Code No.B16A3 Turn-signal Lamp (LH) Short Circuit
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Before replacing the ECU, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.
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DIAGNOSTIC FUNCTION
When the left wiring harness of turn-signal lamp is short circuited, the ETACS-ECU sets diagnosis code No. B16A3.
JUDGMENT CRITERIA
With the diagnosis code not set, when the short circuit is detected three times consecutively, the ETACS-ECU sets the diagnosis code No. B16A3.
PROBABLE CAUSES
- Damaged harness wires and connectors
- Malfunction of the ETACS-ECU
DIAGNOSIS PROCEDURE
STEP 1. Connector check: A-35 headlamp assembly (LH) connector, A-09 side turn-signal lamp (LH) connector and F-23 rear combination lamp (LH) connector
Q.
Is the check result normal?
Go to Step 2.
NO : Repair the defective connector.
STEP 2. Connector check: C-304 and C-311 ETACS-ECU connectors
Q.
Is the check result normal?
Go to Step 3.
Repair the defective connector.
STEP 3. Wiring harnesses check between A-35 headlamp assembly (LH) connector terminal No. 3, A-09 side turn-signal lamp (LH) connector terminal No. 2 or F-23 rear combination lamp (LH) connector terminal No. 2 and C-304 ETACS-ECU connector terminal No. 9 or C-311 ETACS-ECU connector terminal No. 18
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Before the wiring harness check, check the intermittent connector D-16, and then repair that if necessary.
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- Check the output lines for short circuit.
Q.
Is the check result normal?
Go to Step 4.
Repair the wiring harness.
STEP 4. Check whether the diagnosis code is reset.
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
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(3)Check if diagnosis code is set.
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Q.
Is the diagnosis code set?
Replace the ETACS-ECU.
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction 
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