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PostPosted: Tue Nov 28, 2017 11:28 pm 
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Year and Trim: 2003 Pontiac Bonneville SSEI
From what I can gather...there is a Class 2 serial data splice pack that the OBDII port's Serial data line and the serial data line from the PCM (Blue connector #58/#59 (cant remember which right now)) runs into. I need to get to that to troubleshoot an issue, does anyone know exactly where it is located? :helpsmilie:
(My car, listed below)

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2003 Pontiac Bonneville SSEI
3.8L V6 SC, 180*T (Drilled),
GXP Tails, Interior Door handles, Trim pieces etc.
40th Aniv Grand Prix GTP Wheels (Very Shiny & Very Annoying :pukeleft: )
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PostPosted: Wed Nov 29, 2017 10:10 am 
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Joined: Mon May 19, 2008 6:04 pm
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Location: Browerville, MN
Year and Trim: 2004 GXP - plus a handful of other Bonnevilles
Here is the schematic for the serial data.

You can get these same diagrams and the entire factory service manual for free here: https://www.youtube.com/watch?v=5gKz4mKnv0w&t=29s


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2004 Bonneville GXP | White Gold Tricoat | custom built supercharged 3800 hot rod
2005 Town & Country Limited | Butane Blue Metallic | 270k | Family Hauler
2002 Ram 1500 Quad Cab Sport | Black| 190k | Official Bonneville Hauler
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PostPosted: Wed Nov 29, 2017 4:14 pm 
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Location: Alberta, Canada
Year and Trim: 2004 GXP, 2008 STS, 2008 DTS
GM has used a splice pack in some vehicles to link the class 2 serial data bus connections of several components, however this is not the case in the Bonneville. The Bonneville, for the most part, uses more of a "daisy chain" type configuration. One serial data line in, and another out to the next component (some exceptions apply) to form a big (for lack of a better work) "circle". This way, there is redundancy if the data bus becomes open at some point.

Modules that only have a single point of contact with the data bus include:

Data Link Connector (DLC) - Of course, not a "module".
Head-Up Display (HUD)
S-Band Receiver - XM Module (SDAR)
Memory Seat Module (MSM)
Driver Door Module (DDM)
Vehicle Communication Interface Module (VCIM)

Perhaps if you are more specific about your problem, we can offer better assistance.

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PostPosted: Wed Nov 29, 2017 9:14 pm 
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Joined: Sat Oct 28, 2017 10:00 pm
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Year and Trim: 2003 Pontiac Bonneville SSEI
I bought a used DHP and while I am familiar with Tuning, it seams after several hours of research on the matter on just about every 3800 forum I could find that there are so many "things" on the Serial bus on the later years that the DHP supports (03, 04, 05) that when the Tuner sends the "Shutup so I can write this information to the PCM" command that it gets interrupted as it starts to write, by other things on the bus responding "Hey, what was that, oh your trying to do what?"...which at best (what I had happen) makes the programmer error out with "unauthorized access" at worst it can Brick the PCM. I had read (guess it was a grand prix) that they used a splice pack somewhere under the dash or hood...but I see from the diagram that is not the case....looks like I might need to run a dedicated serial bus line between the DLC and the PCM to let the tuner talk direct without all the other chatter...basically an off-board programmer built in...guess it should be easy enough, just use a switch to switch between direct to PCM or normal mode....whats your take on my idea?

I should add that I know the programmer is communicating fine driver/software wise. I can do a full bin file download, read codes, case learn, etc...it just wigs out when I try to flash the ".bin" back to it. I have also verified the OSID of my file is supported by the DHP.

_________________
2003 Pontiac Bonneville SSEI
3.8L V6 SC, 180*T (Drilled),
GXP Tails, Interior Door handles, Trim pieces etc.
40th Aniv Grand Prix GTP Wheels (Very Shiny & Very Annoying :pukeleft: )
Image


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