SYMPTOM PROCEDURES
TSB Revision
SIMPLIFIED WIRING SYSTEM (SWS)
54B-124
STEP 5. Check the input signal by using "FUNCTION
DIAG." menu of the SWS monitor.
Check the input signals from the following switches:
• Ignition switch: ON
• Driver’s door: Open
• Vehicle speed: 8 km/h (5 mph) or more
(1) Operate scan tool MB991958 according to the procedure
below to display "OTHER ALARM"
a. Select "Interactive Diagnosis."
b. Select "System Select."
c. Select "SWS."
d. Select "SWS MONITOR."
e. Select "Function Diag."
f. Select "BUZZER."
g. Select "OTHER ALARM"
(2) Check that normal conditions are displayed for the items
described in the table below.
NOTE: The scan tool MB991958 display changes when the
driver's or the front passenger's door is opened. If any of the
doors are open, the system cannot be checked correctly.
Q: Does scan tool MB991958 display the items "IG SW
(IG1)", "FRONT DOOR SW" and "BUZZER" as normal
condition?
Normal conditions are displayed for all the items : Go to
Step 6.
Normal condition is not displayed for "IG SW (IG1)" :
Refer to Inspection Procedure M-2 "ETACS-ECU
does not receive any signal from the ignition switch
(IG1)
P.54B-470
."
Normal condition is not displayed for "FRONT DOOR
SW" : Refer to Inspection Procedure M-4 "ETACS-ECU
does not receive any signal from the front door
switches
P.54B-477
."
Normal condition is not displayed for "BUZZER" :
Replace the ETACS-ECU. The ignition key reminder
tone alarm function should now work normally.
ITEM NO.
ITEM NAME
NORMAL
CONDITION
ITEM 30
IG SW (IG1)
ON
ITEM 32
FRONT DOOR SW
ON
ITEM 43
BUZZER
ON
AC305411AB
MB991910
DATA LINK
CONNECTOR
MB991827
MB991824
MB991806
MB991812
AC302210
COLUMN SWITCH
CONNECTOR
COLUMN SWITCH
CONNECTOR AT
HARNESS SIDE
MB991812
AB