Mystery Dash/Steering Column Ground Wire

[SuspiciousPizza]

1989 GL SPFI

Been slowly getting my interior back together and I unfortunately forgot to take a photo of this wire's routing before removing it.

I cannot find this wire in any diagrams in my parts catalog nor my FSM. It's not the radio ground wire that goes from behind the dash to the mount near the shift boot, that's in place.

It's too short to really go anywhere except the ECU mount, but the ECU doesn't ground through the case, or am I incorrect? 

Also I'm not 100% sure the one end mounts to the steering column, but I remember the wire being located in this general area.

Your view is of the ECU mount area from the driver's side.

Thanks!

:]