Inspection Procedure 13: The door lock switch signal is not received.

caution

Before replacing the ECU, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.

COMMENTS ON TROUBLE SYMPTOM

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

Central door locking

PROBABLE CAUSES

Malfunction of the door lock switch {built in the front door power window switch (main)}
Damaged harness wires and connectors
Malfunction of the ETACS-ECU

DIAGNOSIS PROCEDURE

STEP 1. Door lock switch check.

Refer to GROUP 42A - Door, Door Handle and Latch, Inspection

Q. Is the check result normal?

	Go to Step 2.

	Replace the door lock switch {built in the front door power window switch (main)} (Refer to GROUP 52A - Trim, Door Trim).

STEP 2. Resistance measurement at door lock switch connector (earth terminal).

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

(2)Measure the resistance between the door lock 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 door lock switch connector and 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 D-LS, DSWL line between ETACS-ECU connector and door lock 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.

Change the input signals from the door lock switch.

Item No.	Item name	Normal condition
113	Central door lock switch	OFF to ON (Only when switch is operated)
114	Central door unlock switch	OFF to ON (Only when switch is operated)

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.