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.

Check the park switch in the console.

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.