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Seth Nichols

2006, C4S, 6-Speed Manual, US - Incorrect Date Displayed on Radio/Nav Display

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I have a 2006 C4S 6-Speed with Nav option.  The date displayed is incorrect.  I can easily and successfully update the time, 12/24hr format and date format but there is no option to change the actual date.  Reset factory settings but date is still incorrect (displays 11/20/2000 now).

Also, when I turn on the car for the first time of the day (following overnight rest period) the radio appears to be playing but no sound.  I am able to change the station(s) but no audio.  I have to turn the car off, wait until I hear the radio or other accessories turn off (approx. 20 seconds), then I can turn the car back on and the audio comes on when the radio/nav system comes on and everything is fine.  Very strange.  Any ideas?

I just purchased the car and these issues seem to have come with it.

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Sounds like your “radio on but no sound” is probably a sticky power relay for the amp. Try this out - when you first get in the car instead of on motion of key in and start turn the key to ignition on and wait. Does the sound come on after a few seconds?


On the date, I don’t have a 997.1 anymore, but I recall that to be configured in the PCM. Dig through the menues...

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The PCM takes its time signal from GPS.  Is the navigation working properly?  This is what the workshop manual says about the time setting after changing a PCM2.1 unit:

For vehicle equipment with DVD navigation unit, switch on the PCM in clear surroundings (to load GPS almanac); as soon as four satellites are identified the almanac will reload. The time is updated again when there is a plausible GPS reception (four satellites). The date and time are also adopted once the GPS almanac has been loaded; it may be necessary to change over to summer time (daylight-saving time). This time is transferred to the instrument cluster. If the time is then manually changed by means of the instrument cluster, this time is adopted by the PCM and synchronised with GPS time.


There is a screen which shows the number of satellites being received.  Maybe also try switching to summer time to see if it will pick up the date.  It can take a long time to update the GPS almanac, so be patient and check the date setting after a day or two.

As for the sound, I can't help I'm afraid.  Are there any on-screen messages?  It is going into mute when you first switch on?

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First of all, thank you for your suggestions.  This is an amazing way to get help and I love it!


jaybart - I tried just turning the key on and waiting, but the audio does not come on even after waiting several minutes.  The radio displays the current station/song and changes if I change the station, but no sound comes out.  I tried mute/unmute but no change.  I have to turn the key off and wait until I hear the radio head unit make a noise.  Then I can turn the car back on and the radio automatically starts playing without me touching a thing.  Weird.  I guess it just adds about 60 total seconds to my first start up of the day.  ...first world problems, right?


Mr. Hamilton - I found that the Nav system was getting a signal from up to 11 satellites, but it was I was not able to enter destinations to start route guidance.  It said "Navigation not active" so I tried resetting the head unit by pressing the 1, 4 & 8 buttons.  This seems to have done something because a few minutes later I was able to use route guidance for a local destination.  The date did change, but not to the correct current date.  I set it to "summertime" and now I will wait for a few more drives to see if it updates.  We'll see.


Again, thank you guys for your input.  This is a great resource and I appreciate your willingness to share your knowledge.

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