What causes digital instrument panel to do this? (pics)
10-13-2007, 01:16 AM
#17
Instructor
Jeeze, a post you don't want to read!
I have the same issue, but the question is when it all goes pearshaped how come the oil pressure indicator continues to operate?
I have the same issue, but the question is when it all goes pearshaped how come the oil pressure indicator continues to operate?
10-13-2007, 04:36 AM
#18
G'day Hilton
Thanks for your kind words, but I'm afraid I can't really answer your question about backwards-compatibility with any confidence. My suspicion is that later boards might not be completely compatible. I say this because, for example, GTS cars had ABS and PSD, which the earlier cars probably did not and these features have indicators on the instrument panel which would need dedicated terminals in the connector strips.
If the new board Aryan bought is indeed one from new stock it might be the answer to your problem, (mine too, I'd like my warnings in English) if a little pricey. But as you might remember from my archive post even if you have a board of the correct MY and software level (K18 for the '89) there are still lots of regional variations. I searched PET and couldn't find an Aus-specific cluster so my guess would be that Aus market cars probably have the same board as mine (PN 928 641 154 01) or possibly the Canadian board.
If you are prepared to be a guinea-pig and can find a few second-hand clusters I would be really grateful if you'd keep me in the loop on what you learn. Jim Bailey would be the man to ask about US software levels. 928 International must have heaps of clusters and the level is shown on a paper label on the back.
Colin. 89GT
Thanks for your kind words, but I'm afraid I can't really answer your question about backwards-compatibility with any confidence. My suspicion is that later boards might not be completely compatible. I say this because, for example, GTS cars had ABS and PSD, which the earlier cars probably did not and these features have indicators on the instrument panel which would need dedicated terminals in the connector strips.
If the new board Aryan bought is indeed one from new stock it might be the answer to your problem, (mine too, I'd like my warnings in English) if a little pricey. But as you might remember from my archive post even if you have a board of the correct MY and software level (K18 for the '89) there are still lots of regional variations. I searched PET and couldn't find an Aus-specific cluster so my guess would be that Aus market cars probably have the same board as mine (PN 928 641 154 01) or possibly the Canadian board.
If you are prepared to be a guinea-pig and can find a few second-hand clusters I would be really grateful if you'd keep me in the loop on what you learn. Jim Bailey would be the man to ask about US software levels. 928 International must have heaps of clusters and the level is shown on a paper label on the back.
Colin. 89GT
10-13-2007, 06:19 AM
#19
Nordschleife Master
G'day Hilton
If you are prepared to be a guinea-pig and can find a few second-hand clusters I would be really grateful if you'd keep me in the loop on what you learn. Jim Bailey would be the man to ask about US software levels. 928 International must have heaps of clusters and the level is shown on a paper label on the back.
Colin. 89GT
If you are prepared to be a guinea-pig and can find a few second-hand clusters I would be really grateful if you'd keep me in the loop on what you learn. Jim Bailey would be the man to ask about US software levels. 928 International must have heaps of clusters and the level is shown on a paper label on the back.
Colin. 89GT
The 90 panel is software level K25 - part number 928 641 154 02. I've ordered a bunch of LED's, so time permitting will hopefully get to try swapping panels in the next month or so (I have a 1yo daughter.. so work is sporadic
).Will post any useful updates here.
As for US software, my mother in-law lives 20 miles from 928 intl, so when we're next heading for a visit I'll be getting in touch and taking an eeprom reader with me.
10-13-2007, 11:10 AM
#20
Rennlist Member
Recently, I tore into my '90 cluster to see about adjusting the voltmeter and otherwise checking accuracy of the guages. I called three different well-recognized authorized Bosch repair facilities and talked to the techs who actually work on those panels. The universal opinion is that they are not repairable to a degree of confidence that they felt they could stand by the repair. There are no adjustments, and all three recommend replacing the board. Just their opinion(s).
10-13-2007, 01:27 PM
#21
Hilton
According to PET your cluster is actually for a ROW (non-euro) 90 S4 manual, not a GT so it might be a better match than you think. It's donor car could have had none, any or all options of airbags, RDK, ABS and PSD so it will be an interesting experiment to see if it will work on your 89 S4. I have an S4 PC board in my GT and it works fine.
It's probably only of academic interest but there is a quick check to confirm the GT cluster. The GT tach has it's redline at 6600, the S4's is at 6400rpm.
Colin 89GT
According to PET your cluster is actually for a ROW (non-euro) 90 S4 manual, not a GT so it might be a better match than you think. It's donor car could have had none, any or all options of airbags, RDK, ABS and PSD so it will be an interesting experiment to see if it will work on your 89 S4. I have an S4 PC board in my GT and it works fine.
It's probably only of academic interest but there is a quick check to confirm the GT cluster. The GT tach has it's redline at 6600, the S4's is at 6400rpm.
Colin 89GT
10-13-2007, 01:41 PM
#22
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Colin & Hilton,
Read post #14 - they are repairable.
My gut feeling is the later software level boards will work.
Most of the later indicators ar already in the 89 board - PSD & Airbag.
This was a software update and not hardware. My new CB for the GTS was the latest level of software and not the level quoted in PET.
I keep meaning to try the older boards in my GTS cluster - but if it aint broke do not fix it.
Roger
Read post #14 - they are repairable.
My gut feeling is the later software level boards will work.
Most of the later indicators ar already in the 89 board - PSD & Airbag.
This was a software update and not hardware. My new CB for the GTS was the latest level of software and not the level quoted in PET.
I keep meaning to try the older boards in my GTS cluster - but if it aint broke do not fix it.
Roger
__________________
Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission?
George Layton March 2014
928 Owners are ".....a secret sect of quietly assured Porsche pragmatists who in near anonymity appreciate the prodigious, easy going prowess of the 928."
Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission?
George Layton March 2014928 Owners are ".....a secret sect of quietly assured Porsche pragmatists who in near anonymity appreciate the prodigious, easy going prowess of the 928."
10-13-2007, 01:44 PM
#23
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Algie,
Mine was the same - everything would stop working apart from the oil pressure gauge.
Do not know the answer but changing out the CB fixed it.
Roger
Mine was the same - everything would stop working apart from the oil pressure gauge.
Do not know the answer but changing out the CB fixed it.
Roger
10-13-2007, 07:42 PM
#24
Nordschleife Master
Colin: The first orange tick on the tach is at 6600 on the '90 panel. There were no manual S4's after MY89 (mine is one of the few 5-speed S4's with digital dash) - once they brought out the GT, only auto S4's existed. Perhaps a PET anomaly?
Roger: I suspect your gut is right and that it'll work - I'll report back on results when I get a chance to dismantle the pod. I didn't know the PSD and Airbag lights were preent on mine.. I'll have to go have a close look at it and see now If they are, then that makes the chance of a working swap much higher.
If it does work, I still want to work out how to adjust the mileage on the newer panel so it matches my car's service history as I'd rather not have potentially dubious under-reporting of the car's mileage.
Roger: I suspect your gut is right and that it'll work - I'll report back on results when I get a chance to dismantle the pod. I didn't know the PSD and Airbag lights were preent on mine.. I'll have to go have a close look at it and see now
If they are, then that makes the chance of a working swap much higher.If it does work, I still want to work out how to adjust the mileage on the newer panel so it matches my car's service history as I'd rather not have potentially dubious under-reporting of the car's mileage.
Hilton
According to PET your cluster is actually for a ROW (non-euro) 90 S4 manual, not a GT so it might be a better match than you think. It's donor car could have had none, any or all options of airbags, RDK, ABS and PSD so it will be an interesting experiment to see if it will work on your 89 S4. I have an S4 PC board in my GT and it works fine.
It's probably only of academic interest but there is a quick check to confirm the GT cluster. The GT tach has it's redline at 6600, the S4's is at 6400rpm.
Colin 89GT
According to PET your cluster is actually for a ROW (non-euro) 90 S4 manual, not a GT so it might be a better match than you think. It's donor car could have had none, any or all options of airbags, RDK, ABS and PSD so it will be an interesting experiment to see if it will work on your 89 S4. I have an S4 PC board in my GT and it works fine.
It's probably only of academic interest but there is a quick check to confirm the GT cluster. The GT tach has it's redline at 6600, the S4's is at 6400rpm.
Colin 89GT
10-13-2007, 09:27 PM
#25
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Hilton,
You can only change the milage on a new CB and then you only have the first 250 miles to do it as after that it defaults to the 250.
Roger
You can only change the milage on a new CB and then you only have the first 250 miles to do it as after that it defaults to the 250.
Roger
10-13-2007, 10:32 PM
#26
Drifting
I remember looking into resetting the odometer several years ago.. With a web search, I found two companies that claimed to be able to do this as a service on the 928's digital clusters.
They used an in-circuit EEPROM programmer to reset to any value you wanted. One was in Europe and the other was in Canada.
Never used the service, was just interested in if anyone was doing it. They may no longer be in business.
They used an in-circuit EEPROM programmer to reset to any value you wanted. One was in Europe and the other was in Canada.
Never used the service, was just interested in if anyone was doing it. They may no longer be in business.
10-14-2007, 01:04 AM
#27
Drifting
here's one.... they say they can have it done in 60 minutes....
http://www.tachoprogrammierung.de/od...Porsche-51.htm
and this hardware look interesting....
http://shop.gtronica.com/download/au...-%20Manual.pdf
http://www.tachoprogrammierung.de/od...Porsche-51.htm
and this hardware look interesting....
http://shop.gtronica.com/download/au...-%20Manual.pdf
10-14-2007, 01:56 AM
#28
Hilton
Looking ar PET a bit more carefully I notice that it doesn't list any GT instruments after 89, -only auto or manual but from the tach you clearly have a GT cluster there. In fact S4 manual cars were made in 90 and 91 but only to special order. (Likewise one could order a GT auto. Roger would probably have been the only customer for one of those!) Trawling even more through PET I found that as I suspected the PC board in your GT cluster was the same one used in the '90 Canada cars. Both manual and auto versions.
Roger is right about the odometer reset. There is an outfit here in Cape Town that claims to be able to reset the odo as Borland suggests but they wanted R2000 (about US$300) so I decided against it. According to Erkka (Vilhuer) there are lots of such companies in Germany.
Colin. 89GT
Looking ar PET a bit more carefully I notice that it doesn't list any GT instruments after 89, -only auto or manual but from the tach you clearly have a GT cluster there. In fact S4 manual cars were made in 90 and 91 but only to special order. (Likewise one could order a GT auto. Roger would probably have been the only customer for one of those!) Trawling even more through PET I found that as I suspected the PC board in your GT cluster was the same one used in the '90 Canada cars. Both manual and auto versions.
Roger is right about the odometer reset. There is an outfit here in Cape Town that claims to be able to reset the odo as Borland suggests but they wanted R2000 (about US$300) so I decided against it. According to Erkka (Vilhuer) there are lots of such companies in Germany.
Colin. 89GT
10-14-2007, 02:29 AM
#29
Nordschleife Master
The WSM says the lockout to manual changes occurs at 256 miles or 256 km.. which is significant in the computing world and gives a clue as to how they'e encoded the odometer reading in the firmware. All I have to do is figure out which bytes are the odometer, and besides it'll be useful knowledge to be able to pass on to anyone who's interested in refurbishing digital dashes (at some point, we're all going to need a replacement.. its a "when", not an "if").
Sadly I have a lot to do between now and having the time to work on my dash.. whole new clutch assembly, motor mounts, timing belt job, and a few other things must come first, and those all have to be fitted in around my wife and daughter
Last edited by Hilton; 10-14-2007 at 05:26 AM.
