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



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-101, C-104 multivision display, C-415 ETACS-ECU connector

Q. Is the check result normal?
Go to Step 3.
Repair the defective connector.

STEP 3. Voltage measurement at C-104 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-104 multivision display connector terminal No.21 and 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-104 multivision display connector terminal No.21 and C-415 ETACS-ECU connector terminal No.9

  • Check the power supply lines (battery power supply) for open circuit and short circuit.
note Prior to the wiring harness inspection, check joint connector C-231 and intermediate connector C-127 <Except vehicles for Russia>, and repair if necessary.

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 5. Voltage measurement at C-101, C-104 multivision display connector.
(1)Disconnect the connector, and measure at the wiring harness-side connector.
(2)Voltage between C-101 multivision display connector terminal No.64 and the body earth
OK: System voltage
(3)Voltage between C-104 multivision display connector terminal No.30 and the body earth
OK: System voltage

Q. Is the check result normal?
Go to Step 7.
Go to Step 6.

STEP 6. Check the wiring harness between C-101 multivision display connector terminal No.64 or C-104 multivision display connector terminal No.30 and fusible link (36) <Petrol> or (38) <Diesel>

  • Check the power supply lines (battery power supply) for open circuit and short circuit.
note Prior to the wiring harness inspection, check joint connector C-231 <Vehicles for Russia> and intermediate connector C-127 <Except vehicles for Russia> and C-128 <Except vehicles for Russia>, ETACS-ECU connector C-406 and C-417, and repair if necessary.

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 7. Connector check: C-110 multivision display connector

Q. Is the check result normal?
Go to Step 8.
Repair or replace the damaged component(s).

STEP 8. Resistance measurement at C-101, C-104, C-110 multivision display connector.
(1)Disconnect C-101 multivision display connector, and measure the resistance available at the wiring harness side of the connector.
(2)Check the continuity between terminal 68 and body earth.
OK: Continuity exists (2 Ω or less)
(3)Disconnect C-104 multivision display connector, and measure the resistance available at the wiring harness side of the connector.
(4)Check the continuity between terminal 40 and body earth.
OK: Continuity exists (2 Ω or less)
(5)Disconnect C-110 multivision display connector, and measure the resistance available at the wiring harness side of the connector.
(6)Check the continuity between terminal 44 and body earth.
OK: Continuity exists (2 Ω or less)

Q. Is the check result normal?
Go to Step 11.
Go to Step 9.

STEP 9. Connector check: C-01 earth joint connector

Q. Is the check result normal?
Go to Step 10.
Repair or replace the damaged component(s).

STEP 10. Check the wiring harness between C-101 multivision display connector terminal No.68 or C-104 multivision display connector terminal No.40 or C-110 multivision display connector terminal No.44 and C-01 earth joint connector terminal No.11.
note Prior to the wiring harness inspection, check joint connector C-108, 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 11. 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.