INSPECTION PROCEDURE 4: On the Audio Screen, "E" cannot Proceed to Next Screen.: Diagnosis

Required Special Tools: 

• MB991223: Harness Set
• MB992006: Extra Fine Probe

1. STEP 1. Check of the display. 

   Q: Is "E" displayed? 

   YES :  Go to Step 2.

   NO :  Go to  Step 4.

   Fig 1: Checking For "E" On Display

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2. STEP 2. Check radio and CD player with CD changer connector C-119 < Vehicles with audio amplifier > or radio and CD player connector C-118 < Vehicles without audio amplifier > and multi-center display unit connector C-06 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

   Q: Is radio and CD player with CD changer connector C-119 < Vehicles with audio amplifier > or radio and CD player connector C-118 < Vehicles without audio amplifier > and multi-center display unit connector C-06 in good condition? 

   YES :  Go to Step 3.

   NO :  Repair or replace the component(s). Refer to HARNESS CONNECTOR INSPECTION . Then go to  Step 1.

   Fig 2: Identifying C-06, C-118 And C-119 Connector Terminals

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3. STEP 3. Check the wiring harness between radio and CD player with CD changer connector C-119 (terminal 27, 28, 38 and 39) < Vehicles with audio amplifier > or radio and CD player connector C-118 (terminal 21, 22, 26 and 27) < Vehicles without audio amplifier > and multi-center display unit connector C-06 (terminal 7, 8, 9 and 10). 

   Q: Is the wiring harness between radio and CD player with CD changer connector C-119 (terminal 27, 28, 38 and 39) < Vehicles with audio amplifier > or radio and CD player connector C-118 (terminal 21, 22, 26 and 27) < Vehicles without audio amplifier > and multi-center display unit connector C-06 (terminal 7, 8, 9 and 10) in good condition? 

   YES :  Go to Step 4.

   NO :  Repair the wiring harness and then go to  Step 1.

   Fig 3: Identifying C-06, C-118 And C-119 Connector Terminals

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4. STEP 4. Using the oscilloscope, check the M-BUS line. 
   1. Connect the multi-center display unit connector C-06 and radio and CD player with CD changer connector C-119 < Vehicles with audio amplifier > or radio and CD player connector C-118 < Vehicles without audio amplifier >.
   2. Connect the oscilloscope probe to terminal 10 of the multi-center display unit connector by backprobing.
   3. Turn the ignition switch to "ACC" position.
   4. Operate each of the radio and CD player with CD changer switches < Vehicles with audio amplifier > or radio and CD player switches< Vehicles without audio amplifier >.

   Q: Is a wave pattern displayed? 

   YES :  Go to Step 5.

   NO :  Replace multi-center display unit and then go to  Step 6.

   Fig 4: Connecting Oscilloscope Probe To Terminal 10 Of Multi-Center Display Unit Connector

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5. STEP 5. Retest the system 

   Confirm that the audio operation screen is displayed normally.

   Q: Is the check result satisfactory? 

   YES :  Intermittent malfunction (Refer to How to Use Troubleshooting/Inspection Service Points - HOW TO COPE WITH INTERMITTENT MALFUNCTION .

   NO :  Replace radio and CD player with CD changer < Vehicles with audio amplifier > or radio and CD player < Vehicles without audio amplifier > and then go to step 6.

6. STEP 6. Retest the system 

   Confirm that the audio operation screen is displayed normally.

   Q: Is the check result satisfactory? 

   YES :  The procedure is complete.

   NO :  Go to  Step 1.