INSPECTION PROCEDURE P-10: The key reminder switch signal is not received.


caution Whenever the ECU is replaced, ensure that the input signal circuit is normal.


COMMENTS ON TROUBLE SYMPTOM
Input signal from the key reminder switch is used to operate the functions below. If the signal is abnormal, these functions will not work normally.

  • Keyless entry system
  • Keyless entry hazard answerback
  • Ignition key cylinder illumination lamp
  • Interior lamps

POSSIBLE CAUSES

  • Malfunction of the key reminder switch
  • Malfunction of the ETACS-ECU
  • Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. Connector check: C-308 key reminder switch connector

Q. Is the check result normal?

Go to Step 2.

Repair the defective connector.

Step 2. Check the key reminder switch.
Refer to GROUP 54A - Ignition switch .

Q. Is the check result normal?
Go to Step 3.
Replace the key reminder switch.

Step 3. Resistance measurement at the C-308 key reminder switch connector.

(1)Disconnect the connector, and measure at the wiring harness side.

(2)Resistance between C-308 key reminder switch connector terminal No.4 and body earth
OK: 2 Ω or less

Q. Is the check result normal?

Go to Step 5.

Go to Step 4.

Step 4. Check the wiring harness between C-308 key reminder switch connector terminal No.4 to the body earth.


  • Check the earth wires for open circuit.

Q. Is the check result normal?

The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).

Repair the wiring harness.

Step 5. Connector check: C-220 ETACS-ECU connector

Q. Is the check result normal?

Go to Step 6.

Repair the defective connector.

Step 6. Check the wiring harness between C-308 key reminder switch connector terminal No.6 to C-220 ETACS-ECU connector terminal No.30.



  • Check the input line for open circuit.

Q. Is the check result normal?

Go to Step 7.

Repair the wiring harness.

Step 7. ETACS switch data by using the SWS monitor
Check the input signal from the key reminder switch.

  • Key reminder switch: OFF (key inserted) to ON (key removed)
Item No.
 Item name
 Normal condition
Item 03
 KEY REMIN SW
 from OFF to ON
OK: Normal condition is displayed.

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.