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INSPECTION
PROCEDURE C-1: Central door locking system does not work. |
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|  CAUTION
Whenever the ECU is replaced,
ensure that the input and output signal circuits are normal.
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| COMMENTS ON TROUBLE SYMPTOM
If the central door locking system does not work at all, the driver's door lock
actuator or the ETACS-ECU may be defective.
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| POSSIBLE CAUSES
- Malfunction of the driver's door lock actuator
- Malfunction of the ETACS-ECU
- Damaged harness wires and connectors
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| Step 1. Check the power supply circuit.
When the ignition switch is turned to the LOCK (OFF) position, check if the hazard warning
lamps illuminate.
Q: Is the check result normal?
YES:
Go to Step 2  .
NO:
Refer to inspection procedure A-2 "Check the battery power supply circuit to the
ETACS-ECU  ."
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Check the input signals which are related to the central door locking system.
System switch
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Check conditions
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Driver's door lock actuator switch
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When the driver's key cylinder or inside lock knob is unlocked
or locked
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OK: The MUT-II/III sounds or the voltmeter needle fluctuates.
Q: Is the check result normal?
YES:
Go to Step 3 .
NO:
Refer to inspection procedure P-14 "The driver's door lock actuator switch
signal is not received ."
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| Step 3. Connector check: E-25 driver's door lock actuator connector Q: Is the check result normal?
YES:
Go to Step 4 .
NO:
Repair the defective connector.
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| Step 4. Driver's door lock actuator check
Check that the driver's door lock actuator works normally. Refer to GROUP 42 -
Door .
Q: Is the check result normal?
YES:
Go to Step 5 .
NO:
Replace the driver's door lock actuator.
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| Step 5. Connector check: C-217 ETACS-ECU connector Q: Is the check result normal?
YES:
Go to Step 6 .
NO:
Repair the defective connector.
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| Step 6. Check the wiring harness between C-217 ETACS-ECU connector
terminal No.20 and fusible link (1). NOTE: Prior to the wiring harness inspection, check intermediate connectors A-14, C-125 and
junction block connector C-204, and repair if necessary.
- Check the power supply line for open or short circuit.
Q: Is the check result normal?
YES:
Go to Step 7 .
NO:
Repair the wiring harness.
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| Step 7. Retest the system.
Check that the central door locking system works normally.
Q: Is the check result normal?
YES:
The trouble can be an intermittent malfunction (Refer to GROUP 00 -
How
to Cope with Intermittent Malfunction ).
NO:
Replace the ETACS-ECU.
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