Code No.B16A3 Turn-signal (LH) circuit short
caution |
- Before replacing the ECU, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.
- When the ETACS-ECU of vehicles without KOS is replaced, the encrypted code of the ignition key needs to be registered to the ETACS-ECU. (If the encrypted code is not registered, the engine cannot be started. Register the encrypted code as described in Immobilizer System - How to Register Key ID .)
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DIAGNOSTIC FUNCTION
When the left wiring harness of turn-signal lamp is short circuited, the ETACS-ECU stores diagnosis code No. B16A3.
JUDGEMENT CRITERIA
With the diagnosis code not stored, when the short circuit is detected three times consecutively, the ETACS-ECU stores the diagnosis code No. B16A3.
PROBABLE CAUSES
- Damaged harness wires and connectors
- Malfunction of the ETACS-ECU
DIAGNOSIS PROCEDURE
STEP 1. Check of short circuit in TL1&TL2-1 line between ETACS-ECU connector and headlamp assembly (TURN: LH) connector
Q.
Is the check result normal?
Go to Step 2.
Repair the connector(s) or wiring harness.
STEP 2. Check of short circuit in TL1&TL2-1 line between ETACS-ECU connector and side turn-signal lamp (LH) connector <Fender panel type>
Q.
Is the check result normal?
Go to Step 3.
Repair the connector(s) or wiring harness.
STEP 3. Check of short circuit in TL3-1&TL3-2 line between ETACS-ECU connector and rear combination lamp (TURN: LH) connector
Q.
Is the check result normal?
Go to Step 4.
Repair the connector(s) or wiring harness.
STEP 4. Check of short circuit in TL2-2 line between ETACS-ECU connector and door mirror assembly (LH) connector <Integrated in door mirror type>
Q.
Is the check result normal?
Go to Step 5.
Repair the connector(s) or wiring harness.
STEP 5. Check whether the diagnosis code is stored again.
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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 stored.
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Q.
Is the diagnosis code stored?
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 ).