Page 168 of 1500

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-168
CIRCUIT OPERATION
power window regulator motors raise and lower the
door windows when the front passenger's or rear
passenger's sub switch is moved to "UP" or "DOWN"
position.
.
TECHNICAL DESCRIPTION (COMMENT)
A power window sub switch or power window regula-
tor motor may be defective. Or, the power window
lock switch (incorporated in the power window main
switch in the driver’s door) may remain pressed in
the "LOCK" position.
.
TROUBLESHOOTING HINTS
Refer to circuit diagrams GROUP-90
Refer to configuration diagrams GROUP-80
The power window main switch may be defective
The front power window sub switch may be
defective
The rear power window sub switches may be
defective
The front power window regulator motor (RH)
may be defective
The rear power window regulator motors may be
defective
The wiring harness or connectors may have
loose, corroded, or damaged terminals, or termi-
nals pushed back in the connector
DIAGNOSIS
Required Special Tool:
MB991223: Harness Set
STEP 1. Check power window main switch connector E-04
for loose, corroded or damaged terminals, or terminals
pushed back in the connector.
Q: Is power window main switch connector E-04 in good
condition?
YES : Go to Step 2.
NO : Repair or replace the damaged component(s). Refer
to GROUP 00E, Harness Connector Inspection
P.00E-2. When the front power window sub switch
(LH) is operated, the front power window (LH) should
raise and lower normally.
Page 187 of 1500

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-187
INSPECTION PROCEDURE D-5: Power Window: Front or rear passenger's power windows do not
work at all by operating the power window main switch.
.
CIRCUIT OPERATION
When you operate each power window switch for
front or rear passengers (incorporated in the power
window main switch), the corresponding power win-
dow motor operates, opening or closing each power
window.
.
TECHNICAL DESCRIPTION (COMMENT)
If the corresponding power window opens and closes
normally when each power window sub-switch is
operated, the power window main switch may be
defective.
.
TROUBLESHOOTING HINT
Refer to circuit diagrams GROUP-90
Refer to configuration diagrams GROUP-80
The power window main switch may be defective
DIAGNOSIS
Check that power window sub switches operate normally.
Q: A power window cannot work by using the power
window main switch. Can you operate the power
window by using the corresponding power window sub
switch?
YES : Replace the power window main switch. Check that
the front or rear passenger's power window can work
normally by means of power window main switch.
NO : Refer to Symptom Chart P.54B-57 before resolving
this trouble.
KEYLESS ENTRY SYSTEM
GENERAL DESCRIPTION CONCERNING THE KEYLESS ENTRY SYSTEMM1549022000255
The following ECUs affect the functions and control
of the keyless entry system.
FUNCTIONCONTROL
ECU
All door lock function Pressing the transmitter lock button ETACS-ECU
Driver’s door unlock function Pressing the transmitter unlock button once ETACS-ECU
All door unlock function Pressing the transmitter unlock button twice ETACS-ECU
Trunk unlock function Pressing the transmitter trunk button twice ETACS-ECU
Keyless entry hazard answerback and horn answerback function ETACS-ECU
Timed locking mechanism ETACS-ECU
Page 191 of 1500
SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-191
INSPECTION PROCEDURE E-1: Keyless Entry System: Keyless entry system does not operate.
.
CIRCUIT OPERATION
A receiver is incorporated in the ETACS-ECU. This
receiver receives a lock or unlock signal from the
transmitter.
.
TROUBLESHOOTING HINTS
Refer to circuit diagrams GROUP-90
Refer to configuration diagrams GROUP-80
The RKE transmitter may be defective
The ETACS-ECU may be defective
DIAGNOSIS
Required Special Tools:
MB991223: Harness Set
MB991958: diagnostic tool (MUT-III Sub Assembly)
MB991824: Vehicle Communication Interface (V.C.I.)
MB991827: MUT-III USB Cable
MB991910: MUT-III Main Harness A
STEP 1. Verify the central door locking system.
Q: Does the central door locking system work normally?
YES : Go to Step 2.
NO : Refer to Inspection Procedure C-1 "The central door
locking system does not work at all P.54B-122."
Page 193 of 1500
SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-193
INSPECTION PROCEDURE E-2: Keyless Entry System: The dome lamp, the turn-signal lamps and the
horn do not operate through the answerback function.
.
CIRCUIT OPERATION
The ETACS-ECU operates the following functions
when it receives lock or unlock signal from the trans-
mitter:
Dome lamp answerback function
Turn-signal lamp answerback function
Horn answerback function
.
TECHNICAL DESCRIPTION (COMMENT)
The turn-signal lamps and horn answerback func-
tions can be disabled or enabled. However, the dome
lamp answerback function cannot be disabled.
.
TROUBLESHOOTING HINTS
Refer to circuit diagrams GROUP-90
Refer to configuration diagrams GROUP-80
The turn-signal lamp may be defective
The dome lamp may be defective
The horn may be defective
The ETACS-ECU may be defective
The wiring harness or connectors may have
loose, corroded, or damaged terminals, or termi-
nals pushed back in the connector
Page 202 of 1500

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-202
INSPECTION PROCEDURE E-3: Keyless Entry System: Encrypted code cannot be registered.
.
CIRCUIT OPERATION
The ETACS-ECU operates the encrypted code regis-
ter mode according to the following signals:
Key reminder switch
Hazard warning lamp switch
.
TECHNICAL DESCRIPTION (COMMENT)
If the encrypted code register mode cannot be set,
the input circuits from the switches described in
"CIRCUIT OPERATION" or the ETACS-ECU may be
defective.
If the encrypted code register mode can be set but
the transmitter cannot be registered, the transmitter
or the ETACS-ECU may be defective.
.
TROUBLESHOOTING HINTS
Refer to circuit diagrams GROUP-90
Refer to configuration diagrams GROUP-80
The key reminder switch may be defective
The hazard warning lamp switch may be defec-
tive
The transmitter may be defective
The ETACS-ECU may be defective
The wiring harness or connectors may have
loose, corroded, or damaged terminals, or termi-
nals pushed back in the connector
DIAGNOSIS
Required Special Tools:
MB991223: Harness Set
MB991958: diagnostic tool (MUT-III Sub Assembly)
MB991824: Vehicle Communication Interface (V.C.I.)
MB991827: MUT-III USB Cable
MB991910: MUT-III Main Harness A
STEP 1. Verify trouble symptom.
Q: Can the encrypted code register mode be set?
YES : Go to Step 3.
NO : Go to Step 2.
Page 205 of 1500

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-205
INSPECTION PROCEDURE E-4: Keyless Entry System: The trunk is not opened when the keyless
entry transmitter "TRUNK" button is operated.
.
CIRCUIT OPERATION
A receiver is incorporated in the ETACS-ECU. This
receiver receives a lock or unlock signal from the
transmitter.
.
TROUBLESHOOTING HINTS
Refer to circuit diagrams GROUP-90
Refer to configuration diagrams GROUP-80
The RKE transmitter may be defective
The ETACS-ECU may be defective
The wiring harness or connectors may have
loose, corroded, or damaged terminals, or termi-
nals pushed back in the connector
DIAGNOSIS
Required Special Tools:
MB991223: Harness Set
MB991958: diagnostic tool (MUT-III Sub Assembly)
MB991824: Vehicle Communication Interface (V.C.I.)
MB991827: MUT-III USB Cable
MB991910: MUT-III Main Harness A
STEP 1. Check that the doors can be locked and unlocked
by using the keyless entry transmitter.
Q: Can the doors be locked and unlocked normally when
the keyless entry transmitter is operated?
YES : Go to Step 2.
NO : Refer to Inspection Procedure E-1 "Keyless entry
system does not operate P.54B-191."
Page 209 of 1500
SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-209
SUNROOF
GENERAL DESCRIPTION CONCERNING THE SUNROOFM1549021200223
Refer to circuit diagrams GROUP-90
Refer to configuration diagrams GROUP-80The following ECU affects the functions and control
of the sunroof.
Sunroof timer function
The ETACS-ECU enables opening and closing of the sunroof
for 30 seconds after the ignition is switched off.
During this timed operation, if the driver's door or passenger’s
door is opened, the sunroof timer function is deactivated from
that moment. FUNCTION CONTROL ECU
Sunroof timer function ETACS-ECU, sunroof motor assembly
Page 210 of 1500
SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-210
INSPECTION PROCEDURE F-1: Sunroof: Sunroof does not operate.
.
CIRCUIT OPERATION
The sunroof motor assembly is energized
through fusible link (5) by the battery.
When the ignition switch (IG2) signal is on, the
sunroof motor assembly is ready to operate.
.
TROUBLESHOOTING HINTS
Refer to circuit diagrams GROUP-90
Refer to configuration diagrams GROUP-80
The sunroof switch may be defective
The sunroof motor assembly may be defective
The wiring harness or connectors may have
loose, corroded, or damaged terminals, or termi-
nals pushed back in the connector