Diacom cable for GM

[Terryk]

There is an 8 transistor circuit inside. The read wire is for CE light
communication cars where the CE light is burnt out and not providing the
necessary pull up.

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> From: sfg <sfgent at ac.net>
> To: diy_efi at coulomb.eng.ohio-state.edu
> Subject: Diacom cable for GM
> Date: Monday, October 13, 1997 7:02 AM
> 
> I purchased the Diacom diagnostic interface (GM) kit back in '92. It
> runs under DOS and has been worth the $200 or so I spent on it.
> The supplied cable, which connects your RS232 to the ECU (ALDL) has a
> red wire for 12VDC input. Recently I discovered the system works with,
> or without the 12VDC connected. I had always assumed there were active
> components molded into one of the connectors; now I am wondering if its
> really just a hunk of wire, with connectors on each end. Anyone know?
> Steve