Inspection Procedure C-2

Central door locking system: Some doors do not lock or unlock.

Door Lock Actuator Circuit
Refer to inspection Procedure C-1.

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 door lock actuator, or the harness wire between ETACS-ECU and the door lock actuator may be defective.

TROUBLESHOOTING HINTS
- Malfunction of the driver's or passenger's door lock actuator
- Malfunction of the ETACS-ECU
- Damaged harness wires or connectors

DIAGNOSIS

Required Special Tool:
- MB991223: Test Harness Set

STEP 1. Check the location of malfunction.

Q: Which door lock does not function?

Driver's door: Go to Step 2.
Passenger's door: Go to Step 5.







STEP 2. Check the driver's door lock actuator operation
Remove the driver's door lock actuator to check. (Refer to Door - Door Handle and Latch)

Q: Is the driver's door lock actuator in good condition?

YES: Go to Step 3.
NO: Replace the driver's door lock actuator. All doors should be locked or unlocked.







STEP 3. Check the ETACS-ECU connector C-311 and driver's door lock actuator connector E-13 for damage.

Q: Are ETACS-ECU connector C-311 and driver's door lock actuator connector E-13 In good condition?

YES: Go to Step 4.
NO: Repair or replace them. Refer to Harness Connector Inspection. All doors should be locked or unlocked.













STEP 4. Check the harness wires between ETACS-ECU connector C-311 and driver's door lock actuator connector E-13.

NOTE: After checking junction block connectors C-303 and C-308 and intermediate connector C-211, check the wires. If junction block connectors C-303 and C-308 and intermediate connector C-211 are damaged, repair or replace them. Refer to Harness Connector Inspection.

Q: Are the harness wires between ETACS-ECU connector C-311 and driver's door lock actuator connector E-13 in good condition?

YES: Replace the ETACS-ECU. All doors should be locked or unlocked.
NO: Repair them. All doors should be locked or unlocked.







STEP 5. Check the passenger's door lock actuator operation.
Remove the passenger's door lock actuator to check. (Refer to Door - Door Handle and Latch)

Q: Is the passenger's door lock actuator in good condition?

YES: Go to Step 6.
NO: Replace the passengers door lock actuator. All doors should be locked or unlocked.







STEP 6. Check the ETACS-ECU connector C-311 and passenger's door lock actuator connector E-07 for damage.

Q: Are ETACS-ECU connector C-311 and passenger's door lock actuator connector E-07 in good condition?

YES: Go to Step 7.
NO: Repair or replace them. Refer to Harness Connector Inspection. All doors should be locked or unlocked.













STEP 7. Check the harness wires between ETACS-ECU connector C-311 and passenger's door lock actuator connector E-07.

NOTE: After checking junction block connector C-308 and intermediate connector C-213, check the wires. If junction block connector C-308 and intermediate connector C-213 are damaged, repair or replace them. Refer to Harness Connector Inspection.

Q: Are the harness wires between ETACS-ECU connector C-311 and passenger's door lock actuator connector E-07 in good condition?

YES: Replace the ETACS-ECU. All doors should be locked or unlocked.
NO: Repair them. All doors should be locked or unlocked.