You are correct, it sat for a month with battery disconnected. If I hold the remote's button down for 5 secs they both light up a red LED. (as the manual says to test the remote) Is that not a complete remote test?

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1996 E300D
1996 E320 Wagon 4MATIC
2003 Jetta TDI- GLS, 5-spd
1997 Passat TDI
2002 F350 Crew cab 4x4 Powerstroke
Jacobsen HR 15' cut ZTR w/ 80 HP Perkins diesel
Hustler 6' front deck with 28HP Kubota diesel