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 Multi-Center 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: Locating Connector C-06, Connector C-118 And Connector C-119

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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: Locating Connector C-06, Connector C-118 And Connector C-119

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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: Identifying Oscilloscope Probe And Oscilloscope

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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 MALFUNCTIONS " .

   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.