Mitsubishi Grandis. Manual - part 104

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-413

Step 2. Pulse check
Check the input signals below, which are related to 
the front and rear dome lamps.

OK: The MUT-III sounds or the voltmeter 
needle fluctuates.

Q: Is the check result normal?

All the signals are received normally. : 

Go to Step 

3.

The ignition switch (ACC) signal is not received. : 

Refer to inspection procedure Q-1 "The 
ignition switch (ACC) signal is not received 

P.54B-416

."

The ignition switch (IG1) signal is not received. : 

Refer to inspection procedure Q-2 "The 
ignition switch (IG1) signal is not received 

P.54B-420

."

All the door switch signals are not received. : 

Refer to inspection procedure Q-14 "All the 
door switch signals are not received 

P.54B-469

."

Interior lamp loaded signal is not detected : 

Refer 

to inspection procedure Q-24 "Interior lamp 
loaded signal is not detected 

P.54B-524

."

Step 3. Customize function by using the SWS 
monitor.
Check that the interior lamp automatic-shutdown 
function has been enabled by using the adjustment 
function.

CAUTION

The SWS monitor must be used in order to 
confirm and change that setting. Use the SWS 
monitor to confirm and/or change the 
customized function.

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Enable the interior lamp 
automatic-shutdown function by using the 
SWS monitor customize function (Refer to 
GROUP 54C 

− Customize function 

P.54C-574

).

Step 4. Retest the system.
Check that the interior lamp automatic-shutdown 
function works 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 

P.00-5

).

NO : 

Replace the ETACS-ECU.

System switch

Check condition

Ignition switch (ACC)

When turned from the 
LOCK (OFF) position to 
the ACC position

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

Interior lamp loaded 
signal

When a load is applied 
through multi-purpose 
fuse No.18

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-414

Inspection Procedure P-7: The door-ajar warning lamp does not illuminate/extinguish normally.

CAUTION

Whenever the ECU is replaced, ensure that the 
input and output signal circuits are normal.

COMMENTS ON TROUBLE SYMPTOM

If the door-ajar warning lamp does not work normally, 
these input signal circuits or the ETACS-ECU may be 
defective.

POSSIBLE CAUSES

• The combination meter may be defective

• The ETACS-ECU may be defective

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. Check the door lamp.
When the door is opened or closed, check that the 
door lamp illuminate/go off normally.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Refer to Inspection Procedure P-5 "The 
door lamp illuminate normally 

P.54B-399

."

Step 2. MUT-III CAN bus diagnostics.
Use the MUT-III to diagnose the CAN bus lines.

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Repair the CAN bus line (Refer to GROUP 
54D, Diagnosis 

P.54D-16

).

Step 3. Check for combination meter diagnosis 
code.
Check whether the combination meter-related 
diagnosis code is set.

Q: Is the diagnosis code set?

YES : 

Diagnose the combination meter (Refer to 

GROUP 54A 

− Troubleshooting 

P.54A-35

).

NO : 

Go to Step 4.

Step 4. 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 5.

NO : 

Refer to inspection procedure A-2 "Check 
the ETACS-ECU battery power supply 
circuit 

P.54B-87

."

ETACS-
ECU

SPEED SIGNAL

COMBINATION
METER

CAN COMMUNICATION LINE
(CAN_L LINE)

CAN COMMUNICATION LINE
(CAN_H LINE)

INPUT SIGNAL

INPUT SIGNAL

· IGNITION SWITCH (IG1)
· ALL DOOR SWITCH
· TAILGATE SWITCH

Door-Ajar Warning Lamp Function

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-415

Step 5. Pulse check
Check the input signals below, which are related to 
the door-ajar warning lamp.

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 

6.

The ignition switch (IG1) signal is not received. : 

Refer to inspection procedure Q-2 "The 
ignition switch (IG1) signal is not received" 

P.54B-420

.

All the door switch or tailgate switch signals are 
not received. : 

Refer to inspection procedure Q-14 

"All the door switch signals are not received 

P.54C-505

".

The vehicle speed signal is not received. : 

Refer to 

inspection procedure Q-25 "The vehicle 
speed signal is not received" 

P.54B-529

.

Step 6. MUT-III actuator test
Perform the actuator test for the combination meter, 
and check that the door-ajar warning lamp illuminate 
(Refer to GROUP 54A 

− Combination Meter 

P.54A-78

).

Q: Is the check result normal?

YES : 

Replace the ETACS-ECU.

NO : 

Replace the combination meter.

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

Tailgate switch

A tailgate opened

Vehicle speed signal

When the vehicle speed 
has reached 10 km/h or 
more

INPUT SIGNAL PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-416

INPUT SIGNAL PROCEDURES

Inspection Procedure Q-1: The ignition switch (ACC) signal is not received.

CAUTION

Whenever the ECU is replaced, ensure that the 
input signal circuit is normal.

Ignition Switch (ACC) Input Circuit <LHD>

Wire colour code
B : Black     LG : Light green     G : Green     L : Blue     W : White     Y : Yellow     SB : Sky blue
BR : Brown     O : Orange     GR : Gray     R : Red     P : Pink     V : Violet

ETACS-ECU

IGNITION
SWITCH (ACC)

J/B SIDE

RELAY
BOX