[ Model - ECLIPSE CROSS / Year - 2018 ]
2018 / ECLIPSE CROSS / EC - Workshop Manual
54 -CHASSIS ELECTRICAL > 54A-CHASSIS ELECTRICAL > HEADLAMP > SYMPTOM PROCEDURES > THE LOW-BEAM HEADLAMPS ILLUMINATE WHEN THE LIGHTING SWITCH IS AT ANY POSITIONS OTHER THAN OFF.
Inspection Procedure 2: The headlamps (low-beam) illuminate regardless of the lighting switch positions. (High-beam does not illuminate)
 
 
caution
  • Before replacing the ECU, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.
 
 
 
 
COMMENTS ON TROUBLE SYMPTOM
If the headlamps illuminate only at low-beam regardless of the lighting switch position, the headlamp fail-safe function may be active.
 
 
PROBABLE CAUSES
  • Malfunction of column switch
  • Malfunction of the lighting control sensor
  • Malfunction of the ETACS-ECU
  • Damaged harness wires and connectors
 
 
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-IIISE CAN bus diagnostics
Use the M.U.T.-IIISE to diagnose the CAN bus lines.
Is the check result normal?
Go to Step 2.
Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting ).
 
STEP 2. M.U.T.-IIISE diagnosis code
Check if diagnosis code is set in the ETACS-ECU.
Is the diagnosis code set?
Troubleshoot the ETACS-ECU. Refer to .
Go to Step 3.
 
STEP 3. M.U.T.-IIISE other system diagnosis code
Check if diagnosis code is set in the ASC.
Is the diagnosis code set?
YES : Troubleshoot the ASC. Refer to .
Go to Step 4.
 
STEP 4. M.U.T.-IIISE other system diagnosis code
Check if diagnosis code is set in the LIN.
Is the diagnosis code set?
Refer to diagnosis code chart .
Go to Step 5.
 
STEP 5. M.U.T.-IIISE data list
Use the ETACS-ECU service data to check the signals related to the operation of auto lamp function.
  • Turn the lighting switch to the "AUTO" position.
 
Item No.Item nameNormal condition
22Headlamp switch (Auto)ON
OK: Normal condition is displayed.
Is the check result normal?
Go to Step 6.
NO : Troubleshoot the ETACS-ECU. Refer to Inspection Procedure 11 "The column switch signal is not received" .
 
STEP 6. Lighting control sensor check
Check the lighting control sensor (Refer to ).
Is the check result normal?
Go to Step 7.
Replace the lighting control sensor.
 
STEP 7. Retest the system
Check that the headlamps 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.