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 Switch) Circuit:

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

TROUBLESHOOTING HINTS
- Malfunction of the driver's door lock actuator switch
- Malfunction of the ETACS-ECU
- Damaged harness wires or connectors

DIAGNOSIS

Required Special Tools:
- MB991223: Test Harness Set
- MB991502: Scan Tool (MUT-II)

Check the input signal (by using the Pulse check).
Check the input signals from the driver's door lock actuator switch.




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

1. Connect scan tool MB991502 to the data link connector.
2. When the driver's inside lock knob is locked or unlocked, check if scan tool MB991502 sounds or not.

Q: Does scan tool MB991502 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 M-6 "ETACS-ECU does not receive a signal from the driver's door lock actuator switch."