INSPECTION PROCEDURE P-14: The passenger’s door key switch signal is not detected. <R.H. drive vehicles>


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


COMMENTS ON TROUBLE SYMPTOM
Input signal from the front passenger’s door key switch is used to operate the central door locking function. If the signal is abnormal, the central door locking function will not work normally.

POSSIBLE CAUSES

  • Malfunction of the front passenger’s door key switch
  • Malfunction of the ETACS-ECU
  • Damaged harness wires and connectors

DIAGNOSTIC PROCEDURE

Step 1. Connector check: F-23 door key switch connector

Q. Is the check result normal?

Go to Step 2.

Repair the defective connector.

Step 2. Check the door key switch.
Refer to GROUP 42 - Door .

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

Step 3. Resistance measurement at the F-23 door key switch connector.

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

(2)Resistance between F-23 door key switch connector terminal No.3 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 F-23 door key switch connector terminal No.3 and body earth.


note Prior to the wiring harness inspection, check intermediate connector C-27, and repair if necessary.

  • Check the earth wires for open circuit.

Q. Is the check result normal?

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 from F-23 door key switch connector terminal Nos. 1 and 2 to C-220 ETACS-ECU connector terminal Nos. 34 and 33.



note Prior to the wiring harness inspection, check intermediate connector C-27, and repair if necessary.

  • Check the input line 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 passenger’s door key switch signal is received normally.

Q. Is the check result normal?
Intermittent malfunction. (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
Replace the ETACS-ECU.