Convertible - Control Module Replacement Caution

9213mercedes01

MB-NET ADMINISTRATIVE MESSAGE
DECEMBER 17,1991
MESSAGE # 537


TO: ALL DEALER SERVICE MANAGERS

CC: REGIONAL PARTS/SERVICE MANAGERS MBNA FIELD PERSONNEL PDC MANAGERS


SUBJECT: GROUP 77 - UNNECESSARY REPLACEMENT OF
SOFT TOP CONTROL UNITS:


WE HAVE RECEIVED MANY R129 SOFT TOP CONTROL UNITS THAT HAVE NO DEFECT. THE CONTROL UNIT CAN BECOME INOPERATIVE IF A LARGE NUMBER OF FAILURE CODES ARE STORED IN MEMORY, SUCH AS AFTER TESTING WORK, LOW BATTERY VOLTAGE, ETC. BEFORE REPLACING ANY SOFT TOP CONTROL UNIT, ERASE "ALL" FAILURE CODES AND RE-TEST THE SYSTEM. IF NO IRREGULARITIES ARE NOTED, THE CONTROL UNIT IS NOT DEFECTIVE. IF THE CONTROL UNIT WAS FOUND TO BE DEFECTIVE, PLEASE INDICATE EXACT SYMPTOMS AND FAULT CODES IN THE "DEALER TEXT AREA" OF THE WARRANTY CLAIM.