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The reverse inhibit solenoid is a safety feature which prevents an inadvertent shift into reverse at speeds above 5 km/h (3 mph). The system consist of the following components:
1. The powertrain control module (PCM).
2. The reverse inhibit solenoid.
With the ignition ON, battery voltage is supplied directly to the reverse inhibit solenoid. At forward speeds above 5 kp/h (3 mph) the PCM grounds the control circuit of the reverse inhibit solenoid. This energizes the solenoid and mechanically blocks the shift lever from going into the REVERSE position.
End quote
I stand corrected. I forgot the PCM controlling the ground circuit on the control side.