Mitsubishi Grandis. Manual — part 77

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-305

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) NOT USING SWS MONITOR

54B-306

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) NOT USING SWS MONITOR

54B-307

• 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 lamps 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) NOT USING SWS MONITOR

54B-308

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.54B-275

."

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.
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 4.

Step 4. 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.

Inspection Procedure M-9:Daytime running lamp function does not work normally.

CAUTION

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

COMMENTS ON TROUBLE SYMPTOM

If the daytime running lamp function is not operating
normally the ETACS-ECU power circuit may be
defective or the ETACS-ECU may be defective.

POSSIBLE CAUSES

• The ETACS-ECU may be defective

• Damaged harness wires and connectors

JUMPER
CONNECTOR

ETACS-
ECU

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

Daytime Running Lamp Input Circuit