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INSPECTION PROCEDURE A-3: Central Door Locking System does not Operate even when Door Lock Switch of Front Power Window Sub Switch Operated (Door Lock Switch of Power Window Main Switch Operates Normally).
 
 
cautionBefore replacing the ECU, ensure that the power supply circuit, the ground circuit and the communication circuit are normal.
 
 
 
 
 
 
CIRCUIT OPERATION
  • The ETACS-ECU controls the central door locking system, locking or unlocking all doors by activating the central door lock relay (built into the ETACS-ECU). The ETACS-ECU uses inputs from the following components:
    • Door lock actuators (s)
    • Door lock switch, which is incorporated in the front power window sub switch
 
 
TROUBLESHOOTING HINTS
  • The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector
  • The front power window sub switch may be defective
 
 
DIAGNOSIS
Required Special Tools:
  • MB991223: Harness Set
  • MB992006: Extra Fine Probe
STEP 1. Checking central door unlocking operation
Check that the central door locking system works normally.
Is the check result normal?
Go to Step 2.
Refer to Inspection procedure A-1 "Central door locking system does not work at all ."
 
STEP 2. Check front power window sub switch connector F-26 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Is front power window sub switch connector F-26 in good condition?
Go to Step 3.
Repair or check the connector. Refer to GROUP 00E, Harness Connector Inspection . Verify that all the doors can be locked and unlocked normally.
 
STEP 3. Check the front power window sub switch (door lock switch).
Remove the front power window sub switch. Refer to .
 
Switch positionTester connectionSpecified condition
LOCK3 - 4Continuity exists (2 Ω or less)
OFF2 - 4, 3 - 4Open circuit
UNLOCK2 - 4Continuity exists (2 Ω or less)
Does the front power window sub switch work normally?
Go to Step 4.
Replace the front power window sub switch. Verify that all the doors can be locked and unlocked normally.
 
STEP 4. Check the ground circuit to the front power window sub switch. Measure the resistance at front power window sub switch connector F-26.
(1) Disconnect front power window sub switch connector F-26 and measure the resistance available at the wiring harness side of the connector.
(2) Measure the resistance value between terminal 4 and ground.
  • The resistance should be 2 ohms or less.
Is the measured resistance 2 ohms or less?
Go to Step 6.
Go to Step 5.
 
STEP 5. Check the wiring harness between front power window sub switch connector F-26 (terminal No. 4) and ground.
  • Check the ground line for open circuit.
noteAlso check intermediate connector C-211 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-211 is damaged, repair or replace the damaged component(s) as described in GROUP 00E, Harness Connector Inspection .
Is the wiring harness between front power window sub switch connector F-26 (terminal No. 4) and ground in good condition?
Go to Step 8.
The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary.
 
STEP 6. Check ETACS-ECU connector C-415 and C-411 for loose, corroded, damaged terminals or terminals pushed back in the connector.
Are ETACS-ECU connector C-415, C-411 in good condition?
Go to Step 7.
Repair or replace the damaged component(s). Refer to GROUP 00E, Harness Connector Inspection . Check that the sunroof works normally.
 
STEP 7. Check of the wiring harness between the C-415 ETACS-ECU connector terminal No. 15 and the F-26 front power window sub switch connector terminal No. 2, the C-411 ETACS-ECU connector terminal No. 2 and the F-26 front power window sub switch connector terminal No. 3
  • Check the power supply lines for open or short circuit.
noteAlso check intermediate connector C-212 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-212 is damaged, repair or replace the damaged component(s) as described in GROUP 00E, Harness Connector Inspection .
Are the wiring harness between the C-415 ETACS-ECU connector terminal No. 15 and the F-26 front power window main sub connector terminal No. 2, the C-411 ETACS-ECU connector terminal No. 2 and the F-26 front power window sub switch connector terminal No. 3 in good condition?
Go to Step 8.
The wiring harness may be damaged or the connector may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. Verify that the central door locking system works normally.
 
STEP 8. Retest the system.
Check that the central door locking system works normally.
Is the check result normal?
No action is necessary and testing is complete.
Replace the front power window sub switch. Check that the central door locking system normally.