Chevrolet Volt Coolant Pumps

I reviewed Ampera manual and came to a page describing Coolant Pump Connector and PWM activation pin.
I applied 1kHz signal from makeshift 5V generator at 50% – 75% duty and pump responded and spooled up at low to medium speed.
Link to my experiments: https://leafdriveblog.wordpress.com/2018/12/28/pumps-and-fans/
Wires in connector need to be connected according to this picture.