Inspection Procedure N-6: Interior lamp automatic shutoff 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 the interior lamp automatic-shutdown function in accordance with the input signals below.

  • Ignition switch (ACC)
  • Ignition switch (IG1)
  • Driver’s door switch
  • All of the door switches
  • Interior lamp loaded signal
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).

POSSIBLE CAUSES

  • Malfunction of the door switches
  • Malfunction of the room lamp
  • Malfunction of the ETACS-ECU
  • Damaged harness wires and connectors

DIAGNOSTIC 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 Inspection Procedure A-2 "When the ignition switch is at the LOCK (OFF) position, the functions do not work normally. Check the battery power supply circuit to the ETACS-ECU ."

Step 2. Pulse check
Check the input signals below, which are related to the front and rear dome 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 opened
Rear door (RH) switch
 Rear door (RH) opened
Rear door (LH) switch
 Rear door (LH) opened
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?
All the signals are received normally. : Go to Step 3.
The ignition switch (ACC) signal is not received. : Refer to Inspection Procedure P-1 "The ignition switch (ACC) signal is not received ."
The ignition switch (IG1) signal is not received. : Refer to Inspection Procedure P-2 "The ignition switch (IG1) signal is not received ."
The driver’s door switch signal is not received. : Refer to Inspection Procedure P-4 "The driver’s door switch signal is not received ."
All the door switch signals are not received. : Refer to Inspection Procedure P-12 "All the door switch signals are not received ."
Interior lamp loaded signal is not detected : Refer to Inspection Procedure P-21 "Interior lamp loaded signal is not detected ."

Step 3. Customize function by using the SWS monitor
Check that the interior lamp automatic-shutdown function has been enabled by using the adjustment 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 interior lamp automatic-shutdown function by using the SWS monitor customize function (Refer to GROUP 54E - Customize adjustment ).

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.