B16A5

DTC B16A5: Turn-Signal Light (RH) Short Circuit

Turn-Signal Lights(RH) Circuit:

TROUBLE JUDGMENT
When the right wiring harness of turn-signal light is short circuited, the ETACS-ECU sets DTC B16A5.

TECHNICAL DESCRIPTION (COMMENT)
When the short circuit is detected three times consecutively, the ETACS-ECU sets the DTC B16A5.

TROUBLESHOOTING HINTS
- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector
- Malfunction of the ETACS-ECU

DIAGNOSIS

Required Special Tools:
- MB992006: Extra fine probe
- MB991223: Harness set
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: Vehicle Communication Interface (V.C.I.)
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A (Vehicles with CAN communication system)

STEP 1. Check headlight assembly (RH) connector A-57 [front], side turn-signal light (RH) connector A-02 [side], rear combination light (RH) connector F-06 [rear] for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Are headlight assembly (RH) connector A-57 [front], side turn-signal light (RH) connector A-02 [side], rear combination light (RH) connector F-06 [rear] in good condition?

YES : Go to Step 2.

NO : Repair or replace the damaged component(s).

STEP 2. Check ETACS-ECU connectors C-304 and C-311 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Are ETACS-ECU connectors C-304 [front or side] and C-311 [rear] in good condition?

YES : Go to Step 3.

NO : Repair or replace the damaged component(s).

STEP 3. Check the wiring harness between headlight assembly (RH) connector A-57 (terminal 3) [front], side turn-signal light (RH) connector A-02 (terminal 2) [side], rear combination light (RH) connector F-06 (terminal 2) [rear] and ETACS-ECU connector C-304 (terminal 16) [front or side] or C-311 (terminal 19) [rear].

NOTE: Also check intermediate connector D-11 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector D-11 is damaged, repair or replace the connector.

- Check the communication line for open circuit.

Q: Are the wiring harness between headlight assembly (RH) connector A-57 (terminal 3) [front], side turn-signal light (RH) connector A-02 (terminal 2) [side], rear combination light (RH) connector F-06 (terminal 2) [rear] and ETACS-ECU connector C-304 (terminal 16) [front or side] or C-311 (terminal 19) [rear] in good condition?

YES : Go to Step 4.

NO : The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary.

STEP 4. Using scan tool MB991958, Check whether the diagnostic trouble code is reset.

CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.







1. Connect scan tool MB991958. Refer to "How to connect scan tool." How to Connect the Scan Tool (M.U.T.-III)
2. Turn the ignition switch to the "ON" position.
3. Erase the DTC.
4. Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
5. Check if DTC is set.

Q: Is the DTC set?

YES : Replace the ETACS-ECU.

NO : The procedure is complete.