Whats the little computer above the ecu?

[Lof8]

I was taking out the engine harness for my 24v swap and noticed a little computer mounted above the ecu. What is it?
thanks

[Jean]

Probably an Idle Control Unit? I forgot if cruise control box is above the ecu or on the other side/driver side/near firewall.

[AndrewBird]

ABS computer maybe? I think that is on the driver side though.

[lennon]

on my 86 and 84 its the idle control unit mounted by the ecu.

[Lof8]

well, this idle control unit has a little wire that connected into the m20 engine harness. I haven't looked too closely yet but I don't believe my s50 harness has a provision for the connection. Should it come out?
thanks

[Jean]

Newer cars (m20b25?/m30b35/m50/s50 etc) have the idle contorl circuit built into the ECU. But the early 318/325 cars had an an idle control unit on it's own.

The ABS computer is much bigger in size and it's on the driver's side.

[lennon]

Newer cars (m20b25?/m30b35/m50/s50 etc) have the idle contorl circuit built into the ECU. But the early 318/325 cars had an an idle control unit on it's own.

The ABS computer is much bigger in size and it's on the driver's side.

this is true. you wont need it

[Lof8]

thanks guys

[jlevie]

I don't, at the moment know what the box mounted to the dash above the DME on a 325i/is is, but it isn't an ICM. No M20B25 engined car ever had an ICM.

Now if you have an M20B27 engined car, it could be the ICM.

[Toms73NovaSS]

Box Directly above ecm is the cruse control, If you have a early 318 or 325e the idle control module is up there in its own recess but a bit more forward toward the firewall.

[Lof8]

hmm, car is an '87 325i and the box in question sits just above the ecu and slightly further away from the firewall.

an obselete icm should go, but a cruise control box should stay.

[Jean]

Take a picture of it or post PN from it and we'll confirm :)

Maybe it's something else completely, like an old alarm brain box...

[Lof8]

will do!

[Lof8]

[Lof8]

look at my pics :)