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.

Ignition switch (ACC)
Ignition switch (IG1)
Driver’s door switch
Back 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).

PROBABLE CAUSES

Malfunction of the door switches
Malfunction of the back door switch
Malfunction of the interior lamp
Malfunction of the ETACS-ECU
Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. Customize function by using the SWS monitor

Use the SWS monitor customisation function to confirm that "Room lamp auto-cut" is set to other than "Without function" (one of the settings below).

3min.
30min.
60min.

Q. Is the check result normal?

Go to Step 2.

Use the SWS monitor customisation function to confirm that "Room lamp auto-cut" is set to other than "Without function" (Refer to

STEP 2. ECU check by using 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

ECU TO BE CHECKED

ETACS

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

Q. Is the check result normal?

Go to Step 3.

Refer to GROUP 54C - Trouble Symptom Chart

STEP 3. SWS monitor data list.

Check the input signals below, which are related to the interior lamp automatic-shutdown function.
<Selected item> ETACS ECU

Ignition switch: OFF
Driver’s door: open

Item No.	Item name	Normal condition
Item 30	IG SW(IG1)	OFF
Item 31	IG SW(ACC)	OFF
Item 32	FRONT DOOR SW	ON

OK: Normal condition is displayed.

Q. Is the check result normal?

YES (Normal conditions are displayed for all the items)

: Go to Step 4.

NO (Normal condition is not displayed for item No.30) : Refer to ETACS - Input Signal Chart

.

NO (Normal condition is not displayed for item No.31) : Refer to ETACS - Input Signal Chart

.

NO (Normal condition is not displayed for item No.32) : Refer to ETACS - Input Signal Chart

STEP 4. ETACS switch data by using the SWS monitor

Check the ETACS-ECU signals related to the operation of the interior lamp automatic-shutdown function.

Passenger’s door: Close → Open

Item No.	Item name	Normal condition
Item 05	Passenger’s door switch	from OFF to ON

Back door: Close → Open

Item No.	Item name	Normal condition
Item 07	Rear and back gate door switch	from OFF to ON

Rear door (RH): Close → Open

Item No.	Item name	Normal condition
Item 41	Rear door (right side) switch	from OFF to ON

Rear door (LH): Close → Open

Item No.	Item name	Normal condition
Item 42	Rear door (left side) switch	from OFF to ON

OK: Normal conditions are displayed for all the items.

Q. Is the check result normal?

Go to Step 5.

Refer to ETACS - Input Signal Chart

STEP 5. Pulse check

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

System switch	Check condition
Interior lamp loaded signal	When a load is applied through fuse No.18

OK: The M.U.T.-III sounds or the voltmeter needle fluctuates.

Q. Is the check result normal?

Go to Step 6.

Refer to ETACS - Input Signal Chart

STEP 6. 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.