I just noticed this today while sitting in my car. My speedometer needle twitches every 2 minutes. The car is off. No key in the ignition.

whats happening and is this drawing power? I already have the parasitic draw from the damn malfunctioned HFL.

 

Have you tried disconnecting your car battery for 5 minutes and then reharnessing it? I read in a different car forum that this worked for his BMW. Not sure if it'll do the same for our TL but it's worth a shot.

 

^ if you do this, remember to make sure you have nav and radio codes

 

I'm having the exact same problem. Did you ever find a solution?

 

Does the click come from the speedo itself or is it a relay?

I would at least unplug the bad HFL unit and see what happens. It looks like most of these stop doing this when the door is opened which if I remember right turns the HFL off when you're on a phone call. It could be HFL rebooting or whatever it is that it does while it's sitting there draining the battery while you're away.

 

my 02 CLS does it as well under certain conditions, car has been doing it for the 9 years I have had it