Ignition key cylinder illumination lamp does not illuminate/extinguish normally. <vehicles with KOS (with dead lock system)>


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










OPERATION




  • Ignition switch (IG1)
  • Key reminder switch
  • Steering lock (CAN information)
  • Driver’s door switch

COMMENTS ON TROUBLE SYMPTOM



PROBABLE CAUSES



  • Malfunction of CAN bus line
  • Malfunction of the key reminder switch
  • Malfunction of the driver’s door switch
  • Malfunction of the ignition key cylinder illumination lamp bulb
  • Malfunction of the ETACS-ECU
  • Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.

Q. Is the check result normal?
Go to Step 2.
Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting ).

STEP 2. M.U.T.-III other system diagnosis code
Check if diagnosis code is set to the KOS-ECU.

Q. Is the diagnosis code set?
Troubleshoot the KOS (Refer to GROUP 42B - KOS ).
Go to Step 3.

STEP 3. 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
 0 V
Item 256
 Dr door ajar switch
 ON
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 4.
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" .
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 4. Connector check: C-211 key reminder switch connector, C-315 ETACS-ECU connector

Q. Is the check result normal?
Go to Step 5.
Repair the defective connector.

STEP 5. Wiring harness check between the C-211 key reminder switch connector terminal No. 5 and the C-315 ETACS-ECU connector terminal No. 18

  • Check the input/output line for open circuit.

Q. Is the check result normal?
Go to Step 6.
Repair the wiring harness.

STEP 6. 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 7.
Replace the bulb of the ignition key cylinder illumination lamp.

STEP 7. Wiring harness check between the C-211 key reminder switch connector terminal No. 7 and the body earth

Q. Is the check result normal?
Go to Step 8.
Repair the wiring harness.

STEP 8. 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.