INSPECTION PROCEDURE
6: No Door will be Locked or Unlocked by Operating A Lock Switch on any Door, or by touching
The Unlock Sensor.
caution
Before replacing the ECU,
ensure that the power supply circuit, the earth circuit and the communication circuit are normal.
PROBABLE CAUSES
Malfunction of the CAN bus lines
Malfunction of the central door locking system
Malfunction of the keyless operation key
Malfunction of the key reminder switch
Damaged wiring harness and connectors
Malfunction of the KOS-ECU
Function setting error or no setting with a customisation
DIAGNOSTIC PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.
Q.
Is the check result normal?
Go to Step 2.
Repair the CAN bus line (Refer to GROUP 54C -
Troubleshooting ).
STEP 2. M.U.T.-III diagnosis code
Check whether a KOS-related diagnosis code is set.
Q.
Is the diagnosis code set?
Refer to .
Go to Step 3.
STEP 3. Check the central door locking operation
Check that the central door locking system works normally.
Q.
Is the check result normal?
Go to Step 4.
Perform troubleshooting for the central door locking system (Refer to GROUP 42A -
Door -
Troubleshooting ).
STEP 4. Check the customisation
Check that "KOS feature" is set to "Both enable" with a customisation function.
Q.
Is it set to "Both enable"?
Go to Step 5.
Set "KOS feature" to "Both enable" with a customisation function (Refer to ).
STEP 5. Key reminder switch check
(1)Disconnect the C-315 ETACS-ECU connector.
(2)Measure the resistance at the harness-side connector with the ignition key removed
from the ignition key cylinder.
(3)Check the continuity between the C-315 ETACS-ECU connector terminal No. 13 and
the earth. OK: Continuity exists (2 Ω
or less)
Q.
Is the check result normal?
Go to Step 6.
Check the C-209 key reminder switch connector, the C-315 ETACS-ECU connector,
the wiring harness between the C-211 key reminder switch connector (terminal No. 3) and the
C-315 ETACS-ECU connector (terminal No. 13), and between the C-211 key reminder switch connector (terminal
No. 2) and the earth. If they are normal, replace the key reminder switch.
STEP 6. Check with another registered keyless operation key.
Q.
Does the IG knob turn? (Is the keyless operation key recognised?)
Replace the keyless operation key with which the IG knob does not turn (no recognition)
and register the ID codes (Refer to ).
Go to Step 7.
STEP 7. Check of the troubles
Operate the lock switch and check that the door can be locked and unlocked. Also, check
that the unlock sensor can lock and unlock the door.
Q.
Is the check result normal?
The diagnosis is complete.
Replace KOS-ECU and register the ID codes (Refer to ).
)
)
)
)
)
Go to Step 2.
Repair the CAN bus line (Refer to GROUP 54C -
Troubleshooting 
).