Ok, I had removed negtive battery cable disconnected for couple days waiting Coil pacs. So pacs are in, everything buttoned up, take the car for a spin to make sure all is normal. Look at the clock to determine time,because I don't work on the car with a watch on, it says 6:05 pm. Then I remember that battery was disconnected so time can't be correct. Few minutes pass, look at the clock again, it shows 4:35 pm. So I'm thinking what's that all about. Car's running fine, no codes, go home, put the car in the garage, look at wall clock to compare to dash clock and the time is correct at about 4:45. So the car sets it's own clock after a battery disconnect ? Where is that in the owners manual ?

 

Just a wild guess here but I assume you have navigation?
If yes, then the GPS is triangulating to figure out where you are and automatically sets the clock based on your time zone.

 

I know it does not adjust automatically with daylight savings time...

 

This sounds right. I just swapped my gauge face. The clock adjusted itself after the cluster was reconnected.

 

Mine can't even keep time let alone reset itself.

Matt

 

Has nav but was unaware it would set the clock. Have had more than one car with nav and none of them ever set the clock for me. Good to know that clock is always correct. But still have to reset for DST.

 

You do have to reset for DST, but it is a simple process, at least on the 997.2. I think it was this way on my 997.1 also. You have go into the PCM settings and select or deselect, whichever is appropriate, the DST button. Very simple. No need to actually manually adjust the hours and minutes.

 

It's actually easier and faster and accomplishes the same task by just using the adjust button on the dash - push and hold until the hour number flashes, twist **** once to the right for DST or once to the left for ST - you're done. I find navigating the PCM menus to be tedious.

 

LMAO Thanks Matt, I needed that.

 

Thats one of the most annoying aspects.. that the GPS system can tell you where you are and the care cannot auto-adjust for summer time / daylight savings time.

All the car needs is a shortwave antenna to receive the atomic clock info on in/out of summer time, and it could adjust itself that way as well (like my watch and some house clocks do since at lest the 1980's)