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
If a trouble occurs in headlamp assembly (headlamp levelling unit), code No. B2513 is stored.
JUDGEMENT CRITERIA
The ETACS-ECU detects the short-circuit of the signal line to the headlamp assembly (headlamp levelling unit) for 1 second or longer continuously.
PROBABLE CAUSES
Malfunction of headlamp assembly (headlamp levelling unit)
Malfunction of the ETACS-ECU
Damaged harness wires and connectors
DIAGNOSIS PROCEDURE
STEP 1. Check of short to power supply, short to earth circuit in MSL line between headlamp assembly (LH) connector and ETACS-ECU connector.
Q.
Is the check result normal?
Go to Step 2
Repair the connector(s) or wiring harness.
STEP 2. Check whether the diagnosis code is reset.
Q.
Is diagnosis code No. B2513 set?
Go to Step 3
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to cope with Intermittent Malfunction ).
STEP 3. Check of short to power supply, short to earth circuit in MSR line between headlamp assembly (RH) connector and ETACS-ECU connector.
Q.
Is the check result normal?
Go to Step 4
Repair the connector(s) or wiring harness.
STEP 4. Check whether the diagnosis code is reset.
Q.
Is diagnosis code No. B2513 set?
Go to Step 5
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to cope with Intermittent Malfunction ).
STEP 5. M.U.T.-III data list
(1)Disconnect the headlamp assembly (LH) and headlamp assembly (RH) connector.
(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
Item No.
Item name
Normal condition
Item 418
A/L actuator output voltage
Indicates the voltage value of system voltage within the range of 20 to 80%.
OK: Normal condition is displayed.
Q.
Is the check result normal?
Go to Step 6
Go to Step 8
STEP 6. Check the headlamp assembly (LH).
Check the headlamp assembly (LH) for internal failure.
(1)Disconnect the headlamp assembly (RH) connector.
(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
(3)Perform the drive test using the M.U.T.-III. Refer to .
Q.
Is the check result normal?
Go to Step 7
Replace the headlamp assembly (LH).
STEP 7. Check the headlamp assembly (RH).
Check the headlamp assembly (RH) for internal failure.
(1)Disconnect the headlamp assembly (LH) connector.
(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
(3)Perform the drive test using the M.U.T.-III. Refer to .
Q.
Is the check result normal?
Go to Step 8
Replace the headlamp assembly (RH).
STEP 8. Check whether the diagnosis code is reset.
Go to Step 2
Repair the connector(s) or wiring harness.
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