INSPECTION PROCEDURE J-1: The ignition key cylinder illumination lamp does not illuminate/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 this function in accordance with the input signals below.
<Vehicles without keyless entry system>
  • Ignition switch (IG1)
  • Driver’s door switch
<Vehicles with keyless entry system>
  • Ignition switch (IG1)
  • Key reminder switch
  • Driver’s door switch
  • Interior lamp loaded signal
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.

POSSIBLE CAUSES

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

DIAGNOSTIC PROCEDURE

Step 1. Check the operation of the interior lamp.
Check that the interior lamp illuminate and extinguish normally.

Q. Is the check result normal?
Go to Step 2.
Refer to inspection procedure O-1 "The interior lamps (room ramp, rear personal lamps, door lamps, luggage compartment lamp, key illumination lamp) does not illuminate or extinguish normally ."

Step 2. Pulse check
Check the input signals below, which are related to the ignition key cylinder illumination lamp.
System switch
 Check condition
Ignition switch (IG1)
 When turned from ACC to ON
Key reminder switch*
 When the inserted ignition key is pulled out
Driver’s door switch
 When the driver’s door is opened
note *: Vehicles with keyless entry system
OK: The M.U.T.-III sounds or the voltmeter needle fluctuates.

Q. Are the check result normal?
All the signals are received normally. : Go to Step 3.
The ignition switch (IG1) signal is not received. : Refer to inspection procedure P-2 "The ignition switch (IG1) signal is not received ."
The key reminder switch signal is not received. : Refer to inspection procedure P-10 "The key reminder switch signal is not received ."
The driver’s door switch signal is not received. : Refer to inspection procedure P-5 "The driver’s door switch signal is not received <LH drive vehicles> or <RH drive vehicles> ."

Step 3. Connector check: C-308 key reminder switch connector


Q. Is the check result normal?

Go to Step 4.

Repair the defective connector.

Step 4. 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 5.
Replace the bulb of the ignition key cylinder illumination lamp.

Step 5. Connector check: C-221 ETACS-ECU connector


Q. Is the check result normal?

Go to Step 6.

Repair the defective connector.

Step 6. Check the wiring harness from C-221 ETACS-ECU connector terminal Nos.69 and 71 to C-308 ignition key cylinder illumination lamp connector terminal Nos.1 and 2.





  • Check the input and output lines for open circuit.

Q. Is the check result normal?

Go to Step 7.

Repair the 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 Cope with Intermittent Malfunction ).
Replace the ETACS-ECU.