Originally Posted by MouSe
Still curious if anybody would have a wiring diagram for this circuit.
This request is posted in a Bonneville discussion, but the only vehicle mentioned is a 2004 Silverado. Are you wanting the pinouts for the Silverado? Or a Bonneville?
I suspect what you really want is the wire IDs for the control stalk, along with the troubleshooting steps for those circuits.
It sounds to me like you are missing one of the power leads if the stalk won't turn on the motor. The circuit in the motor uses a rubbing contact plate to supply power to the wipers when the other power is turned off, until that contact plate reaches the bare spot which is when the wipers stop.