Mitsubishi Grandis. Manual - part 212

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-310

Step 7. Check the wiring harness from A-35 
headlamp (HI: RH) connector terminal No.1 or 
A-21 headlamp (HI: LH) connector terminal No.1, 
A-38 headlamp (LO: RH) connector terminal No.2 
or A-18 headlamp (LO: LH) connector terminal 
No.2 to A-14X front-ECU connector terminal 
Nos.2 and 6.

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-311

AC311521AB

Connector: A-14X

Relay box side

AC310404

AB

Connectors: A-18, A-21 <LHD>

A-18 (B)

A-18

Harness side

A-21 (GR)

A-21

Harness side

AC310399

AB

Connectors: A-18, A-21 <RHD>

A-18 (B)

A-18

Harness side

A-21 (GR)

A-21

Harness side

AC310402

AB

Connectors: A-35, A-38 <LHD>

A-38 (B)

A-35

Harness side

A-35 (GR)

A-38

Harness side

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-312

• Check the output lines for open circuit.

Q: Is the check result normal?

YES : 

Go to Step 8.

NO : 

Repair the wiring harness.

Step 8. Retest the system.
(1) Replace the socket of the defective headlamp.
(2) Check that the headlamps operate 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 headlamp assembly.

Inspection Procedure M-8: The high-beam indicator lamp does not illuminate.

CAUTION

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

COMMENTS ON TROUBLE SYMPTOM

If the high beam indicator does not illuminate 
normally, connector(s), wiring harness in the CAN 
bus lines, the ETACS-ECU or the combination meter 
may be defective.

POSSIBLE CAUSES

• The combination meter may be defective

• The ETACS-ECU may be defective

• Damaged harness wires and connectors

AC310397

AB

Connectors: A-35, A-38 <RHD>

A-38 (B)

A-35

Harness side

A-35 (GR)

A-38

Harness side

INPUT SIGNAL

ETACS-ECU

DIMMER SWITCH

COMBINATION
METER

CAN COMMUNICATION LINE
(CAN_L LINE)

CAN COMMUNICATION LINE
(CAN_H LINE)

High-Beam Indicator Lamp Circuit

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-313

DIAGNOSIS PROCEDURE

Step 1. Check the headlamps.

When the lighting switch is operated, check that the 
headlamps illuminate/go off normally.

Q: Are the headlamps in good condition?

YES : 

Go to Step 2.

NO : 

First, repair the headlamps. Refer to 
Inspection Procedure M-3 "The high-beam 
headlamps do not illuminate normally 

P.54C-278

."

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. ECU check by using the SWS monitor

Check that the power supply and earth lines to the 
ETACS-ECU and the SWS communication lines are 
normal.

• Ignition switch: OFF

ECU TO BE CHECKED

• ETACS ECU

OK: "OK" is displayed on the "ETACS ECU" 
menu.

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Refer to Inspection Procedure A-3 
"Communication with the ETACS-ECU is 
not possible 

P.54C-63

."

Step 5. MUT-III actuator test

Perform the actuator test for the combination meter, 
and check that the high-beam indicator illuminates 
(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.