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DTC B16A3: Turn-signal light (LH) short circuit
 
 
cautionWhenever the ECU is replaced, ensure that the power supply circuit, the ground circuit and the communication circuit are normal.
 
 
 
 
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 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
STEP 1. Check front turn-signal light (LH) connector A-82 <front>, side turn-signal light (LH) connector A-13 <side (fender panel type)>, door mirror assembly (LH) connector F-01 <side (door mirror type)>, rear combination light (LH) connector D-19 <rear> for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Are front turn-signal light (LH) connector A-82 <front>, side turn-signal light (LH) connector A-13 <side (fender panel type)>, door mirror assembly (LH) connector F-01 <side (door mirror type)>, rear combination light (LH) connector D-19 <rear> in good condition?
Go to Step 2.
Repair or replace the damaged component(s). Refer to GROUP 00E, Harness Connector Inspection .
 
STEP 2. Check ETACS-ECU connectors C-403 <front or side (fender panel type)>, C-417 <side (door mirror type)> and C-413 <rear> for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Are ETACS-ECU connectors C-403 <front or side (fender panel type)>, C-417 <side (door mirror type)> and C-413 <rear> in good condition?
Go to Step 3.
Replace the bulb(s) of the light that does not illuminate.
 
STEP 3. Check the wiring harness between front turn-signal light (LH) connector A-82 (terminal 2) <front>, side turn-signal light (LH) connector A-13 (terminal 2) <side (fender panel type)>, door mirror assembly (LH) connector F-01 (terminal 2) <side (door mirror type)>, rear combination light (LH) connector D-19 (terminal 2) <rear> and ETACS-ECU connector C-403 (terminal 9) <front or side (fender panel type)>, C-417 (terminal 4) <side (door mirror type)> or C-413 (terminal 18) <rear>.
noteAlso check intermediate connector A-52 <front> or C-225 <side (door mirror type)> for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector A-52 <front> or C-225 <side (door mirror type)> is damaged, repair or replace the connector as described in GROUP 00E, Harness Connector Inspection .
  • Check the power supply line for short circuit.
Are the wiring harness between front turn-signal light (LH) connector A-82 (terminal 2) <front>, side turn-signal light (LH) connector A-13 (terminal 2) <side (fender panel type)>, door mirror assembly (LH) connector F-01 (terminal 2) <side (door mirror type)>, rear combination light (LH) connector D-19 (terminal 2) <rear> and ETACS-ECU connector C-403 (terminal 9) <front or side (fender panel type)>, C-417 (terminal 4) <side (door mirror type)> or C-413 (terminal 18) <rear> in good condition?
Go to Step 4.
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. Verify that the headlights illuminate normally.
 
STEP 4. Using scan tool MB991958, Check whether the diagnostic trouble code is set again.
(1)
cautionTo 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 ."
(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.
Is the DTC set?
Replace the ETACS-ECU.
The procedure is complete.