I have had to replace two cable harnesses for seat belt in both front seat. connectors are being replaced in every s class due to more than frequent failure. mechanic has informed me that these connectors by not operating will cause safety restraint and airbags to not deploy in accident. consequently had to replace right front passenger child restraint sensor in a 2004 s500 mercedes 4matic due to failure also. both items as described are constantly being replaced in s-class vehicles due to failure. luckily i did not have an accident to find out the airbag system would not activate in a crash. *tr