Exactly - not only can all modern cars remotely be accessed, anyone with access to those [insecure] maintenance pages could hypothetically:

• Track you on the GPS
• List your regular journeys
• Use the cameras to see who is in the car right now
• Wait for you to pass a certain remote area on one of your regular journeys
• Disable the car
• Unlock the doors
• Turn on the interior light

At that point, I wonder what access the car has to affect whether the driver’s phone can make a call…