Door and trunk locks stopped working

Mercedes Benz S Class 2002 500 S 120000 miles
Door and trunk locks all stopped working, both via door buttons and key fobs. Key fob batteries are fine, alarm will arm/disarm. Found the main 20 amp fuse for the KeylessGo system under the rear seat and it is OK. That's about as far as I got.
PoolBoyTroy from United States 2 months ago  
PO
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