Inspection Procedure C-2

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, front passenger's or rear 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.
Front passenger's door: Go to Step 5.
Rear door (LH): Go to Step 8.
Rear door (RH): Go to Step 11.







STEP 2. Check the driver's door lock actuator operation.
Remove the driver's door lock actuator to check.

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-86 and driver's door lock actuator connector E-15 for damage.
Q: Are ETACS-ECU connector C-86 and driver's door lock actuator connector E-15 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-86 and driver's door lock actuator connector E-15.

NOTE: After checking junction block connectors C-77 and C-78 and intermediate connector C-68, check the wires. If junction block connectors C-77 and C-78 and intermediate connector C-68 are damaged, repair or replace them. Refer to Harness Connector Inspection.

Q: Are the harness wires between ETACS-ECU connector C-86 and driver's door lock actuator connector E-15 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 front passenger's door lock actuator operation.
Remove the front passenger's door lock actuator to check.

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

YES: Go to Step 6.

NO: Replace the front passenger's door lock actuator. All doors should be locked or unlocked.







STEP 6. Check the ETACS-ECU connector C-86 and front passenger's door lock actuator connector E-07 for damage.
Q: Are ETACS-ECU connector C-86 and front 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-86 and front passenger's door lock actuator connector E-07.

NOTE: After checking junction block connector C-78 and intermediate connector C-72, check the wires. If junction block connector C-78 and intermediate connector C-72 are damaged, repair or replace them. Refer to Harness Connector Inspection.

Q: Are the harness wires between ETACS-ECU connector C-86 and front 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.







STEP 8. Check the rear door lock actuator (LH) operation.
Remove the rear door lock actuator (LH) to check.

Q: Is the rear door lock actuator (LH) in good condition?

YES: Go to Step 9.

NO: Replace the rear door lock actuator (LH). All doors should be locked or unlocked.







STEP 9. Check the ETACS-ECU connector C-86 and rear door lock actuator (LH) connector E-11 for damage.
Q: Are ETACS-ECU connector C-86 and rear door lock actuator (LH) connector E-11 in good condition?

YES: Go to Step 10.

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



















STEP 10. Check the harness wires between ETACS-ECU connector C-86 and rear door lock actuator (LH) connector E-11.

NOTE: After checking junction block connector C-78 and C-84 and intermediate connector C-67 and D-19, check the wires. If junction block connector C-78 and C-84 and intermediate connector C-67 and D-19 are damaged, repair or replace them. Refer to Harness Connector Inspection.

Q: Are the harness wires between ETACS-ECU connector C-86 and rear door lock actuator (LH) connector E-11 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 11. Check the rear door lock actuator (RH) operation.
Remove the rear door lock actuator (RH) to check.

Q: Is the rear door lock actuator (RH) in good condition?

YES: Go to Step 12.

NO: Replace the rear door lock actuator (RH). All doors should be locked or unlocked.







STEP 12. Check the ETACS-ECU connector C-86 and rear door lock actuator (RH) connector E-10 for damage.
Q: Are ETACS-ECU connector C-86 and rear door lock actuator (RH) connector E-10 in good condition?

YES: Go to Step 13.

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
















STEP 13. Check the harness wires between ETACS-ECU connector C-86 and rear door lock actuator (RH) connector E-10.

NOTE: After checking junction block connector C-78 and intermediate connector C-71 and D-07, check the wires. If junction block connector C-78 and intermediate connector C-71 and D-07 are damaged, repair or replace them. Refer to Harness Connector Inspection.

Q: Are the harness wires between ETACS-ECU connector C-86 and rear door lock actuator (RH) connector E-10 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.