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). In order to change the setting, the SWS monitor is required.

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 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?

YES: Go to Step 2

.
NO: Refer to inspection procedure A-2 "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 lamp automatic shutdown function.

System switch	Check conditions
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.
All of the door switches	A door is opened when all the doors are closed
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: Are 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-13 "All the door switch signals are not received"

.
Interior lamp loaded signal is not detected: Refer to inspection procedure P-17 "Interior lamp loaded signal is not detected"

Step 3. 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".

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?

YES: Go to Step 4

.
NO: Use the SWS monitor customize function to se the "H/L AUTO-CUT " to other than "W/O FUNCTION" (Refer to GROUP 54C - Adjustment function

Step 4. 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.