W220 eis mcu2 problem

[rob h]

Hello Guys, W220

2155450008 eis 2x 1d69j inside.

Remote ok, ign Comes on.
Not start car.
New key, that i created did not turn ign.
Needed tot activated new key first, then ign on, not start.

Star diagnostic: no respons mcu2.
(Swapped it with a secondhand eis, star diagnostic: mcu2 fine?)

I opened eis, looks fine.
Any common problems with these?

Greetings Rob

[Manta1600]

Dry joint - heat with hot air and will work for some time

[lion0304]

Apply some flux with brush and hot air that is better.

[rob h]

So a overall hot air resoldering, or just around out the mcu2?

[immoneard]

No start means not cranking or Not cranking?

[rob h]

Not cranking,

[lion0304]

So a overall hot air resoldering, or just around out the mcu2?

Around MCU is enough. I don't remember if 220 has ribbon cable like as 210.

If there are ribbon cable, rosolder with iron tip.

[droidwayne65]

Had one of those give me no end of trouble, where it wouldn't crank, even though everything matched in the DAS modules, only to finally realize that a resistor close to one of the mcus was missing. Also inspect the flex pcb connections, close to the mcu.

[immoneard]

You also could have other problems then EZS, like bad Starter, no signal to starter.
It will be good to try to start direct at starter and see what happens.

[rob h]

Inspected ezs again, no visual problems or pieces missing.
I warmed up the mcu s in stages,
Pressed the components and ribbon
Diagnostic, no changes, and still no crank.

Programmed a different ezs, and car is fine now. So the car is fine itself.
So i am nothing yet giving up, on trying to find the exact problem with the org eis.

Did not resoldered anything yet, will see what owner wants to do with this car.
I want to spend some more time, with the old eis, and learn from it.

Thank you guys,