Inspection Procedure 1: The Ignition Key Cylinder Illumination Lamp does not Illuminate 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 this function in accordance with the input signals below.

Ignition switch (IG1)
Key reminder switch
Door switch (front: RH)

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

PROBABLE CAUSES

Malfunction of the key reminder switch
Malfunction of the door switch (front: RH)
Malfunction of the ignition key cylinder illumination lamp bulb
Malfunction of the ETACS-ECU
Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. Check the operation of the front room lamp and rear room lamp.

Check that the front room lamp and rear room lamp illuminate and extinguish normally.

Q. Is the check result normal?

	YES <Vehicles without key reminder switch> : Go to Step 2.

	YES <Vehicles with key reminder switch> : Go to Step 3.

	Refer to inspection procedure 1 "The interior lamps (front room ramp, rear room lamp and ignition key cylinder illumination lamp) does not illuminate or extinguish normally ."

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

Check the input signals below, which are related to the ignition key cylinder illumination lamp.

Turn the ignition switch to the "LOCK" (OFF) position. (key inserted)

Item No.	Item name	Normal condition
28	Steering lock switch	OFF

OK: Normal condition is displayed.

Q. Is the check result normal?

	Go to Step 4.

	Go to Step 3.

STEP 3. Check the key reminder switch

Check that the key reminder switch works normally. Refer to

Q. Is the check result normal?

	Go to Step 4.

	Replace the door switch.

STEP 4. Connector check: C-301 key reminder switch connector

Q. Is the check result normal?

Go to Step 5.

Repair the defective connector.

STEP 5. Check the bulb of the ignition key cylinder illumination lamp.

Check the bulb of the ignition key cylinder illumination lamp.

Q. Is the check result normal?

	Go to Step 6.

	Replace the bulb of the ignition key cylinder illumination lamp.

STEP 6. Voltage measurement at C-301 key reminder switch connector

(1)Disconnect the connector, and measure at the wiring harness side.

(2)Voltage between C-301 power window main switch connector terminal No.2 and body earth.
OK: System voltage

Q. Is the check result normal?

Go to Step 8.

Go to Step 7.

STEP 7. Check the wiring harness from C-301 key reminder switch connector terminal No.2 to battery

Check the power supply line for open circuit.

note

Prior to the wiring harness inspection, check joint connectors C-132, and junction block connector C-209 and C-213, and repair if necessary.

Q. Is the check result normal?

Go to Step 10.

Repair the wiring harness.

STEP 8. Connector check: C-219 ETACS-ECU connector

Q. Is the check result normal?

Go to Step 9.

Repair the defective connector.

STEP 9. Check the wiring harness from C-219 ETACS-ECU connector terminal No.62 to C-301 key reminder switch connector terminal No.1.

Check the input line for open circuit.

Q. Is the check result normal?

Go to Step 10.

Repair the wiring harness.

STEP 10. Retest the system.

Check that the ignition key cylinder illumination lamp illuminates or extinguishes 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.