Settings Day
 

Its July 4th and My wife asked me to confirm that it is the fourth because my 2008 Cayenne S shows its the third i went into the settings menu when we got home. No problem at all setting hours-minutes-12/24 hour on the clock. I cannot find how to set the correct date. it does show the correct year. I finally went into the time zone settings and using the Moscow time zone to show the correct day. I then set the hour and minute for eastern USA time. There is no mention of setting date or year in the owners manual. Something is wrong here, I've got the display correct, however, I had to fool the car into determining it is in Moscow.

Follow up: I went to the local Porsche dealership and talked to them. I was the first Cayenne owner to ask about it and there have been six 911 owners with the same issue. The common thread was we all had older Porsches. The date is supposed to be set by the Atomic clock that the GPS uses. Our government made an update to the GPS system which resulted in the wrong date being displayed by our older radios. I have no idea if anyone is working on a work around.

I was stymied by the same problem with my 2004 Cayenne Turbo. Couldn't figure out where in the PCM I could set the date. The year on mine was showing 1998 for a while, and then one day it was displaying 2006. The local Porsche dealer was no help.... I had another problem that resulted in the car being in the shop with the battery disconnected. When I picked up the car, the time and date were correct. The only thing I can determine is that disconnecting the battery for a period of time, and then reconnecting it allowed the system to reset, and when the PCM reconnected with the satellites, it set the day, date, and time to the current, correct time.......you might try that..............

Same problem here . . . Will try battery disconnect

Please let us know how it worked. The date has disappeared from my display. When I go into the settings menu it shows an erroneous date and year, however, the erroneous date does advance one day every day.

I dropped off my 2005 955 at Rusnak in Pasadena for the transmission recall and asked about the the issue with the wrong day being displayed. The service writer gave the appearance to having HEARD about it but Porsche has no solution yet or any in the works.

At that point I began to in a very detailed manor give an explanation as to what the problem was, “the issue affecting older 995s 996s 986s because of the 1024 week cycle of the GPS system, and the turn over from week 1024 to week one was the source of the problem. Some owners reporting discrepancies from one day to literally years.”

Her reply “Porsche doesn’t have a solution yet.” It was hysterical because the 2 customers in the chairs on either side of me slid their chairs back to hear my description of the problem. Perhaps they also had affected cars.

I checked if my Durametric was able to code the date ... nope. I’m going to send an email to Durametric tonight to see if they can add this to their product.

Has anyone done the old CONTROL-ALT-DELETE ? Disconnecting the battery? I don’t have the desire to take out the drivers seat quite yet.

interesting^

Mine recently reset to 01/01/2000 :-/

I’ve done a little more research on this minor - yet annoying problem.

https://www.theverge.com/2019/3/8/18255847/gps-week-rollover-issue-2019-garmin-tomtom-devices-affected

There is a reported fix, I wish I had this info when I had my recall issue addressed last week . . .


The following “borrowed” From Rennlist

“Date issue can be fix with PIWIS tester,
Select PCM# SELECT ALL CODES#ENTER ALL THE CODES AS PER THE CAR SPECS AND COUNTRY SPECS,

then, select PCM MMI -
Coding and programing
Genaral codes
Date/time
Make sure time zone is correct. Otherwise time and date will run different with navigation.”

I can’t say if this works or not. The contributor on Rennlist claims it fixed this problem. I sent an email out to Durametric last week suggesting this be addressed in their next software update. . . No reply yet.

Great work! ^

FWIW, I just tried pulling the PCM fuse. (Right side fuse block, slot#51. upper row, right 10amp)

Out about 1 minute.

Upon replacing the Date read 01/01/2000 for a few seconds, and then reset to the wrong date it had before. :-/ Also the presets were all still there.

This leads me to believe that the flash memory needs to be reinformed.

. . . follow up.

Since I don’t have a PIWIS laying around I did a little more research.

A guy over on Rennlist reset his 2005 Cayenne S by doing this;

”I rebooted the PCM pressing 1,4, 8 at the same time. Went into setup set date and time and I am good to go.”

I haven’t tried this yet.

Just wanted to share with the group.

I went to "SET" and highlighted PCM and then pressed 1, 4 and 8 at the same time. Everything went black. Then it seemed to re-boot and everything came back as it was. Still no date shown at all. The time zone option is now shadowed out and I can no longer choose it. I then went one step further and selected the PCM option and then rather than being just highlighted I clicked on it. This brings up the options of setting the time, hours, minutes, format and other stuff that looks alien to me. I then pressed 1,4 and 8. The only response was the radio station changed to the preset station I had on button 8. This old man is not doing something correctly. I hate trying to do something that I know nothing about. Most of the time it ends up with me writing a check to someone to repair my screw up. My problem is no longer the loss of the present date display. It has changed to if it is really worth it to have the date displayed when my watch or a calendar shows me.

I am sorry it did not work. It seems that this option is hit or miss. The likely best fix we will have is if Durametric adds this coding option on their next update.

UPDATE: After 8 years it was time for a new battery. The battery was disconnected for an hour. Upon reconnecting the new battery, the date was absent. Usually the middle right box in the Home Screen has the date. After the battery swap the middle box is blank. I drove the car for two hours with several stops. The area remains blank.

Actually I rather have it blank than display the wrong date. Oh nuts. . . I just jinxed myself.

EDIT: I’m reviving this older thread because it frustrates me. I checked the Durametric website hoping they have added this coding feature to correct the problem. . . Nothing yet.

My PCM was updated to the latest available software version in 2013. That may explain the different ways different PCMs are reacting to the 1024 week GPS hiccup

Nothing has been forthcoming from Porsche. I did ask one of the service advisors at the dealership and was told that he had brought this issue up on a conference call with Porsche. That's all, just brought it up. No response. Its taken a back seat because of the issues that I have now. Had to replace the dash multi display that went blank. Now I get the "Check headlight beam adjustment" message every time I drive the car. Probably due to the replacement of a lot of front suspension pieces due to broken coil over and other things. Had an independent garage look at the headlight beam issue and they could not diagnose it. No codes. I am very frustrated with this. No code so we can't fix it mindset. We got rid of our Audi A8 because of that mindset. When I asked the garage if they checked the headlight beam adjustment, like the message says to do, I got a blank look and it wasn't on the invoice.

I have a Durametric ODB2 scanner for Porsche cars. If I was pulling that headlight code I would reset the error and see if it comes back. . .

Your problem is certainly a PITA.

Sorry

Update. . .

I drive my Cayenne once or twice a month about 120 miles. This morning I noticed the middle box that displays the date is now showing 1/16/03. The clock is 12 hours ahead. There was no interruption to power for the truck.

I would rather have the date area be blank than display the wrong date.

It must have received a signal from the GPS system. Unfortunately there is no way to manually set the date.

Also, the clock does not keep very accurate time. It loses a minute or so every month.

I’m going to research this further, hopefully I’ll come up with a solution.

Found a a TSB on the issue. . .

https://static.nhtsa.gov/odi/tsbs/2019/MC-10169751-0001.pdf

From what I understand from the TSB, it looks like you need a PIWIS to manually change the date.

Stay tuned. . . I’m still looking.

UPDATE

From Rennlist, start reading from thread #107

https://rennlist.com/forums/cayenne-955-957-2003-2010/1099700-can-t-set-the-date-8.html

From the thread. . .

#107
“You can disconnect the power harness or disconnect the MOST connection to the DVD unit. The PCM has to think that you don’t have navigation. Once nav is disconnected, the date adjustment feature will show up. This is how dumb the design was.

Your era of Cayenne and 997 designed by the Bose system used MOST, fundamentally they have the same design and same logic. If it is easy for you to access the navigation drive. Either disconnect the fiber optic or the power harness will do. Give it a try, you have nothing to lose.”

#110
“E39Nutz, your the man!!! We owe you.
After pulling fuses, nothing. After asking a Penske Porsche dealer, nothing.
Pull the MOST cable, bam, date can be set.
i moved the passenger seat all the way forward and up, and from the back seat reached under, not the easiest cause there is an hvac duct and then the metal frame holding the dvd unit, and we all know porsche connectors can often require 2 hands. MOST only need 1, got my hand in there after pushing down on the hvac duct, disconnected it.
Started it up, got the normal warnings on the PCM that dvd, amp, etc. are no longer connected, just press the right knob to enter, then go to the main screen, hit set, think I got another error so pushed the right knob to enter again, then select set date and bingo, you can change it now!!! Not just the date format anymore, day month and year are now there.“

Reviving an old thread. . .

Unfortunately I have not found any success stories repairing the 1024 week GPS bug in our vehicles that displays the wrong date. I would have hoped that by now someone would have dealt with a dealer who could use a PIWIS tool to set the date to the correct setting.

There is however a Porsche solution. . .

https://apple.news/A1t1ARajVSGuH_rm8H4KmgA

Porsche makes a drop in head unit for 955, 996, 997, 987s affected by this GPS glitch.

The new head unit costs $1,500 and provides modern Bluetooth, touchscreen and streaming capabilities to the vehicle.

Considering my 2005 955 has only 63,000 original miles I may end up going this route. I’m guessing the dealer will charge $500 for labor putting this “repair” at around $2,000.

To be honest, I half expect my head unit to start “acting up” any day now. After all it is nearly 20 years old.

Well. . . crap. I was annoyed but dealing with the wrong date on my PCM but now another issue is popping up. The map display does not seem to scroll as the vehicle travels. It has stayed stuck at the same location. Occasionally it will correct itself for a brief moment but almost immediately goes back to a spot when the issue first occurred, 60 miles away.

The audible directions appear to be correct. The map is just off. Occasionally the screen will show “Loading Map,” but never quite finishes the process.

I’m calling the dealer tomorrow to get the headlight recall addressed. I’ll get a quote for the new Porsche head unit I mentioned in post #18.

Ouch.

I called Rusnak Pasadena Porsche for a quote on the Porsche Classic Communication Management Plus (PCCM Plus)

-retrofitted touchscreen device
-with Apple CarPlay and Android Auto functionality.
-available for the 997 Porsche 911 and 987 Porsche Boxster and Cayman built from 2005 to 2008,
-available for generation Porsche Cayenne built from 2003 to 2008.

Head unit $1,474.99
Additional parts/software $363
2 1/2 hours book time for installation $667

Total cost for upgrade. . .

$2,506

Not sure it is worth the upgrade.

EDIT: I called the parts department directly and got some clarification.

Head Unit: 1474.99
SD Card : 193.04 (software and maps)

Total=$1,668.03

Installation took 3 or so hours in 997s and 996s. They have never done a 995 but figure 2 1/2 hours at $290 an hour.

Edit #2

Well. . . damnit. I did it. I went ahead and ordered the PCCM. It will be installed as the dealer receives it. The parts deptarent guy says each dealership gets (is allocated) 3 units a month. I’ll keep you guys updated.