Mitsubishi Galant. Manual — part 697

SWS DIAGNOSIS

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-183

STEP 1. Check the ignition switch (ACC) circuit at the
ETACS-ECU connector C-86.
(1)Disconnect the ETACS-ECU connector C-86 and measure

at the junction block side.

(2)Turn the ignition switch to the "ACC" position.
(3)Measure the voltage between terminal 7 and ground.

Q: Is the voltage approximately 12 volts (battery positive

voltage)?
YES : Replace the ETACS-ECU. The ignition switch (ACC)

input signal should be able to be checked and the
windshield wiper and washer should work normally.

NO : Go to Step 2.

STEP 2. Check ETACS-ECU connector C-86 for damage.
Q: Is ETACS-ECU connector C-86 in good condition?

YES : Go to Step 3.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. The ignition switch

(ACC) input signal should be able to be checked and
the windshield wiper and washer should work
normally.

STEP 3. Check the harness wires between ETACS-ECU
connector C-86 and ignition switch (ACC).
NOTE: After checking junction block connector C-73, check the
wires. If junction block connector C-73 is damaged, repair or
replace it. Refer to GROUP 00E, Harness Connector
Inspection

P.00E-2

.

Q: Are the harness wires between ETACS-ECU connector

C-86 and ignition switch (ACC) in good condition?
YES : There is no action to be taken.
NO : Repair them. The ignition switch (ACC) input signal

should be able to be checked and the windshield
wiper and washer should work normally.

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8

7

6

5

4

3

2

1

AC002149

CONNECTOR C-86
(JUNCTION BLOCK SIDE)

AC

AC003080 AD

JUNCTION BLOCK
(REAR VIEW)

CONNECTOR: C-86

AC003080 AD

JUNCTION BLOCK
(REAR VIEW)

CONNECTOR: C-86

AC003082AD

JUNCTION BLOCK
(FRONT VIEW)

CONNECTOR: C-73

SWS DIAGNOSIS

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-184

Inspection Procedure N-2: The ignition switch (IG1) signal is not sent to the ETACS-ECU.

CURCUIT OPERATION

•

The ETACS-ECU operates various functions
according to the input signal from the ignition
switch (IG1).

•

This circuit will work as a backup circuit if the
battery circuit to the ETACS-ECU is open circuit.

TECHNICAL DESCRIPTION (COMMENT)
The ignition switch (IG1) input signal is used to
operate the following devices or functions:

•

Ignition key reminder tone alarm function

•

Light reminder tone alarm function

•

Seat belt tone alarm function

•

Power window timer function

•

Seat belt warning light

•

Ignition key hole illumination light

•

Headlight automatic shutdown function

•

Turn-signal light

•

Dome light dimming function

TROUBLESHOOTING HINTS

•

Malfunction of the ETACS-ECU

•

Damaged harness wires or connectors

If the signal fails, these devices will not work
normally.

DIAGNOSIS

Required Special Tools:

•

MB991223: Test Harness Set

AC004234

Ignition Switch (IG1) Input Circuit

AC003082AD

JUNCTION BLOCK
(FRONT VIEW)

CONNECTOR: C-73

AC003080 AD

JUNCTION BLOCK
(REAR VIEW)

CONNECTOR: C-86

SWS DIAGNOSIS

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-185

STEP 1. Check the ignition switch (IG1) circuit at the
ETACS-ECU connector C-86.
(1)Disconnect the ETACS-ECU connector C-86 and measure

at the junction block side.

(2)Turn the ignition switch to the "ON" position.
(3)Measure the voltage between terminal 11 and ground.

Q: Is the voltage approximately 12 volts (battery positive

voltage)?
YES : Replace the ETACS-ECU. The ignition switch (IG1)

input signal should be able to be checked and the
functions, which are described in the "Technical
Description (comment)," should work normally.

NO : Go to Step 2.

STEP 2. Check ETACS-ECU connector C-86 for damage.
Q: Is ETACS-ECU connector C-86 in good condition?

YES : Go to Step 3.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. The ignition switch

(IG1) input signal should be able to be checked and
the functions, which are described in the "Technical
Description (comment)," should work normally.

STEP 3. Check the harness wires between ETACS-ECU
connector C-86 and ignition switch (IG1).
NOTE: After checking junction block connector C-73, check the
wires. If junction block connector C-73 is damaged, repair or
replace it. Refer to GROUP 00E, Harness Connector
Inspection

P.00E-2

.

Q: Are the harness wires between ETACS-ECU connector

C-86 and ignition switch (IG1) in good condition?
YES : There is no action to be taken.
NO : Repair them. The ignition switch (IG1) input signal

should be able to be checked and the functions,
which are described in the "Technical Description
(comment)," should work normally.

19

20

18 17 16 15 14 13 12 11 10 9

8

7

6

5

4

3

2

1

AC002150

CONNECTOR C-86
(JUNCTION BLOCK SIDE)

AC

AC003080 AD

JUNCTION BLOCK
(REAR VIEW)

CONNECTOR: C-86

AC003080 AD

JUNCTION BLOCK
(REAR VIEW)

CONNECTOR: C-86

AC003082AD

JUNCTION BLOCK
(FRONT VIEW)

CONNECTOR: C-73

SWS DIAGNOSIS

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-186

Inspection Procedure N-3: The key reminder switch signal is not sent to the ETACS-ECU.

THE KEY REMINDER SWITCH SIGNAL IS NOT
SENT TO THE ETACS-ECU.
The ETACS-ECU operates various functions
according to the input signal from the key reminder
switch.

TECHNICAL DESCRIPTION (COMMENT)
The key reminder switch input signal is used to
operate the following functions or system:

•

Ignition key reminder tone alarm function

•

Forgotten key prevention function

•

Keyless entry system <vehicles with keyless
entry system>

•

Ignition key hole illumination light

•

Dome light dimming function

•

Theft-alarm system <vehicles with theft-alarm
system>

TROUBLESHOOTING HINTS

•

Malfunction of the key reminder switch

•

Malfunction of the ETACS-ECU

•

Damaged harness wires or connectors

If the signal fails, these devices will not work
normally.

DIAGNOSIS

Required Special Tools:

•

MB991223: Test Harness Set

Key Reminder Switch Input Circuit

AC004235

AC003174 AB

CONNECTOR: C-59

COLUMN SWITCH

AC003082AC

JUNCTION BLOCK
(FRONT VIEW)

CONNECTOR: C-82