Does anyone know what this does?

 

So you don't know. Thanks

 

You didn't give much of a hint, like what car/model, where you found it etc...
When checking the partnumber 12020004 that appears on it on gmpartsdirect.com, it comes up with a single hit:

Electrical - Abs components - Module - Malfunction indicator
W/traction control - 1997-99 1997 - 1999

Don't know how accurate that is though..


Ken

 

87 camaro

 

Dash harness

 

All these Camaro owners and nobody has a clue.

 

that board looks like the control board for the "check engine" light

 

your right, so what does it do? the ecm turns on the ses light by internaly grounding the circuit.

 

I think it makes sure the light gets set if the ECM loses power or is unplugged.

 

That makes sense thanks!! I'm in the process of tracking the wires down I'll let you know what I figure out.