[Previous][Next]
Inspection Procedure 1: Power of the multivision display does not turn ON when the ignition switch is in the "ACC" position or "ON" position.
 
 
cautionBefore replacing the multivision display, ensure that the power supply circuit, the ground circuit and the communication circuit are normal.
 
 
OPERATION
When the ignition switch is in the ON or ACC position, the multivision display power can be turned ON. With the multivision display power ON, when the ignition switch is turned to the OFF position, the power for multivision display is also turned OFF.
 
 
TECHNICAL DESCRIPTION (COMMENT)
Provided that the audio diagnostic trouble code is not set, if the power for multivision display cannot be turned ON, the multivision display, or power supply circuit for multivision display may have a problem.
 
 
TROUBLESHOOTING HINTS
  • The multivision display 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. Using scan tool (M.U.T.-III), check data list.
(1)
cautionTo prevent damage to scan tool (M.U.T.-III), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-III).
Connect scan tool (M.U.T.-III). Refer to "How to connect Scan Tool (M.U.T.-III) ."
(2) Check the input signal of ACC relay.
  • Turn the ignition switch to the ACC position.
 
Item No.Item nameNormal condition
288ACC switchON
OK: Normal condition is displayed.
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 ETACS-ECU connector C-415, C-417 and multivision display connector C-138 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Are ETACS-ECU connector C-415, C-417 and multivision display connector C-138 in good condition?
Go to Step 3.
Repair or replace the damaged component(s) (Refer to GROUP 00E, Harness Connector Inspection).
 
STEP 3. Check the wiring harness between ETACS-ECU connector C-417 (terminal 1) and multivision display connector C-138 (terminal 30).
Check the power supply lines (battery power supply) for open circuit and short circuit.
noteAlso check intermediate connector C-127, C-128, joint connector C-149 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-127, C-128, joint connector C-149 is damaged, repair or replace the connector as described in GROUP 00E, Harness Connector Inspection.
Is the wiring harness between ETACS-ECU connector C-417 (terminal 1) and multivision display connector C-138 (terminal 30) in good condition?
Go to Step 4.
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 4. Check the power supply circuit to the multivision display. Measure the voltage at multivision display connector C-138.
(1) Disconnect the connector, and measure at the wiring harness-side connector.
(2) Measure the voltage between terminal 21 and ground.
OK: Battery positive voltage
Is the measured voltage battery positive voltage?
Go to Step 6.
Go to Step 5.
 
STEP 5. Check the wiring harness between ETACS-ECU connector C-415 (terminal 9) and multivision display connector C-138 (terminal 21).
Check the power supply lines (battery power supply) for open circuit and short circuit.
noteAlso check intermediate connector C-127, joint connector C-231 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-127, joint connector C-231 is damaged, repair or replace the connector as described in GROUP 00E, Harness Connector Inspection.
Is the wiring harness between ETACS-ECU connector C-415 (terminal 9) and multivision display connector C-138 (terminal 21) in good condition?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
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 6. Check the ground circuit to the multivision display connector. Measure the resistance at multivision display connector C-138.
(1) Disconnect multivision display connector C-138, and measure the resistance available at the wiring harness side of the connector.
(2) Measure the resistance between multivision display connector C-138 terminal 40 and ground.
OK: The resistance should be 2 ohms or less
Is the check result normal?
Go to Step 8.
Go to Step 7.
 
STEP 7. Check the wiring harness between multivision display connector C-138 (terminal 40) and grounding connector C-01 (terminal 11).
Check the ground wire for open circuit.
noteAlso check joint connector C-108 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If joint connector C-108 is damaged, repair or replace the connector as described in GROUP 00E, Harness Connector Inspection.
Is the wiring harness between multivision display connector C-138 (terminal 40) and grounding connector C-01 (terminal 11) in good condition?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
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 8. Retest the system.
Check if the multivision display power is turned ON.
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 (Refer to ).