New controller not doing anything

[rhannink]

Hello,
I have built a LIN controller as shown in the schematic. I only use an mcp2003 e/p instead off an MCP2003B.
I have the Bekant desk plugged in with the original controller, next I remove the original controller an plug in the Arduino controller still with the Bekant desk powered on.

The desk does not respons to and button press. I see the Arduino Led lightning up when I press a button. I have also connected a logic analyser to the RX and TX pin (0 and 1) and I see LIN protocols going by. I think I even see LIN respons to ID 0x08 and LIN respons to ID 0x09.

And idea what i might be doing wrong or how I can do further debugging?

Gr. Remco

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[trainman419]

See #2 .