thought I would see if someone has an answer. I am wiring my M4 and the manual shows no SW term in the hdlp diagram but both the early and late hdlp switches I have; have a SW term. The complete harness from my M16 is on the shop floor. It has a late hdlp switch and the only wire I cannot trace as it was cut at some point previous is the wire from the TT post. Obviously in the manual this goes to the term strip on the firewall but not so on the take out harness this wire runs somewhere under the dash not thru the loomed groups of wires thru the firewall. The SW wire on the take out harness goes thru the firewall to the junction strip.
Any thoughts??