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OBC retro-fit - PST can't find instruments cluster

G

g_gribbin

New member
Attempted an OBC retro-fit on my 2003 MY 986 through an independent who has experience of doing this mod.

Unfortunately all didn't go to plan after the additional wires and switch were installed. It appears that the PST couldn't find the instrument cluster or the a/c, even with the switch disconnected.

I took the car to an OPC today and they had the same thing, their PST-2 couldn't find the cluster or the a/c. And of course if you can't find the cluster you can't turn on the OBC.

Has anyone been successful in retro-fitting the OBC to a 2003 MY 986 as I would appreciate some guidance. Again has anyone come across the problem of PST not finding the cluster or a/c?

Any insight/help/comments appreciated.

Thanks,
Gabriel
 
Have you (or anyone else) done any wiring on the car? The diagnosis line from the instrument cluster and the air conditioning connect to the same point on the OBD2 connector. Maybe something/one has damaged the wiring loom.
 
Keep us posted Hope Richard's points helped and good luck as I also want to have cruise and OBC activated via porsche specialist in Oxon in the relative near future.
 
To be more precise, the diagnostic wire which connects the instrument cluster to the diagnostic socket is orange/blue and connected to pin 28 of the green cluster plug. (The OBC connections are made to the grey plug, by the way). I think I would be tempted to check for continuity between pin 28 and pin no. 3 on the OBD2 diagnostic socket.

The other diagnostic lines which connect to pin 3 are:
Airbag
PSM or ABS
Aircon
Seat Memory
Park Assistant

Apart from the aircon, were there any other modules which couldn't connect? (If you have those options, of course)
 
Richard,
Thank you for your help.

I am fairly sure that it was only the a/c and instument cluster that did not come up on the PST, the OPC did a scan and these appeared to be the only two that did not come up. The air bags didn't seem to have any errors.

I had an airbag de-activation kit fitter a few weeks ago, thats the only mod I am aware of, other than the attempt at the OBC activation. However I have only had the car a few months so can't be sure what went on before.

I'll have a go at checking the continuity, is pin 3 on the OBD socket numbered or can you give me a pointer in identifying it.

John,
BTW the speacialist was in Oxon and he was more disappointed than I was that the mod could't be activated.

Thanks,

Gabriel

 
This is the socket as you look at it:

22A4B6FD1DB2448A8FF681DFBE3DA31A.jpg
 
Richard,
Thanks for the diagram.

Could I test the contunuity by putting a digital volt meter between pin 3 and ground with the ignition on? Would a voltage reading suggest that the wire is OK and the fault lies within the cluster.

Regards,

Gabriel
 
May I also suggest that if you have access to the older PST2 that you do a 'vehicle handover' to reset all the computers in the car.

btw The newer PIWIS will only perform this on the newer cars.

 
ORIGINAL: g_gribbin

Richard,
Thanks for the diagram.

Could I test the contunuity by putting a digital volt meter between pin 3 and ground with the ignition on? Would a voltage reading suggest that the wire is OK and the fault lies within the cluster.

Regards,

Gabriel
Click to expand...
No, I'm afraid that won't work. You will have to remove the cluster and check the continuity between pin 28 of the green connector and pin 3 of the OBD2 socket. My feeling is that you probably have a break in this line.
 
Checked the continuity between pin 28 on the green socket and pin 3 on the OBD socket and there is a good connection. So does this mean something up with the cluster, it seems that way. Any suggestions of where to get it fixed would be welcome.


 
Hmmmm. Sounds like it might be a problem with the cluster, but it is hugely coincidental that the PST2 can't communicate with the aircon controls either. Perhaps it might be worth trying Nick's suggestion of doing the vehicle handover routine, as (if you are close to Nick or me) it wouldn't cost anything to give it a try.

BTW, is your alatm system working OK? Do the interior lights autodim after closing the doors? Do the windows one-touch down? It's just another indication that it might have slipped into 'transit mode'.
 
I am in Harrow and appreciate the offers.

Checked the auto dimming on the interior light and that works as does the one touch down/up on the windows.

I have been lucky in the past getting the OPC to plug in the PST for no charge, so I may try my luck there first. Can you possibly describe the path to the vehicle handover routine, as they sometimes need a little directing if it is something out of the ordinary.

Another random thought, could some configuration change have happened as a result of the re-programming for the air bag de-activiation kit that was done a few weeks ago?

Gabriel
 
Coding for the child seat restraint system is done in the Airbag/POSIP module, so I wouldn't have thought that would affect the cluster or aircon. Having said that, you usually have to do a complete control module search in order to code any of the modules. Of course, if the tester can't find a module it won't prevent one that it can find from being coded. You would have thought that whoever did the coding would have noticed that it couldn't find them though, and made you aware. I assume your airbag light flashes for 10 seconds when you have the child seat in position and switch on the ignition? Not that it makes any difference to your problem though.

On a PST2, the Sports Car Handover routine is in the Special Functions menu. On the PIWIS I believe it is in the 986 Diagnostics menu (from memory). They should be familiar with the system though, as the OPCs have to go through that procedure for every new car they deliver. It wakes up all the appropriate control modules from energy-saving (transit) mode.
 
ORIGINAL: Richard Hamilton

Coding for the child seat restraint system is done in the Airbag/POSIP module, so I wouldn't have thought that would affect the cluster or aircon. Having said that, you usually have to do a complete control module search in order to code any of the modules. Of course, if the tester can't find a module it won't prevent one that it can find from being coded. You would have thought that whoever did the coding would have noticed that it couldn't find them though, and made you aware. I assume your airbag light flashes for 10 seconds when you have the child seat in position and switch on the ignition? Not that it makes any difference to your problem though.

On a PST2, the Sports Car Handover routine is in the Special Functions menu. On the PIWIS I believe it is in the 986 Diagnostics menu (from memory). They should be familiar with the system though, as the OPCs have to go through that procedure for every new car they deliver. It wakes up all the appropriate control modules from energy-saving (transit) mode.
Click to expand...

Richard,

They will need a PST2 not the PIWIS as the 'Special Function' menu no longer includes 986/996 functionality.

He is 13 miles from me and probably closer than his OPC.

Possibly a 5 minute fix but we will see.
 
On each of the PIWIS 987/997etc diagnostic menus there is a 'Special Functions' option containing 'Vehicle Handover', amongst others. However, on the model selection screen there is also a Special Functions tab, which if you select it brings up the old Sports Car Handover routine as shown in the pic. That's how I understand it anyway, although I haven't had to use the function on the PIWIS so only assume that it works!

94283C4710F14096934B2A33079AE6D6.jpg
 
Are there it is .... Yes on the original PST2 it was on the model pages.

It should work as before.
 
I came across this in the useful links section. What is the DME and is this relevant to the problem I am experiencing?

Regards,

Gabriel

[blockquote]quote:

ORIGINAL: Howard Davis

Has anyone tried this on a 2003 MY car ?
[/blockquote]


Yes. I have done the full OBC retrofit by replacing the standard 2-stalk control with OBC 3-stalk assembly, as just enabling the OBC on a 2001> doesnt display the OAT, because this shares the same display area as the trip odometer. Also required is some wires and connectors to make up the wiring loom, which takes the control signals from the OBC stalk to the instrument cluster, as this is not present on a non OBC vehicle.

I got the OPC (Edinburgh) to enable the OBC using the PST2 machine. They also had to programme the DME as you have to do on some 2003> models, to allow the technician to enable the OBCInstrument cluster.

PM or email me if you need any more info

The picture below shows the now visible OAT by cycling throught the options using the stalk


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http://www.porscheclubgbforum.com/upfiles/1385/185AD41626284409BBBBA6412B28FA6C.jpg

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Attachment (1)

< Message edited by TopBear -- 12/6/2004 18:59:41 >
 
DME is the engine ECU (Digitale Motor Electronik).

On Boxsters with the later instrument clusters, you have to ensure that the Order Type is entered in the Vehicle Data section of the DME. If you don't do that, you won't get the coding option for OBC in the instrument cluster.

That isn't your problem........
 
.... However, once the instrument cluster problem is corrected and assuming it has not been done the Order Type will have to be re-entered in the DME to allow the coding of the OBC function.

For the UK the model type is 986321 I believe. The US variant is 986320 for a 2003 S model.
 
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