Code No.B16A4 Blown Turn-signal Lamp (RH) Bulb


caution Before replacing the ECU, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.










DIAGNOSTIC FUNCTION



JUDGEMENT CRITERIA




  • With the diagnosis code not set, if there is a malfunction to the right turn-signal lamp bulb, the blown right bulb counter counts once when the illumination of hazard or turn-signal lamp (right side) is attempted.
  • If the blown right bulb counter reaches "3," the diagnosis code No. B16A4 is set.

PROBABLE CAUSES



  • Malfunction of turn-signal lamp bulb (right side)
  • Damaged harness wires and connectors
  • Malfunction of the ETACS-ECU

DIAGNOSIS PROCEDURE


STEP 1. Bulb check



Q. Is the check result normal?





STEP 2. Connector check: A-53 headlamp assembly (RH) connector, A-02 side turn-signal lamp (RH) connector and F-08 rear combination lamp (RH) connector


Q. Is the check result normal?





STEP 3. Resistance measurement at the A-53 headlamp assembly (RH) connector, A-02 side turn-signal lamp (RH) connector and F-08 rear combination lamp (RH) connector


(1)Disconnect the connector, and measure at the wiring harness side.
(2)Measure the resistance between the connector terminal of lamp which does not illuminate and the body earth.

  • Measure the resistance between the A-53 headlamp assembly (RH) connector terminal No. 6 and the body earth.
  • Measure the resistance between the A-02 side turn-signal lamp (RH) connector terminal No. 1 and the body earth.
  • Measure the resistance between the F-08 rear combination lamp (RH) connector terminal No. 1 and the body earth.
OK: Continuity exists (2 Ω or less)

Q. Is the check result normal?





STEP 4. Check the wiring harness between A-53 headlamp assembly (RH) connector terminal No. 6, A-02 side turn-signal lamp (RH) connector terminal No. 1 or F-08 rear combination lamp (RH) connector terminal No. 1 and the body earth.



  • Check the earth wires for open circuit.

Q. Is the check result normal?





STEP 5. Connector check: C-304 and C-311 ETACS-ECU connectors


Q. Is the check result normal?





STEP 6. Check the wiring harness between A-53 headlamp assembly (RH) connector terminal No. 3, A-02 side turn-signal lamp (RH) connector terminal No. 2 or F-08 rear combination lamp (RH) connector terminal No. 2 and C-304 ETACS-ECU connector terminal No. 16 or C-311 ETACS-ECU connector terminal No. 19.


note Before the wiring harness check, check the intermittent connector D-12 and joint connector D-24, and repair them if necessary.

  • Check the output lines for open circuit.

Q. Is the check result normal?





STEP 7. 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?