SYMPTOM PROCEDURES
TSB Revision
SIMPLIFIED WIRING SYSTEM (SWS)
54B-164
INSPECTION PROCEDURE C-6: Central Door Locking System: Forgotten Key Prevention Function
does not Work Normally.
NOTE: This troubleshooting procedure requires 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 forgotten key preven-
tion function according to the following switches:
• Key reminder switch: OFF
• Front door switch: ON
• Front door lock actuator switch: being turned on
The ETACS-ECU operates the forgotten key preven-
tion function under the following conditions:
• Ignition key: inserted into the ignition key cylinder
• Front door: open
• Front door lock: being locked
.
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
DOOR LOCK ACTUATOR
INPUT SIGNAL
·DRIVER'S DOOR LOCK ACTUATOR SWITCH
FUSIBLE
LINK
1
JUNCTION BLOCK SIDE
JUNCTION
BLOCK
ETACS-ECU
·FRONT DOOR SWITCH
·FRONT PASSENGER'S DOOR LOCK
ACTUATOR SWITCH
·KEY REMINDER SWITCH
UNLOCK
RELAY
LOCK
RELAY
( )
( )
Forgotten Key Prevention Circuit