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 .)
DIAGNOSTIC FUNCTION
When the right bulb of turn-signal lamp is blown, the ETACS-ECU sets diagnosis code No.
B16A4.
JUDGEMENT CRITERIA
The ETACS-ECU sets diagnosis code No. B16A4 under the following conditions.
With the diagnosis code not set, 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 set.
PROBABLE CAUSES
Malfunction of turn-signal lamp bulb (right side)
Malfunction of turn-signal lamp 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 and rear combination lamp (TURN: RH) connector
(1)Disconnect the connector, and measure at the wiring harness side.
(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.
Measure the resistance between the rear combination lamp (TURN: RH) connector (earth
terminal) and the body earth.
OK: Continuity exists (2 Ω or less)
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 or 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 attachment 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 side turn-signal lamp (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 reset.
(1)Erase the diagnosis code.
(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
(3)Check if diagnosis code is set.
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 ).
Go to Step 2.
Replace the bulb of turn-signal lamp which does not illuminate.
).