Inspection Procedure 1: The Interior Lamps (front room lamp, rear room lamp and ignition key cylinder illumination lamp) does not Illuminate or Extinguish 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 lamps (room lamp, rear room lamp) in accordance with the input signals below.

Ignition switch (IG1)
Driver’s door lock actuator
Driver’s door switch
Passenger’s door switch
Rear door switch

If this function does not work normally, these input signal circuit(s) or the ETACS-ECU may be defective.

PROBABLE CAUSES

Malfunction of the door lock actuator (RH)
Malfunction of the door switches
Malfunction of the ETACS-ECU
Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III diagnosis code

When the ignition switch is turned to the "LOCK" (OFF) position, check that the ETACS-ECU does not set the diagnosis code.

Q. Is the diagnosis code set?

Refer to diagnosis code chart

Go to Step 2.

STEP 2. M.U.T.-III data list

Check the input signals below, which are related to the interior lamps (front room lamp, rear room lamp and ignition key cylinder illumination lamp).

Turn the ignition switch to the "OFF" position. (key inserted)
Open the all of doors.
When the driver’s door is unlocked

Item No.	Item name	Normal condition
19	Driver’s Door switch	ON
20	Driver’s door unlock switch	ON
21	Driver’s door lock switch	OFF
30	Ignition switch (IG1)	OFF
48	Passenger’s Door switch	ON
49	Rear door switch	ON

OK: Normal conditions are displayed for all the items.

Q. Is the check result normal?

YES <All the signals are received normally.>

: Go to Step 4.

NO <The door lock actuator (RH) signal is not received.>

: Go to Step 3.

NO <The ignition switch (IG1) signal is not received.> : Refer to inspection procedure C-3 "The ignition switch (IG1) signal is not received

."

NO <The door switches signals are not received.> : Refer to inspection procedure C-5 "One of the door switch signals is not received

STEP 3. Check the door lock actuator (RH).

Check that the front door lock actuator (RH) works normally. Refer to GROUP 42 - Door

Q. Is the check result normal?

Go to Step 4.

Replace the door lock actuator (RH).

STEP 4. Retest the system.

Check that the interior lamps (front room lamp, rear room lamp and ignition key cylinder illumination lamp) illuminate 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.