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Discussion in 'Electronics' started by XJguy, Dec 6, 2018.
Does anyone know how to disable ASR and keep it off without disabling ABS?
On some cars theres a snow chain/ ASR defeat switch.?
http://www.autolib.diakom.ru/CAR/Mercedes-Benz/1995/E320/SYSTEM WIRING DIAGRAMS/5410.pdf
http://www.autolib.diakom.ru/CAR/Mercedes-Benz/1995/E320/SYSTEM WIRING DIAGRAMS/5409.pdf
if you havn't got a switch may you could wire one in?
ps I think the guy in the video has a wiring/switch fault , but it illustrates what the action of the switch should do= switch of the ASR and illuminate the ASR warning light
I have the snowchain button, but it only defeats it partially and very briefly. I need to be able to shut it off totally and keep it off until I turn it back on.
It would appear that the switch alters the slip threshold to allow the wheels to spin a bit to drive out of snow rather than defeat the system completely as you say.
Unfortunately since both ABS and ASR share circuitry so it would appear that disabling one would switch off both! It might be posssible to downgrade the system to an ABS only system by swapping control units and a bit of rewiring but MB control units are essentially black boxes and don't know if anyone has tried this?
Apparently it can be done according to this . Its under Performance upgrades/ 4-1-06 - ASR Defeat Installation
Rik Johnsons Mercedes 500E
Yes for the V8 cars and for the newer cars it can, relatively easily. But so far I have not found anything for the pre 96 six cylinder cars.
I just had an idea, if I were to provide a constant voltage to the wire that sends the throttle position location signal to the ASR computer, the car won't know its accelerating, this might be enough to fool the ASR while still keeping the ABS fully functional.