Wiring Diagram for BTSI solenoid

[Brian_D]

Does anyone have the actual wiring diagram for the Brake Transmission Shift Interlock (BTSI) solenoid for a '97 Blazer 4WD, 4.3L with console shift?
Intermittent problem with shifting out of Park - ignition switch in ON position and brake engaged. Appears BTSI is intermittently not getting power to activate solenoid and wanting to test with DVM.

[BlazerLT]

Check the park switch in the console.

[Brian_D]

I may be confused here but...
Ignition ON and brake pedal engaged (brake lights on), press button on shift selector to shift from park, button engages 1/4 and hear solenoid next to ignition switch activate (assumed this solenoid was the Park-Lock solenoid).
Disconnect wire harness from solenoid in console shift selector - now no Park-Lock solenoid activation, still no shift from Park, and when using temporary bypass on left-side of shift selector to shift from Park, cannot shift back into park - reconnect harness and can shift back to Park.
I realize this ckt uses the Ignition Switch, Brake Switch, Park-Lock solenoid, and Brake Transmission Shift Interlock solenoid. Wanting to test entire ckt.

thanks.