Locks- Central Locking System Diagnosis

91mercedes03

MB-NET ADMINISTRATIVE MESSAGE
NOVEMBER 20, 1991
MESSAGE # 479


SUBJECT: GROUP 80 - MODEL 124 CENTRAL LOCKING SYSTEM


IN CASES WHERE THE CENTRAL LOCKING IS INOPERATIVE FROM THE PASSENGER DOOR, AND THE COMPLETE DIAGNOSTIC MANUAL TESTS (INCLUDING THE PUMP AND ACTUATOR TESTS) FIND NO DEFECTS, IT IS POSSIBLE THAT THE CONVENIENCE CONTROL UNIT (N57, BENEATH LEFT REAR SEAT) IS AT FAULT. ONLY CONVENIENCE CONTROL UNITS MANUFACTURED BY HELLA ARE AFFECTED, AND ONLY VEHICLES WITHIN THE CHASSIS NUMBER RANGE B622595 TO B625438 ARE AFFECTED. IN ANY SUCH CASES, REPLACE N57 AND ERASE THE CENTRAL LOCKING PUMP'S FAILURE RECOGNITION BY REMOVING POWER FOR A MOMENT.