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.
Key reminder function
Central door locking
KOS
Keyless entry system
Room lamp
PROBABLE CAUSES
Malfunction of the front door lock actuator (driver’s
side)
Malfunction of the ETACS-ECU
Damaged harness wires and connectors
DIAGNOSIS PROCEDURE
STEP 1.Connector check: E-20 front door lock actuator (driver’s
side) connector
Q.
Is the check result normal?
Go to Step 2.
Repair the defective connector.
STEP 2. Front door lock actuator (driver’s side) check
Refer to GROUP 42 -
Door .
Q.
Is the check result normal?
Go to Step 3.
Replace the front door lock actuator (driver’s side).
STEP 3. Resistance measurement at the E-20 front door lock actuator
(driver’s side) connector
(1)Disconnect the connector, and measure at the wiring harness side.
(2)<LH drive vehicles> Measure the resistance between the E-20 front door lock
actuator (driver’s side) connector terminal No. 1 and the body earth. OK: Continuity exists (2 Ω
or less)
(3)<RH drive vehicles> Measure the resistance between the E-20 front door lock
actuator (driver’s side) connector terminal No. 3 and the body earth. OK: Continuity exists (2 Ω
or less)
Q.
Is the check result normal?
Go to Step 5.
Go to Step 4.
STEP 4. Wiring harness check between the E-20 front door lock actuator
(driver’s side) connector terminal No. 1 <LH drive vehicles> or 3 <RH drive
vehicles> and the body earth
Check the earth wires for open circuit.
note
Prior to the wiring harness inspection, check intermediate connector C-128, and repair
if necessary.
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 ).
Repair the wiring harness.
STEP 5. Connector check C-301 ETACS-ECU connector
Q.
Is the check result normal?
Go to Step 6.
Repair the defective connector.
STEP 6. Wiring harness check between the E-20 front door lock actuator
(driver’s side) connector terminal No. 3 <LH drive vehicles> or 1 <RH drive
vehicles> and the C-301 ETACS-ECU connector terminal No. 22.
Check the input line for open circuit.
note
Prior to the wiring harness inspection, check intermediate connector C-128, and repair
if necessary.
Q.
Is the check result normal?
Go to Step 7.
Repair the wiring harness.
STEP 7. M.U.T.-III data list
Change the status of driver’s door from unlocked to locked.
Item No.
Item name
Normal condition
Item 271
Dr door unlock switch
Unlock →
Lock
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 ).
)
)
)
)
)
)
Go to Step 2.
Repair the defective connector.
.