Battery Cable problems of the 2002 Chrysler Pt Cruiser

The electronic door locks on my 2002 Pt Cruiser limited started operating by themselves two years ago. I have had this car since it was new and had the multifunction turn signal switch replaced about 3 years ago. The door lock problem sometimes occurs when you are driving the car at low speed but it will also occur when the car is setting in the garage with the key out of the ignition. The doors will lock and unlock several times on their own while driving or without anyone being in the car or touching the remote keyless entry system. This can present problems if the car is locked and in a public parking lot. The care sometimes will unlock on its own. You can also be locked out of the car if you don't take your keys with you when exiting the car. This seems to happen more during hot summer weather than during cooler winter months. I have also noted that the external temperature gauge and compass mounted above the front window will also go out during hot weather. When the car cools down with the air conditioner on, the external temperature gauge will start operating again. I have taken the car to the dealer three times to be fixed. The first time they charged to diagnose the problem and said nothing was wrong, the second time they said the battery cable was corroded and need replaced at $300 and it needed a new battery. After this work, I drove it around the block and the door locks started going wild again. So I went back to the service manager and he said they would have to have the car for several days and they would get the district service manager on the phone to see if he might be able to help them. At that point we went into winter and it was ok. It is doing it again this spring so I will try again.

Had problems with my 02 Pt Cruiser not starting for 7 years and went on line and found others were having the same problem. Called chyrsler and told them they were going to fix and pay for problem. Service manager said he knew what the problems was and notice Chrysler was putting cheap parts on their vehicles. He upgraded the cables connecting to and from the battery and have not had this problem since. The cables were under volted and weren't able to charge the battery and I got stranded sometimes. Chrysler called dealer and had this work done at no expense to me. It's not the battery, alternator or the other connection I can't remember. It has been 3 months and I haven't had any problems since. Please let your service manager know that it is the low voltage battery cables to these areas. Having problems starting, hesitation starting or wouldn't start at all happen after not driving the car sometimes for 2 days just after bringing it back to the dealer.