Inspection Procedure 2

None of the Door Lock Function Operate.










CIRCUIT OPERATION
The ETACS-ECU power is supplied from fusible link number 8.

TECHNICAL DESCRIPTION (COMMENT)
The cause may be a malfunction of the ETACS-ECU power supply circuit system or of the ground circuit system.

TROUBLESHOOTING HINTS
- Malfunction of the ETACS-ECU
- Damaged wiring harness or connector

DIAGNOSIS
Required Special Tool:
- MB991223: Harness Set







STEP 1. Measure the power supply line voltage at junction block connector D-11.
1. Remove the ETACS-ECU and measure at the junction block side.
2. Measure the voltage between terminal 1 and ground, and between terminal 2 and ground.
- The measured value should be approximately 12 volts (battery positive voltage).

Q: Does the measured voltage correspond with this range?
YES: Go to Step 3.
NO: Go to Step 2.







STEP 2. Check ETACS-ECU connector D-11 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Are the connectors and terminals in good condition?
YES: Go to step 3.
NO: Repair or replace damaged components. Refer to Harness Connector inspection. Then go to Step 6.













STEP 3. Check the harness wires between fusible link number 8 and ETACS-ECU connector D-11 (terminal No.1 and 2).

NOTE: After inspecting intermediate connector A-54X, junction block connector D-01 or D-02 inspect the wire. If intermediate connector A-54X, junction block connector D-01 or D-02 is damaged, repair or replace it. Refer to Harness Connector Inspection. Then go to Step 6.

Q: Are there any damaged wires between fusible link number 8 and ETACS-ECU connector D-11 (terminal No.1 and 2)?
YES: Repair or replace the harness wire, then go to Step 6.
NO: Go to Step 4.







STEP 4. Check ETACS-ECU connector D-11 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is ETACS-ECU connector D-11 in good condition?
YES: Go to step 5.
NO: Repair or replace the damaged components. Refer to Harness Connector Inspection. Then go to Step 6.










STEP 5. Check the harness wires between ETACS-ECU connector D-11 and ground.

NOTE: After inspecting junction block connector D-13 inspect the wire. If junction block connector D-13 is damaged, repair or replace it. Refer to Harness Connector Inspection. Then go to Step 6.

Q: Is the harness wire between ETACS-ECU connector D-11 and ground damaged?
YES: Repair or replace the harness wire. Then go to Step 6.
NO: Replace the ETACS-ECU. Then go to Step 6.

STEP 6. Retest the system.

Q: Does the door lock function operate normally?
YES: The procedure is complete.
NO: Return to Step 1.