Inspection Procedure C-5

Central Door Locking System: All the doors do not lock 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 driver's door lock actuator switch may be defective
- The ETACS-ECU may be defective
- The wiring harness or connectors may have loose, corroded or damaged terminals, or terminals pushed back in the connector

DIAGNOSIS

Required Special Tools:
- MB991223: Harness Set
- MB991958: Scan Tool (MUT-III Sub Assembly)
- MB991824: Vehicle Communication Interface (V.C.I.)
- MB991827: MUT-III USB Cable
- MB991910: MUT-III Main Harness A

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




1. Connect scan tool MB991958 to the data link connector (16-pin).
2. Operate the scan tool MB991958 as follows:
a. Select "SYSTEM SELECT."
b. Select "SWS."
c. Select "PULSE CHECK."

3. Lock or unlock the driver's inside lock knob.
4. Check the scan tool MB991958 sounds or not.

Q: Does scan tool MB991958 sound when the driver's inside lock knob is locked or unlocked, or the passenger's side lock knob is moved from the lock to the unlock position?

YES: Replace the ETACS-ECU. Verify 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."