Inspection Procedure 3: The key reminder switch signal is not received. <Vehicles without KOS>



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 .)

COMMENTS ON TROUBLE SYMPTOM


The key reminder switch input signal is used for the operation judgement of the functions below. If the signal is abnormal, these functions will not work.


PROBABLE CAUSES




DIAGNOSIS PROCEDURE


STEP 1. Check the key reminder switch.


Refer to .

Q. Is the check result normal?

Go to Step 2.

Replace the key reminder switch.

STEP 2. Resistance measurement at key reminder switch connector (earth terminal)


(1)Disconnect the connector, and measure at the wiring harness side.
(2)Measure the resistance between the key reminder switch connector (earth terminal) and body earth.
OK: Continuity exists (2 Ω or less)

Q. Is the check result normal?

Go to Step 4.

Go to Step 3.

STEP 3. Check of open circuit in earth line between key reminder switch connector and the body earth


Q. Is the check result normal?

Intermittent malfunction is suspected (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).

Repair the connector(s) or wiring harness.

STEP 4. Check of short to power supply, short to earth, and open circuit in HL1+ line between ETACS-ECU connector and key reminder switch connector


Q. Is the check result normal?

Go to Step 5.

Repair the connector(s) or wiring harness.

STEP 5. M.U.T.-III data list


Check the input signals from the key reminder switch.

Item No.
Item name
Normal condition
Item 264
Handle lock switch
Key in
OK: Normal condition is displayed.

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.