Inspection Procedure C-1

Door Lock Actuator Circuit:

Connectors:

CIRCUIT OPERATION
- The ETACS-ECU operates the door lock actuators through its dedicated relay (integrated in the ETACS-ECU).
- The ETACS-ECU drives the relay to lock or unlock the door if the requirements are satisfied.

TECHNICAL DESCRIPTION (COMMENT)
The power supply circuit, the circuit shared by door lock actuators, or the ETACS-ECU may be defective.

TROUBLESHOOTING HINTS
- Malfunction of the ETACS-ECU
- Damaged harness wires or connectors

DIAGNOSIS
Required Special Tool:
MB991223: Harness Set




STEP 1. Check the ETACS-ECU power supply circuit [fusible link (2)] at the ETACS-ECU connector C-114.
1. Disconnect the ETACS-ECU connector C-114 and measure at the junction block side.
2. Voltage between terminal 16 and ground.
- Voltage should be approximately 12 volts (battery positive voltage).
If not approximately 12 volts, go to Step 2.
If approximately 12 volts, go to Step 4.




STEP 2. Check the junction block connector C-114 for damage.
If the junction block connector C-114 is damaged, repair or replace it. Refer to Harness Connector Inspection.
The central door locking system should work normally
If the connector is in good condition, go to Step 3.










STEP 3. Check the harness wires between ETACS-ECU connector C-114 and fusible link (2).

NOTE: After checking junction block connector C-110 and intermediate connector C-89, check the wires. If junction block connector C-110 and intermediate connector C-89 are damaged, repair or replace them. Refer to Harness Connector Inspection.

If the harness wires between ETACS-ECU connector C-114 and fusible link (2) are damaged, repair them.
The central door locking system should work normally.




STEP 4. Check the junction block connector C-114 for damage.
If the junction block connector C-114 is damaged, repair or replace it. Refer to Harness Connector Inspection.

The central door locking system should work normally. If the connector is in good condition, go to Step 5.










STEP 5. Check the harness wires between ETACS-ECU connector C-114 and intermediate connector C-91.

NOTE: After checking junction block connector C-104, check the wires. If junction block connector C-104 is damaged, repair or replace it. Refer to Harness Connector Inspection.

If the harness wires between ETACS-ECU connector C-114 and intermediate connector C-91 are damaged, repair them. The central door locking system should work normally.

If the harness wires are in good condition, replace the ETACS-ECU.
The central door locking system should work normally.