INSPECTION PROCEDURE O-3: 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

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

DIAGNOSIS PROCEDURE

Step 1. Check the adjustment function.

Check that the interior lamp automatic shutdown function has been enabled by using the adjustment function.

Q: Is the check result normal?

YES: Go to Step 2

.
NO: Enable the interior lamp automatic shutdown function by using the adjustment function. Refer to

Step 2. 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 3

.
NO: Refer to Inspection Procedure A-2 "Check the ETACS-ECU battery power supply circuit

Step 3. Pulse check

Check the input signals below, which are related to the front and rear room 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.
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: Is the check result normal?

All the signals are received normally.: Go to Step 4

.
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 <LH drive vehicles>

." Refer to Inspection Procedure P-4 "The driver's door switch signal is not received <RH drive vehicles>

."
All the door switch signals are not received.: Refer to Inspection Procedure P-12 "All the door switch signals are not received <LH drive vehicles>

." Refer to Inspection Procedure P-12 "All the door switch signals are not received <RH drive vehicles>

."
Interior lamp loaded signal is not detected: Refer to Inspection Procedure P-18 "The interior lamp loaded signal is not detected

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.