Mitsubishi Grandis. Manual — part 24
SYMPTOM PROCEDURES
SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR
54B-93
Step 2. Pulse check
Check the input signals below, which are related to
the lamp reminder buzzer function.
OK: The MUT-III sounds or the voltmeter
needle fluctuates.
Q: Are the check result normal?
All the signals are received normally. :
Go to Step
The ignition switch (IG1) signal is not received. :
Refer to inspection procedure Q-2 "The
ignition switch (IG1) signal is not received
The driver's door switch signal is not received. :
Refer to inspection procedure Q-5 "The
driver’s door switch signal is not received
<RH drive vehicles>."
The tail lamp switch signal is not received. :
Refer
to inspection procedure Q-6 "The column
switch (lighting and turn-signal lamp and
headlamp washer switch) signal is not
received
."
The headlamp switch signal is not received. :
Refer to inspection procedure Q-6 "The
column switch (lighting and turn-signal lamp
and headlamp washer switch) signal is not
received
."
Step 3. Retest the system.
The lamp reminder buzzer function should work
normally.
Q: Is the check result normal?
YES :
The trouble can be an intermittent
malfunction (Refer to GROUP 00
− How to
Cope with Intermittent Malfunction
NO :
Replace the ETACS-ECU.
System switch
Check condition
Ignition switch (IG1)
When turned from ACC
to ON
Driver's door switch
When the driver's door is
opened
Tail lamp switch
When the lighting switch
is turned to the TAIL
position
Headlamp switch
When the lighting switch
is turned to the
HEADLAMP position
SYMPTOM PROCEDURES
SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR
54B-94
INSPECTION PROCEDURE B-2: Seat belt warning buzzer function does not work normally.
CAUTION
Whenever the ECU is replaced, ensure that the
input and output signal circuits are normal.
COMMENTS ON TROUBLE SYMPTOM
If the function does not work normally, the input
circuit system from the switches or the ETACS-ECU
may be defective (refer to "CIRCUIT OPERATION").
POSSIBLE CAUSES
• Malfunction of the ETACS-ECU
• Malfunction of the driver's seat belt switch
• Malfunction of the passenger's seat belt switch
• Damaged harness wires and connectors
DIAGNOSTIC PROCEDURE
Step 1. MUT-III diagnosis code
When the ignition switch is turned to the LOCK
(OFF) position, check that the ETACS-ECU does not
set the diagnosis code.
Q: Is the diagnosis code set?
YES :
Refer to diagnosis code chart
NO :
Go to Step 2.
Step 2. Check the seat belt switch, where the seat
belt warning buzzer does not function normally.
Q: Which seat belt switch does not activate the seat
belt warning buzzer?
Driver's seat belt :
Go to Step 3
Passenger's seat belt :
Go to Step 4.
Step 3. Pulse check
Check the input signals, which are related to the seat
belt warning buzzer function.
• Ignition switch: ON
• Driver’s seat belt switch: ON
OK: The MUT-III sounds or the voltmeter
needle fluctuates.
Q: Are the check result normal?
All the signals are received normally. :
Go to Step
The ignition switch (IG1) signal is not received. :
Refer to inspection procedure Q-2 "The
ignition switch (IG1) signal is not received
Driver’s seat belt switch signal is not received :
Refer to inspection procedure Q-19 "The
driver's seat belt switch signal is not
received
<LH drive vehicles> or
<RH drive vehicles>."
Seat Belt Warning Buzzer Function
ETACS-
ECU
· SPEED SIGNAL
· DRIVER'S SEAT BELT SWITCH
COMBINATION
METER
CAN COMMUNICATION LINE
(CAN_L LINE)
CAN COMMUNICATION LINE
(CAN_H LINE)
INPUT SIGNAL
INPUT SIGNAL
· IGNITION SWITCH (IG1)
· PASSENGER'S SEAT BELT SWITCH
System switch
Check condition
Ignition switch (IG1)
When turned from ACC
to ON
Driver’s seat belt switch ON
SYMPTOM PROCEDURES
SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR
54B-95
Step 4. Pulse check
Check the input signals, which are related to the seat
belt warning buzzer function.
• Ignition switch: ON
• Passenger’s seat belt switch and seat occupancy
sensor: ON
OK: The MUT-III sounds or the voltmeter
needle fluctuates.
Q: Are the check result normal?
All the signals are received normally. :
Go to Step
The ignition switch (IG1) signal is not received. :
Refer to inspection procedure Q-2 "The
ignition switch (IG1) signal is not received
Passenger’s seat belt switch signal is not received
:
Refer to inspection procedure Q-20 "The
front passenger's seat belt switch signal is
not received
<LH drive vehicles>
or
<RH drive vehicles>."
Step 5. Pulse check
Check the input signals below which are related to
the seat belt warning buzzer function.
OK: The MUT-III sounds or the voltmeter
needle fluctuates.
Q: Is the check result normal?
YES :
Go to Step 6.
NO :
Refer to inspection procedure Q-25 "The
vehicle speed signal is not received
Step 6. Retest the system.
Check that the seat belt warning buzzer function
work normally.
Q: Is the check result normal?
YES :
The trouble can be an intermittent
malfunction (Refer to GROUP 00
− How to
Cope with Intermittent Malfunction
NO :
Replace the ETACS-ECU.
Inspection Procedure B-3: Door-ajar warning buzzer function does not work normally.
CAUTION
Whenever the ECU is replaced, ensure that the
input and output signal circuits are normal.
COMMENTS ON TROUBLE SYMPTOM
The ETACS-ECU operates this function in
accordance with the input signals below.
System switch
Check condition
Ignition switch (IG1)
When turned from ACC
to ON
Passenger’s seat belt
switch and seat
occupancy sensor
ON
System switch
Check condition
Vehicle speed signal
When the vehicle speed
has reached 10 km/h or
more.
Door-Ajar Warning Buzzer Function
ETACS-
ECU
SPEED SIGNAL
COMBINATION
METER
CAN COMMUNICATION LINE
(CAN_L LINE)
CAN COMMUNICATION LINE
(CAN_H LINE)
INPUT SIGNAL
INPUT SIGNAL
· DOOR SWITCHES
· IGNITION SWITCH (IG1)
· TAILGATE SWITCH
SYMPTOM PROCEDURES
SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR
54B-96
• Ignition switch (IG1)
• All of the door switches
• Vehicle speed signal
If this function does not work normally, these input
signal circuit(s) or the ETACS-ECU may be
defective. Note that this function can be
disabled/enabled by the customize function (default
setting; enabled). In order to change the setting, the
SWS monitor is required.
POSSIBLE CAUSES
• Malfunction of the door switches
• Malfunction of the ETACS-ECU
• Damaged harness wires and connectors
DIAGNOSTIC PROCEDURE
Step 1. Check the power supply circuit.
When the ignition switch is turned to the LOCK
(OFF) position, check if the hazard warning lamps
illuminate.
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Refer to inspection procedure A-2 "Check
the ETACS-ECU battery power supply
circuit
Step 2. Pulse check
Check the input signals below, which are related to
the door-ajar warning buzzer function.
OK: The MUT-III sounds or the voltmeter
needle fluctuates.
Q: Are the check result normal?
All the signals are received normally. :
Go to Step
The ignition switch (IG1) signal is not received. :
Refer to inspection procedure Q-2 "The
ignition switch (IG1) signal is not received"
All the door switch signals are not received. :
Refer to inspection procedure Q-14 "All the
door switch signals are not received"
.
The vehicle speed signal is not received. :
Refer to
inspection procedure Q-25 "The vehicle
speed signal is not received"
.
System switch
Check conditions
Ignition switch (IG1)
When turned from ACC
to ON
Driver's door switch
Driver's door is opened
while all the other doors
are closed.
Passenger’s door switch Passenger's door is
opened while all the
other doors are closed.
Rear door (RH) switch
Rear door (RH) is
opened while all the
other doors are closed
Rear door (LH) switch
Rear door (LH) door is
opened while all the
other doors are closed
Tailgate switch
TAilgate is opened while
all the other doors are
closed
Vehicle speed signal
When the vehicle speed
has reached 10 km/h or
more
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