Connecting rear window defroster to interior motion sensor - AN80.50-P-0100-05A

Model 210.2 as of 01.03.97 with code 551a (ATA), retrofitted 

1. Find black (sw) lead (2) for rear window defroster (R1) in rear area of right cable duct.
2. Separate lead (2) and connect black (sw) lead (1) for ATA/TS wiring harness.
   Fig 1: Identifying Rear Window Defroster Lead

   Courtesy of MERCEDES-BENZ OF NORTH AMERICA.