SYMPTOM PROCEDURES
TSB Revision
SIMPLIFIED WIRING SYSTEM (SWS)
54B-108
54B
INSPECTION PROCEDURE B-1: Tone Alarm: Ignition Key Reminder Tone Alarm Function does not
Work Normally.
NOTE: This troubleshooting procedure requires the
use of scan tool MB991958 and SWS monitor kit
MB991813. For details on how to use the SWS mon-
itor, refer to "How to use SWS monitor
P.54B-15
."
.
CIRCUIT OPERATION
The ETACS-ECU operates the ignition key reminder
tone alarm function, based on input signals from the
following switches:
• Ignition switch (IG1): OFF
• Key reminder switch: OFF
• Front door switch (LH): ON
The ETACS-ECU operates the ignition key reminder
tone alarm function under the following conditions:
• Ignition key position: "LOCK" (OFF) position
• Ignition key: Inserted in the ignition key cylinder
• Driver’s door: open
.
TECHNICAL DESCRIPTION (COMMENT)
If the function does not work normally, the input cir-
cuit system from the switches or the ETACS-ECU
may be defective (refer to "CIRCUIT OPERATION").
.
TROUBLESHOOTING HINTS
• Trouble in input signal system
• The wiring harness or connectors may have
loose, corroded, or damaged terminals, or termi-
nals pushed back in the connector
• The ETACS-ECU may be defective
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
• MB991813: SWS Monitor Kit
• MB991806: SWS Monitor Cartridge
• MB991812: SWS Monitor Harness (For Column-ECU)
• MB991822: Probe Harness
Ignition Key Reminder Tone Alarm Function
ETACS-
ECU
· DRIVER'S DOOR SWITCH
· IGNITION SWITCH (IG1)
· KEY REMINDER SWITCH
INPUT SIGNAL
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