B16A3

DTC B16A3: Turn-signal Light (LH) Short Circuit

Turn-Signal Lights Circuit (LH):

TROUBLE JUDGMENT
When the left wiring harness of turn-signal light is short circuited, the ETACS-ECU sets DTC B16A3.

TECHNICAL DESCRIPTION (COMMENT)
When the short circuit is detected three times consecutively, the ETACS-ECU sets the DTC B16A3.

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 (LH) connector A-37 [front], side turn-signal light (LH) connector A-10 [side], rear combination light (LH) connector D-14 [rear] for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Are headlight assembly (LH) connector A-37 [front], side turn-signal light (LH) connector A-10 [side], rear combination light (LH) connector D-14 [rear] in good condition?

YES : Go to Step 2.

NO : Repair the damaged parts.

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 the damaged parts.

STEP 3. Check the wiring harness between headlight assembly (LH) connector A-37 (terminal No. 5) [front], side turn-signal light (LH) connector A-10 (terminal No. 2) [side], rear combination light (LH) connector D-14 (terminal No. 3) [rear] and ETACS-ECU connector C-304 (terminal No. 9) [front or side] or ETACS-ECU connector C-311 (terminal No. 18) [rear].

Q: Are the wiring harness between headlight assembly (LH) connector A-37 (terminal No. 5) [front], side turn-signal light (LH) connector A-10 (terminal No. 2) [side], rear combination light (LH) connector D-14 (terminal No. 3) [rear] and ETACS-ECU connector C-304 (terminal No. 9) [front or side] or ETACS-ECU connector C-311 (terminal No. 18) [rear] 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.

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." Scan Tool Connecting
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.