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Old 11-15-2019, 01:55 PM
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Question Question about diagnostic port not working please. 1996 Z3

Hello guys,

I have the airbag light on and needed to reset this so I've ordered the C310 (which will be delivered on Sunday).

In the meantime, I connected my laptop to the 20-pin diagnostic port and ran ISTA. It won't identify. Says something like turn ignition on? Seems like no power to port?? But I wanted to ask you guys:
1. does ISTA even work on our cars?
2. And also, is there a specific fuse that I should check? (I'm thinking the ISTA software might not be compatible and hopefully when my C310 arrives, I'll get some answers.

Thanks guys in advance
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Last edited by First; 11-15-2019 at 03:03 PM.
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  #2  
Old 11-15-2019, 09:39 PM
Blacklane Blacklane is offline
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ISTA is way too modern for these cars. You need an INPA reader.
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Old 11-16-2019, 03:27 AM
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Originally Posted by Blacklane View Post
ISTA is way too modern for these cars. You need an INPA reader.
Thank you for your reply. This puts me at ease somewhat that the diagnostic port might be working. I have INPA but it doesn't show support for our Z3 either (version 10/10/17. Mine is a 96 1.9. I attached a pic.
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Old 11-16-2019, 06:23 AM
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You need to use the round port in engine compartment but you won't be able to use your laptop.
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Old 11-16-2019, 07:26 AM
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Originally Posted by RogerEH View Post
You need to use the round port in engine compartment but you won't be able to use your laptop.
Thank you for the reply. The scanner should be delivered on Sunday. I'll post an update.
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Old 11-16-2019, 02:05 PM
NZ00Z3 NZ00Z3 is offline
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The early Z3's have a mix of ODB1 and ODB11 for the diagnostics. INPA will not work unless you are using a serial port on a very old laptop.

Your scanner should be able to communicate to the airbag computer.
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Old 11-16-2019, 03:13 PM
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Originally Posted by NZ00Z3 View Post
The early Z3's have a mix of ODB1 and ODB11 for the diagnostics. INPA will not work unless you are using a serial port on a very old laptop.

Your scanner should be able to communicate to the airbag computer.
I guess that makes sense. I'm using a new laptop with windows 10 with both INPA and ISTA installed. I'll update when I get my scanner.
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Old 11-18-2019, 07:29 AM
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Update:

I hooked up this scanner and it says communication error. Maybe the diagnostic port is not getting any power? Is there a specific fuse I should be checking? I don't see one that would say for "diagnostic port". Is the fuse shared by another component. I connected under the hood. It's a 1996
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Old 11-18-2019, 09:07 AM
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I checked the inside diagnostic port and it too is not working. Any specific fuse I should be looking at?
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Old 11-18-2019, 12:15 PM
NZ00Z3 NZ00Z3 is offline
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Hi

Attached is the wiring diagram for your car. It covers the diagnostics port. Hope it helps
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File Type: pdf 1996 BMW Z3 Electrical Troubleshooting Manual.pdf (8.51 MB, 25 views)
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  #11  
Old 11-18-2019, 02:56 PM
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Quote:
Originally Posted by NZ00Z3 View Post
Hi

Attached is the wiring diagram for your car. It covers the diagnostics port. Hope it helps
Thank you so much for this. However, this is like a foreign language to me. I don't think I could even begin to understand this. I was thinking that maybe the connections to this port are lose or dirty. Wanted to spray contact cleaner in it and wanted to see if it was attached by a connector and see if that could be lose or cleaned up but I didn't know how to get the rubber boot off the bottom.

Anyone done this before or know how?

Regards
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Last edited by First; 11-19-2019 at 04:46 AM.
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  #12  
Old 11-18-2019, 03:30 PM
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Some success I think...........

I had earlier tried to reset the oil service light by jumping #7 and #19. Had absolutely no success. I just tried it now and instead of using the #19 (which is ground), I attached #7 with the ground nut for jump starting negative terminal and it worked and reset my oil service light. This leads me to believe that the ground wire on the terminal may be where the fault is. How do I proceed to check that ground wire on the diagnostic port? I can't get the rubber boot off from the bottom. And is that ground wire soldered in or is it a plug that may be loose? I think this might be a reason why scanner is not getting connected.
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  #13  
Old 11-19-2019, 04:24 AM
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bob lindquist bob lindquist is offline
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Quote:
Originally Posted by NZ00Z3 View Post
Hi

Attached is the wiring diagram for your car. It covers the diagnostics port. Hope it helps

People may not know how great it is that you posted the whole document in pdf!


I bought mine back in 2000 and find it invaluable.
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Old 11-19-2019, 07:36 AM
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Has anyone taken apart their round diagnostic port? Are the wires in the back soldered or inserted through clips?
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Old 11-19-2019, 09:18 AM
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I was just able to remove the underside rubber boot. I attached a wire from underneath the plug to 19 and the other end to that negative ground point to where you jump start. I attached the scanner and again, no communication. Let me check for the continuity. I also need to find a diagram of all the grounding points in the car and start checking them too.
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Old 11-21-2019, 12:17 PM
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Still nothing. Took it to my mechanic. He checked all the fuses. All were fine. Still nothing. Even his scanner won't communicate. I have told him to remove the passenger seat and dry out everything under the carpet (the foam is wet). Is there any ground wire/points or modules under the passenger seat under the carpet? I'm out of ideas now. Was trying to reset the airbag light and that's how I found out that there was no communication.
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