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Speed signal to control doors auto lock


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Hello, 

I need help to find the signal that activates after some speed (I guess around 20km/h) is reached (for example seatbelt warning or ABS). I'm

planning to make a simple schematic to simulate manual press of door power switch once the speed is reached.

Thanks

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no such signal exists, you will need to use the VSS pulse (like a pwm) then work out the pulse for the desired speed, the lock output would also need to be a momentary pulse

this can be achieved with a car alarm or an Arduino with a simple script

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Hi, 

I took this speed pulse from dash clock connector, fiitted a wire from this connector to radio speed signal input in order to achieve a speed senzitive volume and it works like a charm.

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Thanks very much guys, where is this dash clock connector? In the instrument cluster (speedometer) or the clock that is above the media/navigation? Wondering what is this PWM signal used in the clock for? 

Otherwise PWM is good - just a simple LP filter and it becomes a DC voltage level for a certain speed. 

Thanks again for the fast replies. 

 

 

 

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Great, I would not like to disassemble the instrument panel. Thanks flash22.

 

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The vss is a square wave (5v/div, 20ms/div on the scope) the amplitude stays the same, but the wave form narrows as speed increases

 

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