Inspection Procedure 6: Interior Lamp Automatic Shutoff Function does not Work Normally. <Vehicles with Keyless Entry System>


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

COMMENTS ON TROUBLE SYMPTOM


The ETACS-ECU operates the interior lamp automatic-shutdown 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. Note that this function can be disabled/enabled by the adjustment function (default setting; enabled).

PROBABLE CAUSES



DIAGNOSIS PROCEDURE


STEP 1. Check the power supply circuit.


When the ignition switch is turned to the LOCK (OFF) position, check if the hazard warning lamps illuminate.

Q. Is the check result normal?

Go to Step 2.

Refer to ETACS - inspection procedure A-1 "Check the battery power supply circuit to the ETACS-ECU ."

STEP 2. Pulse check


Check the input signals below, which are related to the interior lamps.
System switch
 Check condition
Ignition switch (ACC)
 When turned from the LOCK (OFF) position to the ACC position
Ignition switch (IG1)
 When turned from ACC to ON
Driver’s door switch
 Driver’s door is opened while all the other doors are closed.
Passenger’s door switch
 Passenger’s door is opened while all the other doors are closed.
Rear door (RH) switch
 Rear door (RH) is opened while all the other doors are closed
Rear door (LH) switch
 Rear door (LH) door is opened while all the other doors are closed
Back door switch
 Back door is opened while all the other doors are closed
Interior lamp loaded signal
 When a load is applied through multi-purpose fuse No.18
OK: The M.U.T.-III sounds or the voltmeter needle fluctuates.

Q. Is the check result normal?

YES (All the signals are received normally) : Go to Step 3.

NO (The ignition switch (ACC) signal is not received) : Refer to ETACS - Input Signal Chart .

NO (The ignition switch (IG1) signal is not received) : Refer to ETACS - Input Signal Chart .

NO (All the door switch signals are not received) : Refer to ETACS - Input Signal Chart .

NO (Interior lamp loaded signal is not detected) : Refer to ETACS - Input Signal Chart .

STEP 3. Check the SWS monitor customized function.


Check that the interior lamp automatic-shutdown function has been enabled by using the SWS monitor customize function.
caution The SWS monitor must be used in order to confirm and change that setting. Use the SWS monitor to confirm and/or change the customized function.

Q. Is the check result normal?

Go to Step 4.

Enable the headlamp automatic-shutdown function by using the customized function (Refer to Customize Function ).

STEP 4. Retest the system.


Check that the interior lamp automatic-shutdown function works normally.

Q. Is the check result normal?

The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).

Replace the ETACS-ECU.