Wire identification mystery

[Spun-Cog Racing]

Can anyone please tell me what this wire harness is used for out of a 1992 c1500

 

[AK49BWL]

Cruise control module. The blue connector plugs into the module on the firewall, orange and black connectors into the convenience center, remaining connector goes to the switch unit on the blinker stalk.

 

[Spun-Cog Racing]

Thanks Mate, Cheers

 

[AK49BWL]

I almost forgot, there's one more little 1 or 2 pin black connector near the rubber grommet in the picture, there should be a mating connector for that somewhere up under the instrument panel. That might be where the cruise module gets its speed sensor reading from, but I don't fully remember.