99 K2500 CCSB LY6 Swap

[clinebarger]

'09 LY6 P/N input diagram. The TCM/Internal range switch in the 6L90E sends a ground when the shifter is in Park or Neutral.

[clinebarger]

'99 K2500 starter relay diagram.

[clinebarger]

'05 2500 Starter relay diagram, Using the newer NSS like you have.

[clinebarger]

As a suggestion, Wire Circuit 806 of the '99 harness to pin 12 of the NBSS, And wire Circuit 1035 of the '99 harness to pin 1 of the NBSS, This will give you a working neutral safety using the newer NBSS & original '99 starter relay, And never mind the ECM controlling the starter relay.

[gmech]

Originally Posted by clinebarger

'09 LY6 P/N input diagram. The TCM/Internal range switch in the 6L90E sends a ground when the shifter is in Park or Neutral.

Thanks, but I am reusing the 99 4l80e. Just let me know where to send the check! I really mean that. I have more questions that I am sure you could answer or provide diagrams for. I'm really not as stupid as I seem. I troubleshoot hvac controls on a daily basis, and I try to search for the info online prior to asking.

I kid you not, I've not accomplished a darn thing today except give myself a headache and raise my blood pressure. I put the whole pnp/nss on hold and began to wire in the gmlan serial data wire to the obd2. Only to find the following. I am going off 09 express ecm and tcm pinouts I found on gm upfitter, using a 09 express harness. The tcm has gmlan (+)(-) on pins 6/7,15/19 and 37/38. 6/15 and 7/19 are jumpered together. 37/38 go to the ecm x1-27/28.

[clinebarger]

I know your not stupid, You going by Circuit Numbers tells me you have experience in wiring & reading diagrams.

Give me a few minutes, I guess you want the GMLAN diagrams first...Then we will concentrate on the NBSS wiring?

[clinebarger]

'09 Express 6.0L/4L80E GMLAN diagram.

[clinebarger]

How to wire it without all the other modules.....

[BR3W CITY]

Originally Posted by gmech

I'm really not as stupid as I seem.

I swear thats gotta be someone's famous last words