Inspection Procedure C-1

C-1: Central Door Locking System: Central Door Locking System Does Not Operate.

Door Lock Actuator Circuit <1999 Module>:

Door Lock Actuator Circuit <2000 Module>:

Connectors:

CIRCUIT OPERATE
- 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 (1)) at the ETACS-ECU connector C-86.
1. Disconnect the ETACS-ECU connector C-86 and measure at the junction block side.




2. Measure the voltage between terminal 16 and ground.

Q: Is the voltage approximately 12 volts (battery positive voltage)?

YES: Go to Step 4.

NO: Go to Step 2.




STEP 2. Check the junction block connector C-86 for damage
Q: Is junction block connector C-86 in good condition?

YES: Go to Step 3.

NO: Repair or replace it. Refer to Harness Connector inspection. The central door locking system should work normally.













STEP 3. Check the harness wires between ETACS-ECU connector C-86 and fusible link (1).

NOTE: After checking junction block connector C-85 and intermediate connector C-66, check the wires. If junction block connector C-85 and intermediate connector C-66 are damaged, repair or replace them. Refer to Harness Connector Inspection.

Q: Are the harness wires between ETACS-ECU connector C-86 and fusible link (1) in good condition?

YES: There is no action to be taken.

NO: Repair them. The central door locking system should work normally.




STEP 4. Check the Junction block connector C-86 for damage.
Q: Is junction block connector C-86 in good condition?

YES: Go to Step 5.

NO: Repair or replace it. Refer to Harness Connector inspection. The central door locking system should work normally.










STEP 5. Check the harness wires between ETACS-ECU connector C-86 and intermediate connector C-87.

NOTE: After checking junction block connectors C-84, check the wires. If junction block connectors C-84 is damaged, repair or replace them. Refer to Harness Connector Inspection.

Q: Are the harness wires between ETACS-ECU connector C-86 and Intermediate connector C-87 in good condition?

YES: Replace the ETACS-ECU. The central door locking system should work normally.

NO: Repair them. The central door locking system should work normally.