Inspection Procedure 1: The ignition key cylinder illumination lamp does not illuminate/extinguish normally.


caution
  • Before replacing the ECU, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.
  • When the ETACS-ECU of vehicles without KOS is replaced, the encrypted code of the ignition key needs to be registered to the ETACS-ECU. (If the encrypted code is not registered, the engine cannot be started. Register the encrypted code as described in Immobilizer System - How to Register Key ID .)

OPERATION


The ETACS-ECU operates this function in accordance with the input signals below.

COMMENTS ON TROUBLE SYMPTOM


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



DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III diagnosis code
Check if diagnosis code is set to the ETACS-ECU.

Q. Is the diagnosis code set?
Troubleshoot the ETACS-ECU. Refer to .
Go to Step 2.

STEP 2. M.U.T.-III data list
Check the signal related to the operation of ignition key cylinder illumination lamp.

  • Turn the ignition switch to the LOCK "(OFF)" position.
  • Remove the ignition key from the ignition key cylinder.
  • Open the driver’s door.
Item No.
 Item name
 Normal condition
Item 228
 Dr door unlock
 ON
Item 254
 IG voltage
 1 V or less
Item 256
 Dr door ajar switch
 Open
Item 264
 Handle lock switch
 Key in → Key out
Item 270
 Dr door lock switch
 Not lock
Item 271
 Dr door unlock switch
 Unlock
OK: Normal conditions are displayed for all the items.

Q. Is the check result normal?
Normal conditions are displayed for all the items. : Go to Step 3.
Normal condition is not displayed for item No. 228. : Troubleshoot the ETACS-ECU. Refer to Inspection Procedure 4 "The front door lock actuator (driver’s side) signal is not received." .
Normal condition is not displayed for item No. 254. : Troubleshoot the ETACS-ECU. Refer to Inspection Procedure 2 "The ignition switch (IG1) signal is not received." .
Normal condition is not displayed for item No. 256. : Troubleshoot the ETACS-ECU. Refer to Inspection Procedure 5 "The front door switch (driver’s side) signal is not received." .
Normal condition is not displayed for item No. 264. : Troubleshoot the ETACS-ECU. Refer to Inspection Procedure 3 "The key reminder switch signal is not received." .
Normal condition is not displayed for item No. 270, 271. : Troubleshoot the ETACS-ECU. Refer to Inspection Procedure 4 "The front door lock actuator (driver’s side) signal is not received." .

STEP 3. Check of open circuit in LP+3 line key reminder switch connector and ETACS-ECU connector.

Q. Is the check result normal?
Go to Step 4.
Repair the connector(s) or wiring harness.

STEP 4. Check of ignition key cylinder illumination lamp bulb
Check that the ignition key cylinder illumination lamp bulb is normal.

Q. Is the check result normal?
Go to Step 5.
Replace the bulb of the ignition key cylinder illumination lamp.

STEP 5. Check of open circuit in earth line between key reminder switch connector and body earth.

Q. Is the check result normal?
Go to Step 6.
Repair the connector(s) or wiring harness.

STEP 6. Check of open circuit in (RLP-1, RLP-2&RLP-3) line between key reminder switch connector and body earth.

Q. Is the check result normal?
Go to Step 7.
Repair the connector(s) or wiring harness.

STEP 7. Retest the system
Check that the ignition key cylinder illumination lamp illuminates/extinguishes normally.

Q. Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
Replace the ETACS-ECU.