718 Coding using Launch X431 tool

[julianm]

You can't use GPS-sync unless you have a GPS antenna installed. Obviously you'd have one if you had Nav, but you may also have an antenna if your car was spec'd with Porsche Connect.

Yeah I saw this whole discussion in another thread. I'm fairly certain there's a GPS antenna that's being used with CarPlay. I suspect the antenna is there, but that the GPS-sync clock option is only present if Nav is enabled.

[Arne2]

I believe that CarPlay will use the phone GPS if the car lacks an antenna. So not conclusive.


Of course, you could try to activate on-board Nav using the AIO/SD card method. Then you'd know.

[julianm]

I believe that CarPlay will use the phone GPS if the car lacks an antenna. So not conclusive.

Yes, that's correct. For Wired CarPlay, the use (or existence) of an on-board GPS antenna is entirely optional / up to the car manufacturer. (For built-in Wireless CarPlay, on-board GPS antenna is required.)

Given GPS behavior I've seen, however, I have strong reason to suspect it's using the car's GPS antenna. In my particular vehicle, anyway.

[julianm]

Next up I'm trying to figure out if I can get the clock to synchronize time from GPS, even though I don't have the Nav option.

Ok got GPS time and verified. I set Board computer menu configuration-Board computer menu configuration - byte 7-GPS time to 1 instead of its default 0.

This got me the "Autom. time" Date & Time menu option in the instrument cluster. I set the time to be obviously wrong, then enabled that option. After a few seconds the time corrected itself, but was off by one hour. I then checked in the PCM Date & Time settings and found that Daylight Saving Time was incorrectly enabled. Once I changed that, the time is now correct.

This requires a GPS antenna, as Arne2 noted.

[Arne2]

As a point of info, you noted you have factory wired CarPlay. Do you have Porsche Connect? There's been a fair amount of discussion on a different forum trying to determine which cars have a factory GPS antenna. I've been thinking that it came with Connect, but maybe it comes with CarPlay? (My car came with both.) Since you do have an antenna, activating on-board Nav is a 30-40 minute process.

[julianm]

As a point of info, you noted you have factory wired CarPlay. Do you have Porsche Connect? There's been a fair amount of discussion on a different forum trying to determine which cars have a factory GPS antenna. I've been thinking that it came with Connect, but maybe it comes with CarPlay? (My car came with both.) Since you do have an antenna, activating on-board Nav is a 30-40 minute process.

Neither Nav nor Connect. But yes it did have factory-enabled CarPlay.

I kind-of would like to enable Nav, but my understanding is that it's installing a patched binary somewhere into the PCM? I'm definitely more afraid of that than toggling hidden flags. And I'm not sure the Nav is worth that risk, given we're always using CarPlay.

[Arne2]

I kind-of would like to enable Nav, but my understanding is that it's installing a patched binary somewhere into the PCM? I'm definitely more afraid of that than toggling hidden flags. And I'm not sure the Nav is worth that risk, given we're always using CarPlay.

I activated Nav in mine over a year ago. The process is pretty robust and has proven trouble-free, since I've yet to hear of a single person complain that it bricked his/her PCM. I don't really use Nav much, but it bothered me to know that I had two buttons (NAV & MAP) that didn't work.

[julianm]

I then checked in the PCM Date & Time settings and found that Daylight Saving Time was incorrectly enabled.

After further experimentation, this is a bigger issue. Every time the vehicle is started the DST setting is reset. This will be fine over summer but is not OK right now .

Will have to look around to see if there's another flag to set somewhere. I'm a little concerned since that particular setting lives in the PCM UI, not in the instrument cluster. Will see.

Weirdly, with "Autom. time" OFF, the DST setting will stick between car starts. But with "Autom. time" ON, it resets each start.

[Arne2]

After further experimentation, this is a bigger issue. Every time the vehicle is started the DST setting is reset. This will be fine over summer but is not OK right now .

Will have to look around to see if there's another flag to set somewhere. I'm a little concerned since that particular setting lives in the PCM UI, not in the instrument cluster. Will see.

Weirdly, with "Autom. time" OFF, the DST setting will stick between car starts. But with "Autom. time" ON, it resets each start.

I fought with this a bit on my car as well. Later today I'll dig into my records to see what I ended up with.

[Arne2]

I have a pile of GPS Time changes in my records. Interestingly, some are in the instrument cluster, some in the PCM, and some are tied to key memory. My car is in its winter storage location now, so I can't verify that all is still good. But here is what I have changed.

I do not know if all of this is required, but last I checked mine was behaving properly.

In Instrument Cluster
Board computer configuration key 1--BC configuration byte 13--GPS time set to Open (Default is Shutdown). You will probably need to do this for key 2 as well.

Time_date--Time zone--Summer time set to Open (Default is Shutdown)

Further codings--Further codings byte 3--Time synchronization 2 minutes in GPS set to No (Default is Yes)

Board computer menu configuration--Board computer menu configuration - byte 7--GPS time set to 1 (Default is 0)

Board computer display configuration factory setting--BC configuration byte 13--GPS time set to Open (Default is Shutdown)

In CDR (Communication Management/Cd Radio)
Summer_Time_Shift_Method--shift_method set to USA (Default is Manual)