B16A5

DTC B16A5: Turn-signal light (RH) short 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-56, side turn-signal light (RH) connector A-60 [fender type], door mirror assembly
(RH) connector E-28 [door mirror type], rear combination light (RH) connector D-09 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q. Are headlight assembly (RH) connector A-56, side turn-signal light (RH) connector A-60 [fender type], door mirror assembly (RH) connector E-28 [door mirror type], rear combination light (RH) connector D-09 in good condition?

YES Go to Step 2.
NO : Repair the damaged parts.
STEP 2. Check ETACS-ECU connectors C-304, C-311 and C-317 [door mirror type] for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q. Are ETACS-ECU connectors C-304, C-311 and C-317 [door mirror type] in good condition?

YES Go to Step 3.
NO Repair the damaged parts.
STEP 3. Check the wiring harness between headlight assembly (RH) connector A-56 (terminal No. 3), side turn-signal light (RH) connector A-60 (terminal No. 2) [fender], door mirror assembly (RH) connector E-28 (terminal No. 2) [door mirror type], rear combination light (RH) connector D-09 (terminal No. 3) and ETACS-ECU connector C-304 (terminal No. 16), ETACS-ECU connector C-311 (terminal No. 19) or ETACS-ECU connector C-317 (terminal No. 11).

Check the communication line for short circuit.

NOTE:
Also check intermediate connector C-113 [door mirror type] for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-113 [door mirror type] is damaged, repair or replace the damaged component(s) as described in Harness Connector Inspection Harness Connector Inspection.

Q. Are the wiring harness between headlight assembly (RH) connector A-56 (terminal No.
3), side turn-signal light (RH) connector A-60 (terminal No. 2) [fender], door mirror assembly (RH) connector E-28 (terminal No. 2) [door mirror type], rear combination light (RH) connector D-09 (terminal No. 3) and ETACS-ECU connector C-304 (terminal No. 16), ETACS-ECU connector C-311 (terminal No. 19) or ETACS-ECU connector C-317 (terminal No. 11) in good condition?

YES Go to Step 4.
NO Repair the wiring harness.
STEP 4. Using scan tool MB991958, Check whether the diagnostic trouble code is reset.





(1)
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.

Connect scan tool MB991958. Refer to "How to connect scan tool Reading and Clearing Diagnostic Trouble Codes."
(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.