Inspection Procedure C-5

Central Door Locking System: All the doors do not lock or unlock with just the driver's inside lock knob operation.

Central Door Lock (Door Lock Actuator) Circuit:

TECHNICAL DESCRIPTION
The driver's door lock actuator switch or the ETACS-ECU may be defective.

TROUBLESHOOTING HINTS
- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.
- The driver's door lock actuator switch may be defective.
- The ETACS-ECU may be defective.

DIAGNOSIS

Required Special Tools:
- MB991223: Harness Set
- MB991502: Scan Tool (MUT-II)
- MB991496: Main unit
- MB991497: Test Harness (for communication)

- MB991958: Scan Tool (MUT-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: USB Cable
- MB991911: Main Harness B

Check the input signal (by using the pulse check mode of the monitor).
Check the input signals from the driver's door lock actuator switch.

CAUTION To prevent damage to scan tool MB991502 or MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502 or MB991958.







1. Connect scan tool MB991502 or MB991958 to the data link connector. Refer to "How to connect SWS monitor".
2. When the driver's inside lock knob is locked or unlocked, check if scan tool MB991502 or MB991958 sounds or not.
3. Operate scan tool MB991502 or MB991958 according to the procedure below to display "Pulse check."
a. Select "Interactive Diagnosis."
b. Select "System select."
c. Select "SWS."
d. Select "Pulse Checking."

Q: Does scan tool MB991502 or MB991958 sound when the driver's inside lock knob is locked or unlocked?

YES: Replace the ETACS-ECU. Check that all the doors can be locked or unlocked by operating the driver's inside lock knob.

NO: Refer to Inspection Procedure O-6 "ETACS-ECU does not receive a signal from the driver's door lock actuator switch".