Code No.B16A6 Turn-signal fuse blown

  • 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 .)


When the hazard warning lamp fuse is blown, the ETACS-ECU sets the diagnosis code No. B16A6.


With the diagnosis code not set, when the blown fuse of hazard warning lamp is detected three times consecutively, the ETACS-ECU sets the diagnosis code No. B16A3.



STEP 1. Fuse check

Check if the turn-signal lamp fuse is normal.

Q. Is the check result normal?

Go to Step 2.

Replace the turn-signal lamp fuse.

STEP 2. Check whether the diagnosis code is reset.

(1)Erase the diagnosis code.
(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
(3)Check if diagnosis code is set.

Q. Is the diagnosis code set?

Replace the ETACS-ECU.

The diagnosis is complete.