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Inspection Procedure 4: Audio illuminations does not work normally.
 
 
cautionBefore replacing the multivision display ensure that the power supply circuit, the ground circuit and the communication circuit are normal.
 
 
TECHNICAL DESCRIPTION (COMMENT)
If the taillights illuminate, illumination signal is sent from the A/C control panel to the multivision display. This switches the illumination of the multivision display from day mode to night mode. If the mode is switched, the illumination signal line, the A/C control panel or the multivision display may be defective.
 
 
TROUBLESHOOTING HINTS
  • The multivision display may be defective
  • The A/C control panel may be defective
  • The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector
 
 
DIAGNOSIS
Required Special Tools:
  • MB991223: Harness Set
  • MB992006: Extra Fine Probe
STEP 1. Check the multivision display setting.
(1) Start the multivision display.
(2) Press "Settings" button to display the "Home" screen.
(3) Press "Display" button to display the "Settings" screen.
Does "Day&Night Mode" set to "Auto"?
Go to Step 2.
Set "Day&Night Mode" to "Auto."
 
STEP 2. Check the illumination.
When the taillight are turned on, check whether the illumination other than the multivision display is turned on.
Is the check result normal?
Go to Step 3.
Check the rear combination light troubleshooting (Refer to ).
 
STEP 3. Check A/C control panel connector C-216 and multivision display connector C-138 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Are A/C control panel connector C-216 and multivision display connector C-138 in good condition?
Go to Step 4.
Repair or replace the damaged component(s) (Refer to GROUP 00E, Harness Connector Inspection ).
 
STEP 4. Check the wiring harness between A/C control panel connector C-216 (terminal 18) and multivision display connector C-138 (terminal 29).
  • Check the communication lines for open circuit and short circuit.
Is the wiring harness between A/C control panel connector C-216 (terminal 18) and multivision display connector C-138 (terminal 29) in good condition?
Go to Step 5.
The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary.
 
STEP 5. Retest the system.
When the taillight illuminate, check that the illumination of the multivision display is switched from day mode to night mode.
Is the check result normal?
Replace the ETACS-ECU.
Replace the multivision display (Refer ).