Mitsubishi Grandis. Manual — part 91

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-361

Step 7. Check the wiring harness from A-32 front
fog lamp (RH) connector or A-24 front fog lamp
(LH) connector terminal No.2 to A-08X front fog
lamp relay connector terminal No.4.

AC311521AD

Connector: A-08X

1

3

2

4

Front of
vehicle

Relay box side

AC310403

A-24 (B)

AG

Connector: A-24 <LHD>

Harness side

AC310398

A-24 (B)

AG

Connector: A-24 <RHD>

Harness side

AC310401

Connector: A-32 <LHD>

Harness side

A-32 (B)

AC

AC310396

Connector: A-32 <RHD>

Harness side

A-32 (B)

AC

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-362

• 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.

Check that the front fog lamp illuminate 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 front fog lamp(s).

INSPECTION PROCEDURE O-4: The front fog lamp indicator does not illuminate normally.

CAUTION

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

COMMENTS ON TROUBLE SYMPTOM

If the front fog lamp 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 CAN bus line is defective.

• The combination meter may be defective

• The ETACS-ECU may be defective

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. Check the front fog lamps.
When the front fog lamp switch is operated, check
that the front fog lamps illuminate/go off normally.

Q: Is the check result normal?

YES :

Go to Step 2.

NO :

First, repair the front fog lamps. Refer to
Inspection Procedure O-3 "Any of the front
fog lamps does not illuminate

P.54B-356

."

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. 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?

INPUT SIGNAL

ETACS-ECU

COMBINATION
METER

CAN COMMUNICATION LINE
(CAN_L LINE)

CAN COMMUNICATION LINE
(CAN_H LINE)

Front Fog Lamp Indicator Lamp Circuit

FRONT FOG LAMP
SWITCH

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-363

YES :

Refer to diagnosis code chart

P.54B-29

.

NO :

Go to Step 5.

Step 5. MUT-III actuator test
Perform the actuator test for the combination meter,
and check that the front fog lamp 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.

INSPECTION PROCEDURE O-5: The Rear fog lamp indicator does not illuminate normally.

CAUTION

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

COMMENTS ON TROUBLE SYMPTOM

If the rear fog lamp 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 CAN bus line is defective.

• The combination meter may be defective

• The ETACS-ECU may be defective

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. Check the rear fog lamps.
When the rear fog lamp switch is operated, check
that the rear fog lamps illuminate/go off normally.

Q: Are the fog lamps operating properly?

YES :

Go to Step 2.

NO :

Refer to Inspection Procedure O-2 "The rear
fog lamps do not illuminate normally

P.54B-345

."

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.

INPUT SIGNAL

ETACS-ECU

COMBINATION
METER

CAN COMMUNICATION LINE
(CAN_L LINE)

CAN COMMUNICATION LINE
(CAN_H LINE)

Rear Fog Lamp Indicator Lamp Circuit

REAR FOG LAMP
SWITCH

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-364

Step 4. 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

P.54B-29

.

NO :

Go to Step 5.

Step 5. MUT-III actuator test
Perform the actuator test for the combination meter,
and check that the rear fog lamp 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.

ROOM LAMP

Inspection Procedure P-1: The interior lamps (room ramp, rear personal lamps, door lamps, luggage
compartment lamp, key illumination lamp) does not illuminate or extinguish normally.

CAUTION

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

KEY CYLINDER
ILLUMINATION
LAMP

· ROOM LAMP

· DOOR LAMP
· LUGGAGE
COMPARTMENT
LAMP

· REAR PERSONAL
LAMP

KEEP RELAY

LOAD
DETERMINATION
CIRCUIT

J/B SIDE

ETACS-ECU

FUSIBLE
LINK

26

Interior Lamp Circuit <with keyless entry system>