So yesterday I did some stuff and today I did some stuff.
Yesterday I went to one of those car cemetery places (?) and asked around. I wanted a unit that controls the parking sensors so I might get some idea how the signals from the controller to the sensor itself looked like. The guy working there began, all smart and old, and told me I needed the exact same sensors and all of them in order to get the system up and running. "What does he know?" thought the arrogant nerd. I ripped a module off one of the three car with them still on in the whole lot (no Toyota). This was from a BMW. I though I might get at least some good data, even though I didn't collect any of the sensors. I did however snip some cables so I don't have to work like a gorilla to measure and connect wires.
And like Dave says: Don't turn it on, take it apart! Only because I have no idea how to turn it on...
The unit and its guts:
http://gyazo.com/e396e37cc19665e3039fb83981fd312fCase text:
http://gyazo.com/3a8cbb193a6bfee4e0dc9caa3b5b3622Guts:
http://gyazo.com/05ec8b7287fffd7780138e3f17151944Today I did not blow up my scope, multimeter, powersupply and hopefully not the board itself. This is usually more luck than I am used to.
I started counting, something I should have done before I even got the thing. I counted all the way to 12. Three times(!!). Eliminating one plug for signal and power, I'm left with 24.
24pins / 2per sensor = 12 sensors. Uh oh! 24pins / 3per sensor = 8. UH OH!
http://gyazo.com/d0f467324b6ee7e5159f578d6a6e0bd1Looks like the hare I'm gutting is a rabbit!
No way in the pacific are the two types of sensors compatible...
Licking my wounds: "I can at least look at what this unit is sending out in terms of data." Wrong! Dead wrong!
After finding what I believe is +12V and GND inputs (using horrible methods of reengineering) I set the scope up to all three pins and hope for the best. Results: no español compatible muertos!
I got one steady +5V on one combination, but nothing indicating pulsing or traffic.
I'm thinking the next step is to look at what the unit is trying to send to the on-board computer for the car it was in. Hopefully something that can be readable.. My hopes for that working are so low I consider dropping it.
Is there any way to test if the board is healty?
Is there anything I can try?
Should I try to find a sensor that uses the 3 pins?
Should I drop the whole board and try something else?