Inspection Procedure 6: The Headlamp Automatic-shutdown Function does not Work Normally.


caution Whenever the ECU is replaced, ensure that the input and output signal circuits are normal.


COMMENTS ON TROUBLE SYMPTOM


The ETACS-ECU operates this function in accordance with the input signals below.

If this function does not work normally, these input signal circuit(s) or the ETACS-ECU may be defective.

PROBABLE CAUSES



DIAGNOSIS PROCEDURE


STEP 1. Check of adjustment details for the headlamp automatic-shutdown


Check that the headlamp automatic-shutdown function is set to "Operation" using the customisation function of M.U.T-III.

Q. Is the check result normal?

Go to Step 2.

Using the customisation function of M.U.T-III, set the headlamp automatic-shutdown function to "Operation."

STEP 2. M.U.T.-III diagnosis code.


When the ignition switch is turned to the "LOCK" (OFF) position, check that the ETACS-ECU does not set the diagnosis code.

Q. Is the diagnosis code set?

Refer to diagnosis code chart .

Go to Step 3.

STEP 3. M.U.T.-III data list


Check the input signals below, which are related to the headlamp automatic-shutdown function.

Item No.
 Item name
 Normal condition
19
 Drive’s door switch
 ON
30
 Ignition switch(IG1)
 OFF
60
 Headlamp output
 ON
OK: Normal conditions are displayed for all the items

Q. Are the check result normal?

YES <All the signals are received normally.> : Go to Step 4.

NO <The driver’s door switch signal is not received.> : Refer to inspection procedure C-5 "One of the door switch signals is not received ."

NO <The ignition switch (IG1) signal is not received.> : Refer to inspection procedure C-3 "The ignition switch (IG1) signal is not received ."

NO <The headlamp switch signal is not received.> : Refer to inspection procedure C-1 "The column switch (lighting and wiper switch) signal is not received ."

STEP 4. Retest the system.


Check that the headlamp automatic-shutdown function works normally.

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 ).

Replace the ETACS-ECU.