VW Amarok / Audi - PWM Radiator Fan - Brose 850W - PWM Frequency

Hi,

Does anybody here knows or knows someone who knows the PWM frequency of this radiator fan?

I also would need to know if this is a low side or high side signal.

I've wired the yellow wire into a switched 12v and in less than 10s the fan gets full speed. I'm almost certain that I'm missing the right PWM frequency so it is starting in fault mode.

B regards.

I don't know, but I'd try 100 Hz. Let us know how it goes.

Already tried 100hz either low side and high side.

What duty cycle are you running?

I’m trying from 0 to 90%

most pwm fans that we worked before works as follows:

when it gets 12v and doesnt have Any pwm, it gets in emergency mode and goes full Speed.

if it gets 12v and a Low Duty cycle (something from 0 to 15) it also enter in emergency mode and Goes full Speed.

so im trying to varies from 0 to 90 in various frequencies, either low side and high side.

That certainly makes sense. Any chance you can get your hands on a stock vehicle to scope it?