Just bought this 2004 Tahoe AWD LT. Has all options excluding auto leveling suspension (premium smooth ride instead). Not a lot of these things work anymore.
The truck needed all brake lines when I got it. Installed Dorman brake line kit for stabilitrack vehicles. New calipers all around, everything bled out nicely. Next I turned to the cluster. Nothing here was working. Removed and "rebuilt" the cluster (re flowed most solder joints for resistors and voltage regulators), bench tested ok. Still nothing in the vehicle. No power at connector. This is when I found 4 broken wires under the under hood fuse box. Fixed these and everything is back to working order, or so I thought.
I have ELM327 device that would not connect to the truck. PIN 2 is showing ground. This should be network wire, not ground. Started digging deeper, splice pack sp205 is showing ground at PIN A and H. PIN A has two wires, 1 orange, 1 pink. Orange goes to radio, pink goes to SP207 and 5 more modules (have not located this splice pack yet). PIN H goes to splice pack SP206? The font is odd in my pdf so I cant read it well. This slice pack goes to 4 modules. I have also not dug into this splice pack yet. This is where I kind of stopped as this is becoming more work than I thought.
Now for what I find odd. With my DDM (driver door module) plugged in I cannot read codes/ communicate with the truck via OBD. as soon as I unplug the DDM I can communicate with the truck no problem. I followed some instructions from @TJBaker57 and my scanner is showing something like 500 codes. On my cheapo scan tool its showing just a P0420 code that comes and goes.
The truck needed all brake lines when I got it. Installed Dorman brake line kit for stabilitrack vehicles. New calipers all around, everything bled out nicely. Next I turned to the cluster. Nothing here was working. Removed and "rebuilt" the cluster (re flowed most solder joints for resistors and voltage regulators), bench tested ok. Still nothing in the vehicle. No power at connector. This is when I found 4 broken wires under the under hood fuse box. Fixed these and everything is back to working order, or so I thought.
I have ELM327 device that would not connect to the truck. PIN 2 is showing ground. This should be network wire, not ground. Started digging deeper, splice pack sp205 is showing ground at PIN A and H. PIN A has two wires, 1 orange, 1 pink. Orange goes to radio, pink goes to SP207 and 5 more modules (have not located this splice pack yet). PIN H goes to splice pack SP206? The font is odd in my pdf so I cant read it well. This slice pack goes to 4 modules. I have also not dug into this splice pack yet. This is where I kind of stopped as this is becoming more work than I thought.
Now for what I find odd. With my DDM (driver door module) plugged in I cannot read codes/ communicate with the truck via OBD. as soon as I unplug the DDM I can communicate with the truck no problem. I followed some instructions from @TJBaker57 and my scanner is showing something like 500 codes. On my cheapo scan tool its showing just a P0420 code that comes and goes.