Inspection Procedure 10: The auto lamp function does not work normally.


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










OPERATION



COMMENTS ON TROUBLE SYMPTOM



PROBABLE CAUSES



  • Malfunction of the lighting control sensor
  • Malfunction of the lighting switch
  • Malfunction of the ETACS-ECU
  • Damaged harness wires and connectors

DIAGNOSIS PROCEDURE


STEP 1. M.U.T.-III CAN bus diagnostics



Q. Is the check result normal?





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



Q. Is the diagnosis code set?





STEP 3. Check that the headlamps operate.



Q. Is the check result normal?





STEP 4. M.U.T.-III data list




  • Move the electric motor switch to the ON position.
Item No.
 Item name
 Normal condition
30
 IG SW (IG1) /Power SW(ON)
 ON
OK: Normal condition is displayed.

Q. Is the check result normal?





STEP 5. Connector check: B-07 lighting control sensor connector, B-318 ETACS-ECU connector


Q. Is the check result normal?





STEP 6. Check the wiring harness between B-07 lighting control sensor connector terminal No.1, 2, 3 and the B-318 ETACS-ECU connector terminal No.29, 28, 37.



  • Check the power supply lines, earth lines, and output lines for open circuit and short circuit.

Q. Is the check result normal?





STEP 7. Retest the system



Q. Is the check result normal?





STEP 8. Retest the system



Q. Is the check result normal?