Mitsubishi Grandis. Manual - part 12

DIAGNOSTIC TROUBLE CODE PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-45

Step 12. Check whether the diagnosis code is 
reset.

Replace the front-ECU, and then check that the 
diagnosis code is not reset.
(1) Replace the front-ECU.
(2) Ignition switch: ON

(3) On completion, check that diagnosis code No.03 

is not reset.

Q: Is diagnosis code No.03 set?

YES : 

Replace the ETACS-ECU.

NO : 

The procedure is complete.

DIAGNOSTIC TROUBLE CODE PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-46

Diagnosis code No.04  Communication error with sunroof-ECU

CAUTION

If diagnosis code No.04 is set in the ETACS-ECU, 
diagnose the CAN bus lines.

DIAGNOSTIC TROUBLE CODE PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-47

TROUBLE JUDGMENT

The ETACS-ECU communicates with the sunroof 
motor assembly (sunroof-ECU) through the SWS 
communication line. If there is any trouble in that 

communication, diagnosis code No.04 will be set.
NOTE: For vehicles without sunroof, diagnosis code 
No.04 does not mean that there is a problem.

IGNITION
SWITCH (IG2)

SUNROOF MOTOR
ASSEMBLY

CPU

ETACS-ECU

FUSIBLE
LINK

5

FUSE
BOX

Sunroof Motor Assembly and SWS Communication Circuit

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

DIAGNOSTIC TROUBLE CODE PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-48

COMMENTS ON TROUBLE SYMPTOM

The sunroof motor assembly (sunroof-ECU), the 
ETACS-ECU, connector(s), or wiring harness 
between the two may be defective.

POSSIBLE CAUSES

• Malfunction of the sunroof motor assembly 

(sunroof-ECU)

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. 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 2.

NO : 

Repair the CAN bus line (Refer to GROUP 
54D 

− Diagnosis 

P.54D-16

).

Step 2.Check whether the diagnosis code is 
reset.

Check again if the diagnosis code is set.
(1) Erase the diagnosis code.
(2) Ignition switch: LOCK (OFF) position to ON
(3) On completion, check that the diagnosis code is 

not reset.

Q: Is the check result normal?

YES : 

If a trouble is solved, it is determined that 

there is an intermittent malfunction such as 
poor engaged connector(s) or open circuit 
(Refer to GROUP 00 

− How to use 

troubleshooting/Inspection Service Points 

P.00-5

).

NO : 

Go to Step 3.

Step 3. Connector check: E-07 sunroof motor 
assembly connector

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Repair the defective connector.

Step 4. Voltage measurement at E-07 sunroof 
motor assembly connector.

(1) Disconnect the connector, and measure at the 

wiring harness side.

AC310651

AB

Connector: E-07 <LHD>             

Harness side

AC310655

AC

Connector: E-07 <RHD>             

Harness side

AC310651

AB

Connector: E-07 <LHD>             

Harness side

AC310655

AC

Connector: E-07 <RHD>             

Harness side