# Controlling active grill motor/Actuator **URL:** \ **Category:** PMU\ **Created:** [June 21, 2024, 9:37am UTC](https://community.ecumaster.com/t/controlling-active-grill-motor-actuator/1671 "2024-06-21T09:37:29Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![ellisd](https://avatars.discourse-cdn.com/v4/letter/e/94ad74/32.png) [@ellisd](https://community.ecumaster.com/u/ellisd)\ **Post date:** [June 21, 2024, 9:37am UTC](https://community.ecumaster.com/t/controlling-active-grill-motor-actuator/1671/1 "2024-06-21T09:37:29Z")
I’m wanting to control a BMW active grille motor from a PMU 24. The motor has 3 wires which I believe are a common ground and then motor open and motor closed. I can’t seem to find out of they have limit switches built in so I’m working on the assumption that when the motor has hit its mechanical stop and the current starts to rise, this is what is used to cut power. How would I program the logic for this in the PMU? I obviously don’t want it constantly trying to motor against the stop and tripping to overcurrent limit. I was thing something along the lines, once “motor close” current \> xxxA it can’t be activated again until “motor open” current \> xxxA. Thanks in advance ---
**Author:** ![derUltraTT](https://avatars.discourse-cdn.com/v4/letter/d/ba8739/32.png) [@derUltraTT](https://community.ecumaster.com/u/derUltraTT)\ **Post date:** [June 21, 2024, 12:58pm UTC](https://community.ecumaster.com/t/controlling-active-grill-motor-actuator/1671/2 "2024-06-21T12:58:30Z")
I don’t think this motor works as u assume. More likely it is: ground/+12V/ activation signal(usually ground) Disconnected it is fixed in one position. Giving the right signal to the activation pin moves it to the endstop → no need to do a current limitation by urselfe…logic is inside the motor. ---
**Author:** ![ellisd](https://avatars.discourse-cdn.com/v4/letter/e/94ad74/32.png) [@ellisd](https://community.ecumaster.com/u/ellisd)\ **Post date:** [June 21, 2024, 2:25pm UTC](https://community.ecumaster.com/t/controlling-active-grill-motor-actuator/1671/3 "2024-06-21T14:25:21Z")
Ill be honest i have tested yet as ive ordered one to retrofit in another car. If its as you describe then it mske things much simpler. Thanks for the reply ---
**Author:** ![ellisd](https://avatars.discourse-cdn.com/v4/letter/e/94ad74/32.png) [@ellisd](https://community.ecumaster.com/u/ellisd)\ **Post date:** [July 18, 2024, 3:11pm UTC](https://community.ecumaster.com/t/controlling-active-grill-motor-actuator/1671/4 "2024-07-18T15:11:10Z")
Bit of a follow up on this and it looks like the actuator doesn’t have a switch pin to run the shutters. I’ve since discovered they work via LIN bus and there’s no way of controlling them without knowing how its programmed (the motor is some sort of 3 phase motor). I’ve found a similar unit which although still uses LIN bus it has a 2 coil stepper motor, so I was wondering if the PMU24 would have the capability to run the stepper motor directly trough some sort of PWM table? > **[Car Grille Active Shutter Motor Actuator For Ford Escape 2013-2019 GV4B-8476-AB...](https://www.ebay.co.uk/itm/386665380618?itmmeta=01J335VS43T1DX4PPCS1RVBNJT&hash=item5a070d7b0a:g:RxgAAOSwB8FlqcMV&itmprp=enc%3AAQAJAAAA4L54LYJJSkhkTbs%2BqQJCkB1DtN3w2Nvr%2B2E1JhXfFyLuBMA2GTykFyv0crZONurxVNV7PZpV0%2B9xLP8%2FHQKilq8mt00bncyc%2B0pPjbtOvX39%2B0%2BnG5H9EMbns4bQHbv0fd44EjtDeUoGLLWcWz0P37rV7jEuKNl3DLCgKU%2BgDKi9VxC%2Fckd1TSHxF88%2FKezlpSQrtW%2B8ZAFxUIfAcjYiMusOLLMRHwvGqeB2%2B2nc9Ht2PPE5abaj2GpOmag%2FCZNcx1xamxyfWjaMwNe%2FJFl84cBXeK2gpcDNm%2FTOk6VLlrgz%7Ctkp%3ABFBMkpLv5Zhk)** > > Grille Active Shutter Motor Actuator 6477R1003 For Ford Escape 2013-2019. Door Lock Actuator For Renault Kangoo Twingo Vauxhall Movano Nissan Interstar. Tailgate Trunk Boot Lid Switch Handle For BMW F22 F30 F33 F10 F25 # 51247463162. > **[Mercedes W176 W246 Air Con A/C Flap Control Stepper Motor Actuator A0999069800...](https://www.ebay.co.uk/itm/276048231742?itmmeta=01J335XDSK9Y4VMQBM6SEEYMBX&hash=item4045c1bd3e:g:y~MAAOSwWL9lA~SJ&itmprp=enc%3AAQAJAAAA0GHfdwWmomwQHRTBQFKcK%2FYq2wv%2B%2B3XhXiIXGqkgPIqRMbAapKKKkF7%2BcKmhOpVSNhAPkGGL4nTc23jEhdIqrV%2FYgWkEVDtalx3xaipIQsBvvFhswUj7We554ObbSTdfhFO34Z35mXgC5heF4exonUZHfs9D9xpOsHsle7yJPlVKmVT5qLCipGCIAvSwsLII0%2B8ygoEP6i9eQMDVrTAUfCaQpYflmh7b7xpP%2FvLEKmEeVrALPNt6xXVqEqZeTC99CK7%2Fss5yFpbzJ%2FGn%2BJue7Tk%3D%7Ctkp%3ABk9SR_Tc9eWYZA)** > > Part no: A0999069800. We will ALWAYS try our best to help. It is also possible to collect the item from UK warehouse. Genuine used OEM part. This item is used but is in good condition and is in full working order. ---
**Author:** ![derUltraTT](https://avatars.discourse-cdn.com/v4/letter/d/ba8739/32.png) [@derUltraTT](https://community.ecumaster.com/u/derUltraTT)\ **Post date:** [July 18, 2024, 4:15pm UTC](https://community.ecumaster.com/t/controlling-active-grill-motor-actuator/1671/5 "2024-07-18T16:15:45Z")
Interessting…but i think it is quite easy to reverse engineer the LIN communication for such a simple device…especially if it just has two states. But yes u need to be a bit familiar with this communication stuff. Anyhow…PMU has PWM outputs…so i think there is no problem with useing them directly for a motor. ---
**Author:** ![ellisd](https://avatars.discourse-cdn.com/v4/letter/e/94ad74/32.png) [@ellisd](https://community.ecumaster.com/u/ellisd)\ **Post date:** [July 18, 2024, 5:17pm UTC](https://community.ecumaster.com/t/controlling-active-grill-motor-actuator/1671/6 "2024-07-18T17:17:46Z")
The problem I have is I have no way of knowing what the messages/ commands are. If I had the car the actuator came off I could just attach a oscilloscope and command the motor to open/close and replicate the commands but unfortunately I don’t have the original codes to replicate.