Inspection Procedure 3: The Headlamps Illuminate at Low-beam (High-beam does not Illuminate) regardless of the Lighting Switch Positions.


caution Whenever the ECU is replaced, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.

COMMENTS ON TROUBLE SYMPTOM



PROBABLE CAUSES



  • Malfunction of column switch
  • Malfunction of the lighting control sensor <Vehicles with auto lamp function>
  • Malfunction of the ETACS-ECU
  • Damaged harness wires and connectors

DIAGNOSIS PROCEDURE


STEP 1. M.U.T.-III diagnosis code



Q. Is the diagnosis code set?





STEP 2. M.U.T.-III other system diagnosis code



Q. Is the diagnosis code set?





STEP 3. M.U.T.-III data list




  • Headlamp switch to ON.
Item No.
 Item name
 Normal condition
Item 341
 Head lamp switch
 ON

  • Turn the lighting switch to the "AUTO" position <Vehicles with auto lamp function>.
Item No.
 Item name
 Normal condition
Item 348
 Head lamp switch (auto)
 ON
OK: Normal condition is displayed.

Q. Is the check result normal?







STEP 4. Check that the auto lamp function.



Q. Is the check result normal?





STEP 5. Retest the system



Q. Is the check result normal?