Got another display unit. Original part number is 2108302385. I replaced with 2108300585. The recirc red light came on which tells me I need to modify the P1 and P2 values.

Here is the problem. The procedure, left Hi, righ Lo then rest/ignition is not working. I cannot get the p1 and p2 to show up.

What can I do? bring it to an indy to adjust it with SDS? or is it a part that cannot work?

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2008 S550
2010 GLK350
1997 E420 (retired)
2005 CLK500 (retired)