any one know what color it is and what harness it is in already checked the forum and the web nothing gives this info.Found wire hooked it up to pink wire and the vehicle diagnostics still don’t work it displays message not functional. any ideas?

i apologize for posting twice my computor was messing up.

Dark green /white in the radio harness.

if u cant fing it u need to buy a speed pulse genarator ... alpine has one ... we ran in to the same problem...

yellow/black ECM, black 73 pin plug, pin 57

The ECM (Engine Control Module) is on the driver side fender, behind the headlight.

In my silverado, we didnt want to mess with running wires through the firewall, i think we are going to go with the generator as well.

In my silverado, we didnt want to mess with running wires through the firewall, i think we are going to go with the generator as well.

Ummm..your still going to have to go through the firewasll with the speed pulse generator wire....