INSPECTION PROCEDURE N-2: 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 customize function (default setting; 30 minutes).

POSSIBLE CAUSES

Malfunction of the door switches

Malfunction of the room lamp

Malfunction of the ETACS-ECU

Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. Check the SWS monitor customized function.

Use the SWS monitor customize function to confirm that "RM/L AUTO-CUT" is set to other than "W/O FUNCTION".

Q: Is the check result normal?

YES: Go to Step 2

.
NO: Use the SWS monitor customize function to se the "RM/L AUTO-CUT" to other than "W/O FUNCTION" (Refer to

Step 2. ECU check on the SWS monitor

Check that the power supply and earth lines to the ETACS-ECU and the SWS communication lines are normal.

Ignition switch: OFF

ECUS TO BE CHECKED

ETACS ECU

OK: "OK" is displayed on the "ETACS ECU" menu.

Q: Is the check result normal?

YES: Go to Step 3

.
NO: Refer to Inspection Procedure A-3 "Communication with the ETACS-ECU is not possible"

Step 3. Confirm communication data by using the SWS monitor.

Check the input signals below, which are related to the interior lamp automatic shutdown function.

<Selected item> ETACS

Ignition switch: OFF

Driver's door: Open (close only when item No.38 is to be checked)

All the doors: Open any door when all the doors are closed (close only when item No.32 is to be checked)

Item No.	Item name	Normal conditions
Item 30	IG SW(IG1)	OFF
Item 31	IG SW(ACC)	OFF
Item 32	DR DOOR SW	ON
Item 38	THEFT-ALARM	OFF→ON

OK: Normal condition is displayed.

Q: Are the check result normal?

Normal conditions are displayed for all the items.: Go to Step 4

.
Normal condition is not displayed for item No.30.: Refer to inspection procedure P-2 "The ignition switch (IG1) signal is not received"

.
Normal condition is not displayed for item No.31.: Refer to inspection procedure P-1 "The ignition switch (ACC) signal is not received"

.
Normal condition is not displayed for item No.32.: Refer to inspection procedure P-4 "The driver's door switch signal is not received"

.
Normal condition is not displayed for item No.38.: Refer to inspection procedure P-13 "All the door switch signals are not received"

Step 4. Pulse check

Check the input signals below, which are related to the interior lamp automatic shutdown function.

System switch	Check conditions
INTERIOR LAMP LOADED SIGNAL	When a load is applied through multi-purpose fuse No.18

OK: The MUT-II/III sounds or the voltmeter needle fluctuates.

Q: Is the check result normal?

YES: Go to Step 5

.
NO: Refer to inspection procedure P-17 "Interior lamp loaded signal is not detected"

Step 5. Retest the system.

Check that the interior lamp automatic shutdown function works normally.

Q: Is the check result normal?

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

).
NO: Replace the ETACS-ECU.