PDA

View Full Version : E40 Tow/Haul mode input wire at E40?



ssvolvo
March 23rd, 2008, 09:55 PM
I'd like to have a switch so I can have a dragstrip tranny tune for the track Through the tow/haul option. My donor vehicle (GMC Envoy or Trailblazer) E40 ecm did not have this option. After doing some research I see that the BCM is part of the system. Also I see that a momentary ground is needed. My question is what pin of the ECM or TCM is grounded?
I have Alldata and just can't find a GM vehicle that uses an E40/T42 with Tow/Haul mode switch on the shifter stalk so I can pull up the wiring diagram.

Thanks, John