Inspection Procedure 4: The Headlamps do not Illuminate When the Passing Switch is Turned ON.
caution
Whenever the ECU is replaced, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.
COMMENTS ON TROUBLE SYMPTOM
If both headlamps (low-beam and high-beam) do not illuminate, the passing switch input circuit or ETACS-ECU may have a problem.
PROBABLE CAUSES
Malfunction of column switch
Malfunction of the ETACS-ECU
Damaged harness wires and connectors
DIAGNOSIS PROCEDURE
STEP 1. Check the operation of the headlamps.
Check that the low-beam and high-beam headlamps illuminate normally.
Q.
Is the check result normal?
Go to Step 2.
Refer to Inspection Procedure 1 "The low-beam headlamps do not illuminate normally." and Inspection Procedure 2 "The high-beam headlamps do not illuminate normally." .
STEP 2. M.U.T.-III diagnosis code
Check if diagnosis code is set to the ETACS-ECU.
Q.
Is the diagnosis code set?
Troubleshoot the ETACS-ECU. Refer to .
Go to Step 3.
STEP 3. Retest the system
Check that the headlamps (low-beam and high-beam) illuminates normally when turning ON the passing switch.
Q.
Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 -
How to use Troubleshooting/inspection Service Points -
How to Cope with Intermittent Malfunction ).