Inspection Procedure 4: The front door lock actuator (driver’s side) 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 front door lock actuator (driver’s side) input signal is used for the operation judgement of the functions below. If the signal is abnormal, these functions will not work normally.

PROBABLE CAUSES



DIAGNOSIS PROCEDURE


STEP 1. Front door lock actuator (driver’s side) check


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

Q. Is the check result normal?

Go to Step 2.

Replace the front door latch assembly (driver’s side) (Refer to GROUP 42A - Door Handle and Latch <Double Cab and Single Cab> or <Club Cab>).

STEP 2. Resistance measurement at front door lock actuator (RH) connector (earth terminal)


(1)Disconnect the connector, and measure at the wiring harness side.
(2)Measure the resistance between the door lock actuator (RH) 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 front door lock actuator (RH) 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 DSWL, DSWU line between ETACS-ECU connector and front door lock actuator (RH) 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 status of driver’s door from unlocked to locked.
Item No.
 Item name
 Normal condition
20
 Driver’s door unlock switch
 ON → OFF
21
 Driver’s door lock switch
 OFF → 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 use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).

Replace the ETACS-ECU (Refer to ).