Mitsubishi Galant 9G. Manual — part 103

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-408

STEP 8. Check fog light (RH) connector A-28 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is fog light (RH) connector A-28 in good condition?

YES : Go to Step 9.
NO : Repair or replace the damaged component(s). Refer

to GROUP 00E, Harness Connector Inspection

P.00E-2

. Check that the fog lights illuminate normally.

STEP 9. Check the fog light bulb (RH).
(1) Remove the fog light bulb (RH).
(2) Verify that the fog light bulb (RH) is not damaged or burned

out.

Q: Is the fog light bulb (RH) in good condition?

YES : Go to Step 10.
NO : Replace the fog light bulb (RH). Verify that the fog

lights illuminate normally.

STEP 10. Check the ground circuit to the fog light (RH).
Measure the resistance at fog light (RH) connector A-28.
(1) Disconnect fog light (RH) connector A-28 and measure the

resistance available at the wiring harness side of the
connector.

(2) Measure the resistance value between terminal 2 and

ground.

• The resistance should be 2 ohms or less.

Q: Is the measured resistance 2 ohms or less?

YES : Go to Step 12.
NO : Go to Step 11.

AC305206

A-28 (B)

HARNESS SIDE

CONNECTOR: A-28

AC

AC305206

A-28 (B)

HARNESS SIDE

CONNECTOR: A-28

AC

AC209364GA

CONNECTOR A-28
(HARNESS SIDE)

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-409

STEP 11. Check the wiring harness between fog light (RH)
connector A-28 (terminal 2) and ground.
Q: Is the wiring harness between fog light (RH) connector

A-28 (terminal 2) and ground in good condition?
YES : No action is necessary and testing is complete.
NO : The wiring harness may be damaged or the

connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary. Verify that
the fog lights illuminate normally.

STEP 12. Check fog light relay connector A-05X for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is fog light relay connector A-05X in good condition?

YES : Go to Step 13.
NO : Repair or replace the damaged component(s). Refer

to GROUP 00E, Harness Connector Inspection

P.00E-2

. Check that the fog lights illuminate normally.

STEP 13. Check the wiring harness between fog light relay
connector A-05X (terminal 4) and fog light (RH) connector
A-28 (terminal 1).
Q: Is the wiring harness between fog light relay connector

A-05X (terminal 4) and fog light (RH) connector A-28
(terminal 1) in good condition?
YES : No action is necessary and testing is complete.
NO : The wiring harness may be damaged or the

connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary. Verify that
the fog lights illuminate normally.

AC305206

A-28 (B)

HARNESS SIDE

CONNECTOR: A-28

AC

AC305979 AB

CONNECTOR: A-05X

RELAY BOX SIDE

FRONT OF VEHICLE

AC305979 AB

CONNECTOR: A-05X

RELAY BOX SIDE

FRONT OF VEHICLE

AC305206

A-28 (B)

HARNESS SIDE

CONNECTOR: A-28

AC

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-410

INSPECTION PROCEDURE J-4: The fog light indicator does not illuminate normally.

NOTE: This troubleshooting procedure requires the
use of scan tool MB991958 and SWS monitor kit
MB991813. For details on how to use the SWS mon-
itor, refer to "How to use SWS monitor

P.54B-15

."

.

CIRCUIT OPERATION

At the same time that the fog lights are illuminated,
the ETACS-ECU sends a signal to illuminate the fog
light indicator via the CAN bus line.

.

TECHNICAL DESCRIPTION (COMMENT)

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

.

TROUBLESHOOTING HINTS

• Trouble in input signal system

• The wiring harness or connectors may have

loose, corroded, or damaged terminals, or termi-
nals pushed back in the connector

• The combination meter may be defective

• The ETACS-ECU may be defective

.

ETACS-
ECU

COMBINATION
METER

FOG LIGHT
SWITCH

CAN COMMUNICATION LINE
(CAN_H LINE)

CAN COMMUNICATION LINE
(CAN_L LINE)

Fog Light Indicator Light Circuit

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-411

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: MUT-III USB Cable

• MB991910: MUT-III Main Harness A

• MB991813: SWS Monitor Kit

• MB991806: SWS Monitor Cartridge

• MB991812: SWS Monitor Harness (For Column-ECU)

• MB991822: Probe Harness

STEP 1. Check the fog lights.
When the fog light switch is operated, check that the fog lights
illuminate/go off normally.
Q: Are the fog lights operating properly?

YES : Go to Step 2.
NO : First, repair the fog lights. Refer to Inspection

Procedure J-3 "One of the fog lights does not
illuminate

P.54B-404

."

STEP 2. Using scan tool MB991958, diagnose the CAN bus
line.

CAUTION

To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958. Refer to "How to connect

SWS monitor

P.54B-13

."

(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the CAN bus line found to be normal?

YES : Go to Step 3.
NO : Repair the CAN bus line (Refer to GROUP 54C,

Diagnosis

P.54C-14

).

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827