Mitsubishi Galant. Manual — part 680

SWS DIAGNOSIS

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-115

NOTE: After checking joint connector C-57, junction block
connectors C-78 and C-84 and intermediate connector C-66,
check the wires. If joint connector C-57, junction block
connectors C-78 and C-84 and intermediate connector C-66,
are damaged, repair or replace them. Refer to GROUP 00E,
Harness Connector Inspection

P.00E-2

.

Q: Are the harness wires between key reminder switch

connector C-59 and battery in good condition?
YES : There is no action to be taken.
NO : Repair or replace them. The ignition key hole

illumination light should work normally.

STEP 10. Check key reminder switch connector C-59 and
ETACS-ECU connector C-86 for damage.
Q: Are key reminder switch connector C-59 and ETACS-

ECU connector C-86 in good condition?
YES : Go to Step 11.
NO : Repair or replace them. Refer to GROUP 00E,

Harness Connector Inspection

P.00E-2

. The ignition

key hole illumination light should work normally.

AC003079 AB

CONNECTOR
BLOCK (LH)

CONNECTOR: C-66

AC003174 AB

CONNECTOR: C-59

COLUMN SWITCH

AC003080 AD

JUNCTION BLOCK
(REAR VIEW)

CONNECTOR: C-86

SWS DIAGNOSIS

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-116

STEP 11. Check the harness wire between key reminder
switch connector C-59 and ETACS-ECU connector C-86.
NOTE: After checking junction block connectors C-77, check
the wires. If junction block connectors C-77, is damaged, repair
or replace them. Refer to GROUP 00E, Harness Connector
Inspection

P.00E-2

.

Q: Is the harness wire between key reminder switch

connector C-59 and ETACS-ECU connector C-86 in
good condition?
YES : There is no action to be taken.
NO : Repair it. The ignition key hole illumination light

should work normally.

AC003174 AB

CONNECTOR: C-59

COLUMN SWITCH

AC003080 AD

JUNCTION BLOCK
(REAR VIEW)

CONNECTOR: C-86

AC003082AI

JUNCTION BLOCK
(FRONT VIEW)

CONNECTOR: C-77

SWS DIAGNOSIS

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-117

Inspection Procedure I-1: Headlight, taillight: Taillights do not illuminate.

CIRCUIT OPERATION
The front-ECU illuminates the taillights if the column
switch sends the taillight ON signal to the front-ECU.

TECHNICAL DESCRIPTION (COMMENT)
The taillight relay, column switch or the front-ECU
may be defective.

NOTE: If only one light does not illuminate, the
harness wire between the light and the taillight relay
may be defective or the light bulb may be burned out.
In this case, check the circuit by referring to GROUP
90, Taillight, Position Light and License Plate Light

P.90-64

.

TROUBLESHOOTING HINTS

•

Malfunction of the taillight relay

•

Malfunction of the column switch (taillight switch)

•

Malfunction of the front-ECU

•

Damaged harness wires or connectors

DIAGNOSIS

Required Special Tools:

•

MB991223: Test Harness Set

AC004210

Taillight Relay Drive Circuit

AC003128 AE

A-09X

CONNECTORS: A-05X, A-09X

FRONT - ECU

A-05X

TAILLIGHT
RELAY

BATTERY

SWS DIAGNOSIS

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-118

•

MB991502: Scan Tool (MUT-II)

•

MB991529: Diagnostic Trouble Code Check Harness

STEP 1. Check the DTC.

Q: Does DTC set when the ignition switch is turned to the

"LOCK" (OFF) position?
YES : Carry out the troubleshooting by referring to

Diagnostic Trouble Code Chart (

P.54B-8

).

NO : Go to Step 2 <when using scan tool MB991502> or 3

<when using a voltmeter>.

STEP 2. Check the input signal (by using scan tool
MB991502).
Check the input signal from the taillight switch.

CAUTION

To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991502.
(1)Connect scan tool MB991502 to the data link connector.
(2)Check that the tone alarm of scan tool MB991502 sounds

when the input signal enters.

Q: Does the tone alarm of scan tool MB991502 sound when

the input signal enters?
YES : Go to Step 4.
NO : Check the taillight switch input signal circuit. Refer to

Inspection Procedure N-14 (

P.54B-258

).

STEP 3. Check the input signal (by using a voltmeter).
Check the input signal from the taillight switch.
(1)Use special tool MB991529 to connect a voltmeter between

ground terminal 4 or 5 and ETACS-ECU terminal 9 of the
data link connector.

(2)Check that the voltmeter indicator deflects once when the

input signal enters.

Q: Does the voltmeter indicator deflect?

YES : Go to Step 4.
NO : Check the taillight switch input signal circuit. Refer to

Inspection Procedure N-14 (

P.54B-258

).

AC003081 AB

16 PIN

MB991502

AC003083

16 PIN

AB

ETACS-ECU
TERMINAL

GROUNDED TERMINAL

MB991529