had new GPS Modules installed. But here is the TSB that worked for us. 14-0037
GLOBAL POSITIONING SATELLITE MODULE (GPSM) - NAVIGATION DISPLAY OFFSET OR INCORRECT POSITION BUILT ON OR BEFORE 1/6/2014
Publication Date: February 21, 2014
FORD: 2013 Fiesta, 2013-2014: C-MAX, Focus, Fusion, Mustang, Taurus
LINCOLN: 2013-2014 MKS, MKZ
FORD: 2013-2014 E-Series, Edge, Escape, Expedition, Explorer, F-Super Duty, Flex
LINCOLN: 2013-2014 MKT, MKX, Navigator
Some 2013-2014 vehicles equipped with SYNC® and/or MyFord Touch®, MyLincoln Touch® and built on or before 1/6/2014 may exhibit navigation display offset or incorrect position. The last known vehicle location may be displayed instead of current location, or the vehicle location may be displayed as off road from the current vehicle position.
Reprogram the GPSM to the latest calibration using IDS release 89.02 or higher. Calibration files may also be obtained at www.motorcraft.com.
OPERATION DESCRIPTION TIME
140037A Reprogram The GPSM Following The Service Procedure (Do Not Use With Any Other Labor Operations) 0.3 Hr.
Eligible Under Provisions Of New Vehicle Limited Warranty Coverage.
Warranty/ESP coverage limits/policies/prior approvals are not altered by a TSB. Warranty/ESP coverage limits are determined by the identified causal part and verified using the OASIS part coverage tool.
BASIC PART NO. CONDITION CODE 10E893 04
Last edited by DanMc85; 04-03-2014 at 08:08 PM.