B16A5

DTC B16A5: Turn-signal light (RH) short circuit

CAUTION:
Whenever the ECU is replaced, ensure that the power supply circuit, the ground circuit and the communication circuit are normal.


















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

STEP 1. Check headlight assembly (RH) connector A-61 [front], side turn-signal light (RH) connector A-01 [side], rear combination light
(RH) connector D-13 [rear] for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q. Are headlight assembly (RH) connector A-61 [front], side turn-signal light (RH) connector A-01 [side], rear combination light (RH) connector D-13 [rear] in good condition?

YES Go to Step 2.
NO : Repair or replace the damaged component(s). Harness Connector Inspection.
STEP 2. Check ETACS-ECU connectors C-403 and C-413 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q. Are ETACS-ECU connectors C-403 and C-413 in good condition?

YES Go to Step 3.
NO Repair or replace the damaged component(s). Harness Connector Inspection.
STEP 3. Check the wiring harness between headlight assembly (RH) connector A-61 (terminal 8) [front], side turn-signal light (RH) connector A-01 (terminal 2) [side], rear combination light (RH) connector D-13 (terminal 3) [rear] and ETACS-ECU connector C-403 (terminal 16) [front or side] or C-413 (terminal 19) [rear].

- Check the power supply line for short circuit.

Q. Are the wiring harness between headlight assembly (RH) connector A-61 (terminal 8) [front], side turn-signal light (RH) connector A-01 (terminal 2) [side], rear combination light (RH) connector D-13 (terminal 3) [rear] and ETACS-ECU connector C-403 (terminal 16) [front or side] or C-413 (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.

(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.