Mitsubishi Grandis. Manual - part 131

INPUT SIGNAL PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-521

AC312037

Connector: C-221  <LHD>

Junction block (Rear view)

AD

Harness side

AC312047

Connector: C-221  <RHD>

Junction block (Rear view)

AD

Harness side

AC310650

AB

Connectors: E-02, E-11

Harness side

E-02

E-11

E-02

E-11

<Vehicles without 
sunroof-LHD>

AC310654

AB

Connectors: E-02, E-11

Harness side

E-02

E-11

E-02

E-11

<Vehicles without 
sunroof-RHD>

AC310652

AB

Connectors: E-02, E-11

Harness side

E-02

E-11

E-02

E-11

<Vehicles with 
sunroof-LHD>

INPUT SIGNAL PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-522

NOTE: 

Prior to the wiring harness inspection, check 
intermediate connector E-11 and C-128, and repair if 
necessary.

• Check the input line for open circuit.

Q: Is the check result normal?

YES : 

Go to Step 7.

NO : 

Repair the wiring harness.

Step 7. Retest the system.
Check that the interior lamp signal is received 
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.

AC310656

AB

Connectors: E-02, E-11

Harness side

E-02

E-11

E-02

E-11

<Vehicles with 
sunroof-RHD>

AC312031

AL

Connector: C-128 <LHD>

AC312043AL

Connector: C-128 <RHD>

INPUT SIGNAL PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-523

Inspection Procedure Q-23: Each switch signal of the keyless entry transmitter is not received.

CAUTION

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

COMMENTS ON TROUBLE SYMPTOM

Input signal from the keyless entry transmitter is 
used to operate the keyless entry system. If the 
signal is abnormal, the keyless entry system will not 
work normally.

POSSIBLE CAUSES

• Malfunction of the keyless entry transmitter

• Defective battery of the keyless entry transmitter

• Malfunction of the ETACS-ECU

DIAGNOSTIC PROCEDURE

Step 1. Pulse check
Check whether the ETACS-ECU receives signal from 
a transmitter or not. For this check, you should use 
the 2-button-type transmitter (integrated with a key), 
which cover screw is silver and has already been 
registered.
NOTE: For how to register the keyless entry 
transmitter encrypted code, refer to GROUP 42 

−

 

On-vehicle Service 

P.42-57

.

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

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Go to Step 4.

Step 2. Check the transmitter battery.
Refer to GROUP 42 

− Keyless entry system 

P.42-60

.

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Replace the keyless entry transmitter 
battery.

Step 3. Register the encrypted code, and then 
retest the system.
(1) Register the keyless entry transmitter again.
(2) Check that each signal is received from the 

keyless entry transmitter.

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 keyless entry transmitter.

Step 4. Retest the system.
Check that each signal is received from the keyless 
entry transmitter.

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.

W3Z10E39AA

KEYLESS ENTRY 
TRANSMITTER

KEYLESS ENTRY 
RECEIVER

ETACS-ECU

Transmitter Input Circuit

System switch

Check condition

Keyless entry transmitter 
"LOCK/UNLOCK" switch

When the switch is 
turned from off to on

INPUT SIGNAL PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-524

Inspection Procedure Q-24: The interior lamp loaded signal is not detected.

CAUTION

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

COMMENTS ON TROUBLE SYMPTOM

The interior lamp automatic-shutdown function 
operates in accordance with the interior lamp loaded 
signal. If this signal is abnormal, the functions below 
will not work normally.

• Ignition key cylinder illumination lamp

• Room lamps

POSSIBLE CAUSES

• Malfunction of the ETACS-ECU

• Damaged wiring harness or connector(s)

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?

Interior Lamp Automatic Shut-off Function Circuit

IGNITION
SWITCH (IG1)

IGNITION
SWITCH (ACC)

RELAY
BOX

<LHD>

<RHD>

· DOOR LAMP
· LUGGAGE
  COMPARTMEMT LAMP
· ROOM LAMP
· REAR PERSONAL LAMP

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

LOAD
DETERMINATION
CIRCUIT

ETACS-ECU

POWER
SOURCE

J/B SIDE

KEEP
RELAY