The microphone is out of function
Read the instructions below then 
start the fault diagnostic procedure.
Symptom: The microphone is out of function.
 
  
 
 
  
   
    
     |  | The microphone is out of function | 
   
  
  
  
   Fault symptoms
  
  
   The microphone is out of function.
   
   
  
  
   Ringing up is possible, you cannot be heard but you can hear the caller.
   
   
   
    Conditions
   
  
  
   No trouble codes stored in the car for the current fault symptom.
   
   
   
    Checking the wiring harness
   
  
  
   Jiggle the wiring harness at several points and in different directions to detect intermittent breaks and short circuits. Check switches, connectors and crimp connections for oxidation, withdrawn pins and pin clamping force.