Inspection Procedure 1: No navigation screen is displayed. <Vehicles without Auto Stop & Go (AS&G) System>
caution
Before replacing the multivision display, ensure that the power supply circuit, the earth circuit, and the communication circuit are normal. (Check that the voltage is 10 V or more.)
COMMENTS ON TROUBLE SYMPTOM
When the ignition switch is turned to the ACC or ON position, if the screen is not displayed at all, the power supply circuit or multivision display may have a problem.
PROBABLE CAUSES
Malfunction of power supply circuit
Malfunction of multivision display
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III other system data list
Check the input signal of ACC relay.
Turn the ignition switch to the ACC position.
Item No.
Item name
Normal condition
Item 288
ACC switch
ON
OK: Normal condition is displayed.
Q.
Is the check result normal?
Go to Step 2
Refer to ETACS - Input Signal Procedure 1 "The ignition switch (ACC) signal is not sent to the ETACS-ECU" .
STEP 2. Check of short to power supply, short to earth, and open circuit in ACC line between multivision display connector and ETACS-ECU connector
Q.
Is the check result normal?
Go to Step 3.
Repair the connector(s) or wiring harness.
STEP 3. Voltage measurement at multivision display connector (+B2 terminal).
(1)Disconnect the connector, and measure at the wiring harness side.
(2)Check the voltage between the multivision display connector (+B2 terminal) and body earth. OK: System voltage
Q.
Is the check result normal?
Go to Step 5.
Go to Step 4.
STEP 4. Check of short to power supply, short to earth, and open circuit in +B2 line between fusible link and multivision display connector
Q.
Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
(1)Disconnect the connector, and measure at the wiring harness side.
(2)Check the continuity between the multivision display connector (GND terminal) and body earth. OK: Continuity exists (2 Ω or less)
(3)Check the continuity between the multivision display connector (GND2 terminal) and body earth. OK: Continuity exists (2 Ω or less)
Q.
Is the check result normal?
Go to Step 7
Go to Step 6
STEP 6. Check of open circuit in GND or GND2 line between multivision display connector and body earth
Q.
Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
Repair the connector(s) or wiring harness.
STEP 7. Retest the system
Check if the multivision display power is turned ON.
Q.
Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
Go to Step 2
Refer to ETACS - Input Signal Procedure 1 "The ignition switch (ACC) signal is not sent to the ETACS-ECU" 
.