PWM radiator fan controller

[AEH]

Rather that start a new thread I'll resurrect this one. I guess it's my turn in the barrel: I cant get my fans to run in pwm.



69 Camaro, LSA Crate Engine, 4L80 with both Connect & cruise harnesses (trans & Engine).
Production E67 ECM from a 2009 CTSV.

I can set control to Descrete and command Fan 1 to ON and pin J3-49 goes to ground so I know my wiring is right.
I can jump the PWN input (J3-49) to ground (rapidly) and my fans comes on and runs so I know the controller is working and the fans are good.

Ive tried 128hz,110hz, 100hz and 20hz with no luck, Changed the Desired vs state table to all ones, changed everything I can think of to try and still no fans. I have read thru all 6o+ pages of a similar thread (lou's change) on lateral G and just about every thread on the topic I can find. I ordered a cheap oscilloscope from amazon that will arrive this weekend so I can test it and see if Im getting a pwm signal out.

I know from reading it's kinda split between people that have done it successfully right out of the box and those who got to the point of pulling their hair out. I'm squarely in that second group, and I would appreciate any insight that anyone can offer.


Set Fan control = PWM Electric
Fans = 1

E67 Pinouts
AC Pressure Sensor
J3-21 (ground)
J3-37 (5V)
J3-57 (AC pressure signal)
J3-49 PWM output

PWM Fan Control Module -
1) Fan (-)
2) battery (-)
3) Battery (+) fused
4) Fan (+)
6) PWM output from ECM (J3-49)