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Inspection Procedure 6: The high-beam indicator light does not illuminate.
 
 
cautionBefore replacing the ECU, ensure that the power supply circuit, the ground circuit and the communication circuit are normal.
 
 
 
 
TECHNICAL DESCRIPTION (COMMENT)
If the high-beam indicator does not illuminate normally, the harness in the CAN bus lines, connector(s), ETACS-ECU, or combination meter may have a problem.
 
 
TROUBLESHOOTING HINTS
  • The ETACS-ECU may be defective
  • The combination meter may be defective
  • The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector
 
 
DIAGNOSIS
STEP 1. Headlight (high-beam) check.
Check that the headlights (high-beam) illuminate/extinguish normally when the lighting switch is operated.
Is the check result normal?
Go to Step 2.
Refer to Inspection Procedure 2 "None of the high-beam headlights illuminate." .
 
STEP 2. Using scan tool (M.U.T.-IIISE), diagnose the CAN bus line.
(1)
cautionTo prevent damage to scan tool (M.U.T.-IIISE), always turn off the power supply mode of the electric motor switch before connecting or disconnecting scan tool (M.U.T.-IIISE).
Connect scan tool (M.U.T.-IIISE). Refer to "How to connect the Scan Tool (M.U.T.-IIISE) ."
(2) Press the electric motor switch to turn on the power supply mode.
(3) Diagnose the CAN bus line.
(4) Press the electric motor switch to turn off the power supply mode.
Is the CAN bus line found to be normal?
Go to Step 3.
Repair the CAN bus line (Refer to GROUP 54C - Diagnosis ).
 
STEP 3. Using scan tool (M.U.T.-IIISE), read the ETACS DTC.
Check if DTC is set in the ETACS-ECU.
Is the DTC set?
Troubleshoot the ETACS-ECU. Refer to .
Go to Step 4.
 
STEP 4. Using scan tool (M.U.T.-IIISE), perform special function.
Using scan tool (M.U.T.-IIISE), select "Test" from the special function of the combination meter. Execute the following item to check the high beam indicator. (Refer to Combination Meter )
  • Item 5: Illumination (AUTO)
  • Item 6: Indicator (AUTO)
Is the check result normal?
Go to Step 5.
Troubleshoot the combination meter. Refer to .
 
STEP 5. Retest the system.
Check that the high beam indicator illuminate normally.
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 ETACS-ECU.