Code No.B16A4 Turn-signal (RH) bulb outage
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- 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 right bulb of turn-signal lamp is blown, the ETACS-ECU stores diagnosis code No. B16A4.
JUDGEMENT CRITERIA
The ETACS-ECU stores diagnosis code No. B16A4 under the following conditions.
- With the diagnosis code not stored, if there is a malfunction to the right turn-signal lamp bulb, the blown right bulb counter counts once when the illumination of hazard or turn-signal lamp (right side) is attempted.
- If the blown right bulb counter reaches "3," the diagnosis code No. B16A4 is stored.
PROBABLE CAUSES
- Malfunction of front or rear turn-signal lamp bulb (right side)
- Malfunction of side turn-signal lamp assembly (right side) <Fender panel type>
- Malfunction of door mirror assembly (right side) <Integrated in door mirror type>
- Damaged harness wires and connectors
- Malfunction of the ETACS-ECU
DIAGNOSIS PROCEDURE
STEP 1. Bulb check
Check whether the bulb of turn-signal lamp which does not illuminate is normal.
Q.
Is the check result normal?
Go to Step 2.
Replace the bulb of turn-signal lamp which does not illuminate.
STEP 2. Resistance measurement at the headlamp assembly (TURN: RH) connector, side turn-signal lamp (RH) connector <Fender panel type> or door mirror assembly (RH) connector <Integrated in door mirror type> and rear combination lamp (TURN: RH) connector
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(1)Disconnect the connector, and measure at the wiring harness side.
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(2)Measure the resistance between the connector terminal of lamp which does not illuminate and the body earth.
- Measure the resistance between the headlamp assembly (TURN: RH) connector (earth terminal) and the body earth.
- Measure the resistance between the side turn-signal lamp (RH) connector (earth terminal) and the body earth. <Fender panel type>
- Measure the resistance between the door mirror assembly (RH) connector (earth terminal) and the body earth. <Integrated in door mirror type>
- Measure the resistance between the rear combination lamp (TURN: RH) connector (earth terminal) and the body earth.
OK: Continuity exists (2 Ω or less)
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Q.
Is the check result normal?
Go to Step 4.
Go to Step 3.
STEP 3. Check of open circuit in earth line between headlamp assembly (TURN: RH) connector, side turn-signal lamp (RH) connector <Fender panel type> or door mirror assembly (RH) connector <Integrated in door mirror type> and rear combination lamp (TURN: RH) connector and the body earth
Q.
Is the check result normal?
Go to Step 8.
Repair the connector(s) or wiring harness.
STEP 4. Check of open circuit in TR1&TR2-1 line between ETACS-ECU connector and headlamp assembly (TURN: RH) connector
Q.
Is the check result normal?
Go to Step 5.
Repair the connector(s) or wiring harness.
STEP 5. Check of open circuit in TR1&TR2-1 line between ETACS-ECU connector and side turn-signal lamp (RH) connector <Fender panel type>
Q.
Is the check result normal?
Go to Step 6.
Repair the connector(s) or wiring harness.
STEP 6. Check of open circuit in TR3 line between ETACS-ECU connector and rear combination lamp (TURN: RH) connector
Q.
Is the check result normal?
Go to Step 7.
Repair the connector(s) or wiring harness.
STEP 7. Check of open circuit in TR2-2 line between ETACS-ECU connector and door mirror assembly (RH) connector <Integrated in door mirror type>
Q.
Is the check result normal?
Go to Step 8.
Repair the connector(s) or wiring harness.
STEP 8. 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 ).