SYMPTOM PROCEDURES
TSB Revision
SIMPLIFIED WIRING SYSTEM (SWS)
54B-127
STEP 6. Check the input signal (by using the pulse check
mode of the monitor).
Check the following switches and input signals:
• Doors switches
(1) Operate scan tool 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."
(2) Check if scan tool MB991958 sounds or not.
Q: When any door switch is operated, does scan tool
MB991958 sound?
YES : Replace the ETACS-ECU. The door ajar warning
buzzer function should now work normally.
NO : Refer to Inspection Procedure N-3 "ETACS-ECU
does not receive any signal from any of the door
switches
P.54B-527
."
ITEM NAME
CONDITION
door switch
Open or close one of the doors
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827