Multiplexing?

I was wondering when you do the whole passlock bypass and doorlocks through the one wire in the databus... Is it just sending a different resistance for the different tasks? Or is it putting out voltage ??   This would be interesting to find out.

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Tell the Snap-On guy I'm not here!

Serial data commands come to mind.............when you mention databus......

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Brcidd - Engineer That Does Remote Starter Installs on the side.

Brcidd is right.  These wires transfer data similar to the transponder receiver wires.  They're usually not meant to carry a data signal very far, but the fact that it's a serial communication (as opposed to a parallel communication) does provide for the data signal to transfer from a... say... truch ECU to the primary Body ECU on the firewall (under dash) without a problem.

These wires can't be tested with a DMM or any other type of tool because they do not carry voltage.

This is where factory OEM wiring diagrams come in very handy.  Expect to see more and more of this as automobile wiring technology advances.  I just hope that DEI and other manufacturer's can keep up with innovative products that will EASILY interface with these new data systems.

Here's to hopin'  

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2002 Toyota Sequoia Limited 2WD (Clifford G5 Avantguard 5 w/ 2 SmartWindows modules) - IT Engineer - NRA Life Member - LDS Return Missionary - Married for time AND ETERNITY - Eternally sealed family