Ignition key cylinder illumination lamp does not illuminate/extinguish normally. <vehicles with WCM>



caution Whenever the ECU is replaced, ensure that the input and output signal circuits are normal.












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
Dr door ajar switch
0 V
Item 256
Dr door ajar switch
ON
Item 264
Handle lock switch
Key in → Key out
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 (RH) 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 (RH) signal is not received" .
Normal condition is not displayed for item No. 264. : Troubleshoot the ETACS-ECU. Refer to Inspection Procedure 3 "Key reminder switch signal is not received" .

STEP 3. Connector check: C-209 key reminder switch connector, C-315 ETACS-ECU connector


Q. Is the check result normal?

Go to Step 4.
Repair the defective connector.

STEP 4. Wiring harness check between the C-209 key reminder switch connector terminal No. 3, 5 and the C-315 ETACS-ECU connector terminal No. 13, 18



  • Check the input/output line for open circuit.

Q. Is the check result normal?

Go to Step 5.
Repair the wiring harness.

STEP 5. 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 6.
Replace the bulb of the ignition key cylinder illumination lamp.

STEP 6. 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.