What is this

I remove this Box from under the dashboard on the driver side of my 1993 Cadillac Fleetwood Brougham is this the ECM? if it's not i would like to know what it is and where is the ECM located

My Cadillac won't start i get i get no control signal on slot #85 where pin 85 of the relay goes in, at the fuse box under the hood.

https://i.postimg.cc/PLTFLXfJ/IMG-019.jpg (https://postimg.cc/PLTFLXfJ)

It there a label on one of the surfaces? Usually an ECM will have an 8-digit part number on the label.

Yeah it has an 8 digit number on the bottom side so how come this ECM only has one port to plug in the wires, just this yellow port, i seen others with two ports to plug in wires and they are bigger then this and they also have a chip then can be transferred to another with ECM with the same car year and model.

Around that time the GM ECM was transitioning to EEPROM/NVRAM topography.

I was curious about the part number since it will define what it is. It could be a body or passkey/security or otheraccessory module, etc.


it doesn't look like a typical ABS module, but Cadillac also had dynamic traction control in soem of these Fleetwoods, and having the part nuber would help a lot.

It is not a GM pcm, they are very different looking and had multiple ports.https://www.ebay.com/itm/For-1990-1993-Cadillac-DeVille-Electronic-Control-Unit-SMP-24242JB-1991-1992/392393604747?hash=item5b5c7b3e8b%3Ag%3Ab0wAAOSwa%7 EldXsiz%3Asc%3AFedExHomeDelivery%2112817%21US%21-1&fits=Year%3A1993%7CModel%3ADeVille%7CMake%3ACadill ac