V1 LNF BCM Side Wiring Confirmation

[Mayor West]

I'm debugging a possible self-induced wiring issue and am tackling my BCM first... I could use the help of someone with an LNF, or others I'm not certain it matters?

To help make things easier for anyone willing to help me confirm this, I will use the AllData pinout/mapping (Attached)
The AllData pictures are looking at the bottom of the plug, which is sort of confusing and disorientating to get around at first when looking at the colored wires on the opposite side.

Plug X1 - small plug on the bottom (has the fewest wires of the two smaller plugs)

• I CUT (and think I shouldn't have)
  • Pin #18 - Dark Green - Circuit 5060 - LOW SPEED GMLAN SERIAL DATA
    • I know we were supposed to cut one or two of these, but I want to confirm this is one of them
  • Pin #61 - Black - Circuit 1250 - GROUND (Originally went under the driver's seat)
    • I'm pretty sure I shouldn't have cut this...
• I KEPT (and think I shouldn't have)
  • Pin #51 Dark Green - Circuit 113 - WINDSHIELD WIPER SWITCH SIGNAL
    • No idea why I would have kept this?
  • Pin #57 - Brown - Circuit 253 - TRUNK RELEASE RELAY CONTROL
    • No idea why I would have kept this?

Plug X2 - small plug perpendicular to X1 (has the most wires of the two smaller plugs)

• I KEPT (and soldered these together)
  • Pin #69 Light Green - Circuit 66 - A/C Request Signal
  • Pin #71 Purple - Circuit 5234 - PASSENGER SEATBELT REMINDER
    • Both of these I have soldered together... I vaguely remember doing this per the videos but I thought it was intended for the dash display dimming... their wiring name doesn't make me confident that I got the right ones.

Thank you to anyone who can help me work through this!

I mapped the entire BCM wiring and compared my wires to the AllData schematics in a spreadsheet, if you're interested in seeing that (or using it for your own wiring) it's located here.

 

[Brian74]

I confirmed pin 61 to ground on my diagrams. CRITICAL! Definitely repin it and provide ground. That may very well be your auto headlight/start issue.

Without that ground, you’ve got a bunch of transistors on some internal bus full of stray electrons not knowing where the hell to go, since you’ve removed their path of least resistance. **** will just plain act weird..like auto headlights.

 

[Brian74]

The green low speed data line (for the Goblin) should only feed the TDM, instrument cluster and OBD2 connector from pin X2 38 of the BCM. If you noticed, it terminates at a junction plug. That one is critical.

You are saying you cut X1 pin 18 (which is the radio data side and shouldn’t matter. As you see, its in my own notes to cut it)

As far as the stuff you didn’t cut, none of that should make any difference as those are driver circuits.

 

[Mayor West]

I love you.

 

[Mayor West]

Confirmed the missing #61 ground solves the AUTO bcm issue, however it still won't start. At least that was positive progress.

 

[Mayor West]

Nevermind, I ran my tech2 over it and now it has idles under its own power. Poorly, loudly, slowly, but I got first start!