FOR TRACK ONLY
Hi,
Looking for some help, on the road I want it active however for Track Days, looking to Disable the DHS on my Mk3.75.
Is there a way on disabling it through a odb reader or Forscan so it can just be switched back on or is it only achieved by resistors?
Many Thanks
I don’t know the answer, but I’m pondering whether you could just disconnect the bangers and put up with the warning light for a track day? I guess the risk of triggering the sensor would still be there, but at least you wouldn’t need a new bonnet.
I intend to take mine to Castle Combe again , and you do see the occasional hare there, so I’m interested in the answer.
This thread may prove useful/of interest:
There is a company that will reset the DHS module.
My understanding of the system is the module records the data that activated the system. So although disabling the activators may save the bonnet the module may think the system has been activated and may still need resetting. I don’t think this can be done via the OBD port using the MDS.
Yes there is the outstanding question of what would happen to the module, if there was a circumstance of the system triggering even if the actuators were disabled 
My understanding is the same as yours, that the module would need specialist attention if something did happen.
At least that would leave you with less parts to replace, if something untoward did happen on track.
Disconnecting the charges will stop the system blowing the bonnet. The reason people fit resistors is to turn off the light on the dash.
As you say you want the system active for road use I’d suggest it’s best not to fit resistors. If the light is off then it would be too easy to forget to reconnect after a track day.
I’m sure some people have added resistors and use the car in this way on the road. In practice it would probably never cause a problem. However in the case of an accident involving pedestrian injury it would be very bad for all. A pedestrian more seriously injured or killed due to the owner having deactivated a manufacturer fitted safety feature doesn’t bear thinking about.
What does seem crazy to me is that the American market cars don’t have this feature. Considering how they demanded huge bumpers on cars for pedestrian safety among other things it doesn’t add up.
Thing is if a mk3.5 hits a pedestrian the bonnet does not blow up.
Think it was introduced on the 3.75.
Yes it was