7 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHHelp needed, problems with satnav and clock
Leading reported evidence
Install gps receiver loses its so-called almanac
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
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Performed · outcome unconfirmed
GPS receiver: After an interruption in the power supply (terminal 30), the installed GPS receiver loses its so-called almanac.
Leading evidence: 'Install gps receiver loses its so-called almanac' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Adjust (calibrating) pcm navigation unit' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Performed · outcome unconfirmed · Original poster
Sees satellites galore, been away for weekend and left the 911 at home in disgrace,( used our p307 diesel) Drove to work and all of a sudden the system started to work!
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Suggestion
91 12 15 Adjusting (calibrating) PCM navigation unit
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
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Suggestion · Original poster
To check the antenna is best to start with the PCM2 end or up on the dashboard?
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Suggestion
The distance signal changes if the circumference of the tyre changes (e.g.
Discussions that performed work without a confirmed outcome
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
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Performed · outcome unconfirmed · Original poster
Sees satellites galore, been away for weekend and left the 911 at home in disgrace,( used our p307 diesel) Drove to work and all of a sudden the system started to work!
Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.
7 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Porsche Club GB: 1 discussions
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Generation: 20261026T165820Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hi
Me again with 996 C2 Man with PCM2
The car has had a new battery and front s/assys and since then the gps is not seeing any satellites, and the clock that takes is time from the gps is not working
Have tried various fixes:
disconnet battery
1-4-8 on sat nav
taken out fuses
left car outside etc
and still no satellites being seen
so thinking that the GPS antenna is bust, - could anything have been damaged when the battery was replaced? To check the antenna is best to start with the PCM2 end or up on the dashboard?
My DIY skills are poor
Any advice - help - suggestions would be great, Have to say that I am on a budget and cant afford dealer prices
Thanks in advance, becoming obsessed with this
I did read somewhere once on forum that car had to be driven for a while to recalibrate satnav...... I'm sure Richard will be along soon to give his advice[
]
atb
Paul
How long has it been since the battery was changed, or last disvconnected? The GPS antenna needs a clear view of satellites for several minutes before it will connect. If it is inside a garage, it won't be able to pick them up.
Edit: Here's what the manual says:
91 12 15 Adjusting (calibrating) PCM navigation unit
General
The PCM navigation unit must be calibrated after maintenance work or commissioning. Calibration is the prerequisite for exact route guidance.
The following components of the PCM navigation unit must be calibrated or initialised:
GPS receiver: After an interruption in the power supply (terminal 30), the installed GPS receiver loses its so-called almanac. The almanac stores the satellite orbits and ensures fast location of the individual satellites when the system is started.
Distance sensor: The distance sensor transmits the distance travelled to the PCM navigation unit. The distance signal changes if the circumference of the tyre changes (e.g. tyre change). This modification must be calibrated by the PCM navigation unit afterwards.
Note
The distance sensor must be calibrated after commissioning of the PCM navigation unit or after changing a tyre. If a system that has already been calibrated is disconnected from the power supply (terminal 30), the calibration of the distance sensor is retained.
Gyroscope: The gyroscope detects changes in the direction of travel and must beA calibrated after commissioning.
The gyroscope shows temperature-dependency. This temperature-dependency is compensated by the system if the "cold" (not calibrated) system is switched on and left to stand for approx. one hour.
Note
The gyroscope must be calibrated after commissioning only. If a system that has already been calibrated is disconnected from the power supply (terminal 30), the calibration of the gyroscope is retained.
Procedure after commissioning:
Please observe the sequence!
1 Switch on the PCM with a free panoramic view for approx. 20 minutes (to load GPS almanac).
2 Drive on a motorway if possible at a speed greater than 60 km/h for a distance of approx. 50 km (calibration of the distance measurement).
3 Drive approx. 10 km in an urban area and take frequent turn-offs. Stop for approx. 10 seconds occasionally (calibration of the gyroscope).
4 Switch on the PCM navigation unit for approx. one hour with the vehicle horizontal (temperature compensation of the gyroscope).
Calibration is necessary after the following maintenance work:
After changing a tyre
After the power supply has been interrupted
Procedure after changing a tyre
Drive on a motorway if possible at a speed greater than 60 km/h for a distance of approx. 50 km. (Calibration of the distance measurement).
Procedure after the power supply has been interrupted:
Switch on the PCM with a free panoramic view for approx. 20 minutes (to load GPS almanac).
UPDATE
After six plus weeks and countless hours of frustration the satnav has started to work.
Sees satellites galore, been away for weekend and left the 911 at home in disgrace,( used our p307 diesel) Drove to work and all of a sudden the system started to work!
Very happy and relieved and a great thank you for your help
Rgds
Jonathan[
]
This is a source reference. Confirm exact model applicability in the original material.
