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Inspection Procedure 10: The LED headlight warning light illuminates.
 
 
cautionBefore replacing the ECU, ensure that the power supply circuit, the ground circuit and the communication circuit are normal.
 
 
 
 
TECHNICAL DESCRIPTION (COMMENT)
If the LED headlight warning light illuminates, the LED headlights, the related connectors, the ETACS-ECU or the combination meter may be defective.
 
 
TROUBLESHOOTING HINTS
  • Malfunction of the LED headlight(s)
  • Malfunction of the ETACS-ECU
  • Malfunction of the combination meter
  • Damaged harness wires and connectors
 
 
DIAGNOSIS
STEP 1. Check that the headlights operate.
Check that the headlights (low-beam) illuminate normally.
Is the check result normal?
Go to Step 2.
Troubleshoot the headlights. Refer to trouble symptom chart .
 
STEP 2. Retest the system.
Check whether the LED headlight warning light is off.
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 ).
Go to Step 3.
 
STEP 3. Retest the system
Substitute the ETACS-ECU with a known good one. Turn the headlights on by operating the lighting switch. Check whether the LED headlight warning light is off.
Is the check result normal?
Replace the ETACS-ECU.
Install the original ETACS-ECU, and replace the combination meter.