Inspection Procedure 13: None of the turn-signal lamps illuminate.


caution
  • Before replacing the ECU, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.
  • When the ETACS-ECU of vehicles without KOS is replaced, the encrypted code of the ignition key needs to be registered to the ETACS-ECU. (If the encrypted code is not registered, the engine cannot be started. Register the encrypted code as described in Immobilizer System - How to Register Key ID .)

COMMENTS ON TROUBLE SYMPTOM



PROBABLE CAUSES



  • Malfunction of column switch
  • 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 data list




  • Turn the ignition switch to the ON position.
  • Turn the turn-signal lamp switch to the left position.
Item No.
 Item name
 Normal condition
Item 254
 IG voltage
 System voltage
Item 343
 Turn switch left
 ON

  • Turn the turn-signal lamp switch to the right position.
Item No.
 Item name
 Normal condition
Item 344
 Turn switch right
 ON
OK: Normal conditions are displayed for all the items.

Q. Is the check result normal?







STEP 3. Retest the system



Q. Is the check result normal?