Inspection Procedure 1: No Navigation Screen is Displayed.

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

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. Connector check: C-144 multivision display

Q. Is the check result normal?

	Go to Step 3.

	Repair the defective connector.

STEP 3. Voltage measurement at C-144 multivision display connector.

(1)Disconnect the connector, and measure at the wiring harness-side connector.

(2)Turn the ignition switch to the ACC position.

(3)Voltage between C-144 multivision display connector terminal No.14and the body earth
OK: System voltage

Q. Is the check result normal?

	Go to Step 5.

	Go to Step 4.

STEP 4. Check the wiring harness between C-144 multivision display connector terminal No.14 and C-315 ETACS-ECU connector terminal No.9

note

Prior to the wiring harness inspection, check intermediate connector C-139 and joint connectors C-02 <LHD> or C-46 <RHD>, and repair if necessary.

Check the power supply lines (battery power supply) for open circuit or short circuit.

Q. Is the check result normal?

	Go to Step 5.

	Repair the wiring harness.

STEP 5. Connector check: C-143, C-142 multivision display connector

Q. Is the check result normal?

	Go to Step 6.

	Repair or replace the damaged component(s).

STEP 6. Resistance measurement at C-144, C-143, C-142 multivision display connector.

(1)Disconnect C-144 multivision display connector, and measure the resistance available at the wiring harness side of the connector.

(2)Check the continuity between terminal 9 and body earth.
OK: Continuity exists (2 ohms or less)

(3)Disconnect C-143 multivision display connector, and measure the resistance available at the wiring harness side of the connector.

(4)Check the continuity between terminal 25 and body earth.
OK: Continuity exists (2 ohms or less)

(5)Disconnect C-142 multivision display connector, and measure the resistance available at the wiring harness side of the connector.

(6)Check the continuity between terminal 65 and body earth.
OK: Continuity exists (2 ohms or less)

Q. Is the check result normal?

	Go to Step 8.

	Go to Step 7.

STEP 7. Check the wiring harness between C-144 multivision display connector terminal No.9 or C-143 multivision display connector terminal No.25 or C-142 multivision display connector terminal No.65 and body earth.

note

Prior to the wiring harness inspection, check intermediate connector C-133 or C-139, and repair if necessary.

Check the earth wires for open circuit.

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 wiring harness.

STEP 8. Voltage measurement at C-144 multivision display connector.

(1)Disconnect the connector, and measure at the wiring harness-side connector.

(2)Voltage between C-144 multivision display connector terminal No.17 and the body earth
OK: System voltage

Q. Is the check result normal?

	Go to Step 10.

	Go to Step 9.

STEP 9. Check the wiring harness between C-144 multivision display connector terminal No.17 and C-317 ETACS-ECU connector terminal No.1

note

Prior to the wiring harness inspection, check intermediate connector C-139, and repair if necessary.

Check the power supply lines (battery supply) for open circuit or short circuit.

Q. Is the check result normal?

	Go to Step 10.

	Repair the wiring harness.

STEP 10. Voltage measurement at C-143 multivision display connector.

(1)Disconnect the connector, and measure at the wiring harness-side connector.

(2)Voltage between C-143 multivision display connector terminal No.21 and the body earth
OK: System voltage

Q. Is the check result normal?

	Go to Step 12.

	Go to Step 11.

STEP 11. Check the wiring harness between C-143 multivision display connector terminal No. 21 and C-317 ETACS-ECU connector terminal No.1

note

Prior to the wiring harness inspection, check intermediate connector C-133, and repair if necessary.

Check the power supply lines (battery supply) for open circuit or short circuit.

Q. Is the check result normal?

	Go to Step 12.

	Repair the wiring harness.

STEP 12. 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 ).

	Replace the multivision display.