have a 2001 ml320 when i take out the key from the ignition it continues to buzz until i shut the door .the remote will not lock the doors but the lock button on the console locks all the doors .when i go to open the doors with the remote they dont open .when i insert the key in the door the aslarm doesnt sound but the buzz as if the key is still in sounds .on the odometer there is a little icon that looks like wrenches and the numbers 2000 blinks then the mileage appears the steering wheel wont lock . i changed the batteries and synced the remote but this didnt help .a alarm guy says it might be the ignition module . any help