The Other Caller's Voice cannot be Heard, is too Quiet, or Distorted: Procedure

CHECK CELLULAR PHONE
1. Check if the other caller's voice can be heard properly.
  OK
  
  The other caller's voice can be heard properly.
  
  HINT:
  
  The purpose of this step is to inspect the cellular phone when it is not connected to the vehicle.
NG → REPAIR OR REPLACE CELLULAR PHONE

OK: Go to next step
CHECK VOICE GUIDANCE FUNCTION
1. Check that voice guidance sounds can be heard from a front speaker.
  OK
  
  Sound from the audio system can be heard.
NG → See step 5

OK: Go to next step
CHECK SETTINGS
1. Display the "Call" screen.
  
  Fig 1: Identifying Call Screen Display
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check that the volume level is not set to low.
  OK
  
  The level is not set to low.
  TEXT IN ILLUSTRATION
  
  *a Example
NG → SET VOLUME TO HIGH

OK → See step 4
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to PROBLEM SYMPTOMS TABLE
GO TO "VOICE GUIDANCE DOES NOT FUNCTION" IN PROBLEM SYMPTOMS TABLE. Refer to PROBLEM SYMPTOMS TABLE