LG Cell Phone Error Mode

I asked my wife yesterday afternoon why she didn't have her phone on, she said that it was on. I checked it, there was a message across the screen that I had never seen before, the words "Car Kit" was displayed. I could not call out or receive any calls, the phone wouldn't ring when called, but all menu items were available. At first I thought that she had switched into some odd mode by accident. After going through all setup menus it appeared that there was no "Car Kit" mode. I have not mentioned the model LG phone model number because this error can appear across several model LG phones. I went through the entire LG manual, no mention of car kit mode error anywhere. After doing a Google search I found out that this can be an indication the unit has been exposed to moisture. One person mentioned about the indicator decal under the contact end of the battery. It is black when new and turns purple when exposed to water. Both my wife's dead phone and my good phone were both purple indicating moisture exposure, could it be the Southern humidity? Using multiple suggestions found in the below links, I was able to get her phone back to a normal working mode. I tried a couple suggestions twice, so I can't say which one made the difference. I tried plugging and unplugging the charger cable several times, I cleaned the contacts at the charger connector with contact cleaner, an emery board and repeatedly dried it out with caned air. After performing all of those tries, using a metal nail file, I briefly shorted between a couple of contacts near the left side of the connector, she switched over the normal mode and now works good.