Inspection Procedure
1: Power is not turned ON when the power switch is turned ON.
caution |
Whenever the multivision display
is replaced, ensure that the power supply circuit and the earthing 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. Voltage measurement at multivision display connector
(ACC terminal)
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(1)Disconnect the connector, and measure at the wiring harness side.
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(2)Turn the ignition switch to the "ACC" position.
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(3)Check the voltage between the multivision display connector (ACC terminal) and
body earth. OK: System voltage
|
Q.
Is the check result normal?
YES
: Go to Step 5.
NO <Vehicles without KOS>
: Go to Step 2.
NO <Vehicles with KOS>
: Go to Step 3.
STEP 2. Check of short to power supply, short to earth, and open circuit
in ACC line between ignition switch (ACC) and multivision display connector
Q.
Is the check result normal?
Refer to Inspection Procedure "Malfunction of the ignition switch power supply
system"
.
Repair the connector(s) or wiring harness.
STEP 3. Check the M.U.T.-III Diagnosis code for other systems
Check that the KOS&OSS-ECU sets a diagnosis code.
Q.
Is the diagnosis code set?
Diagnose the KOS&OSS-ECU. Refer to GROUP 42B, Troubleshooting
.
Go to Step 4.
STEP 4. Check of short to power supply, short to earth, and open circuit
in ACC line between ACC relay 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
).
Repair the connector(s) or wiring harness.
STEP 5. Voltage measurement at multivision display connector (+B
terminal)
|
(1)Disconnect the connector, and measure at the wiring harness side.
|
|
(2)Check the voltage between the multivision display connector (+B terminal)
and body earth. OK: System voltage
|
Q.
Is the check result normal?
Go to Step 7.
Go to Step 6.
STEP 6. Check of short to power supply, short to earth, and open circuit
in +B line between fusible link and multivision display connector
Q.
Is the check result normal?
Intermittent malfunction is suspected (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. Resistance measurement at multivision display connector (GND
terminal)
|
(1)Disconnect the connector, and measure at the wiring harness side.
|
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(2)Measure the resistance between the multivision display connector (GND terminal)
and body earth. OK: Continuity exists (2 Ω
or less)
|
Q.
Is the check result normal?
Go to Step 9.
Go to Step 8.
STEP 8. Check of open circuit in GND line between multivision display
connector and body earth
Q.
Is the check result normal?
Intermittent malfunction is suspected (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 9. Retest the system
Check if the multivision display power is turned ON.
Q.
Is the check result normal?
Intermittent malfunction is suspected (Refer to GROUP 00 -
How to Use Troubleshooting/Inspection
Service Points -
How to Cope with Intermittent Malfunction
).
Replace the multivision display.