Mitsubishi Galant 9G. Manual - part 113

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-448

STEP 5. Check at ETACS-ECU connector C-218 in order to 
check the ignition key hole illumination light circuit.
(1) Disconnect ETACS-ECU connector C-218, and measure at 

the wiring harness side.

(2) The ignition key hole illumination light should illuminate 

when terminal 69 is grounded.

Q: Does the ignition key hole illumination light illuminate?

YES : Replace the ETACS-ECU. Verify that the ignition key 

hole illumination light illuminates normally.

NO :  Go to Step 6.

STEP 6. Check key reminder switch connector C-310 for 
loose, corroded or damaged terminals, or terminals 
pushed back in the connector.
Q: Is key reminder switch connector C-310 in good 

condition?
YES : Go to Step 7.
NO :  Repair or replace the damaged component(s). Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

. Verify that the ignition key hole illumination 

light illuminates normally.

STEP 7. Check the ignition key hole illumination light bulb.
Q: Is the ignition key hole illumination light bulb in good 

condition?
YES : Go to Step 8.
NO :  Replace the bulb. Verify that the ignition key hole 

illumination light illuminates normally.

AC305413AN

CONNECTOR: C-218

JUNCTION BLOCK
(REAR VIEW)

C-218 (GR)

HARNESS SIDE

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CONNECTOR C-218
(HARNESS SIDE)

AB

AC305235AF

CONNECTOR: C-310

HARNESS SIDE

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-449

STEP 8. Check the key reminder switch (ignition key hole 
illumination).
(1) Disconnect key reminder switch connector C-310.
(2) Remove the ignition key hole illumination light bulb. Then 

measure the resistance value between the bulb terminals.

(3) Install a bulb to the key remainder switch, and measure the 

resistance between connector C-310 terminals 1 and 2. The 
measured resistance value should be roughly the same as 
the value measured in Step (2).

Q: Are these two resistance values extremely different?

YES : Replace the key reminder switch. Verify that the 

ignition key hole illumination light illuminates normally.

NO :  <Nearly equal> Go to Step 9.

STEP 9. Check the battery power supply circuit to the key 
reminder switch circuit. Measure the voltage at key 
reminder switch connector C-310.
(1) Disconnect key reminder switch connector C-310, and 

measure the voltage available at the wiring harness side of 
the connector.

(2) Measure the voltage between terminal 2 and ground.

• The voltage should measure approximately 12 volts 

(battery positive voltage).

Q: Is the measured voltage approximately 12 volts (battery 

positive voltage)?
YES : Go to Step 11.
NO :  Go to Step 10.

STEP 10. Check the wiring harness between key reminder 
switch connector C-310 (terminal 2) and battery.

AC305235AF

CONNECTOR: C-310

HARNESS SIDE

AC305235AF

CONNECTOR: C-310

HARNESS SIDE

AC209364

CONNECTOR C-310
(HARNESS SIDE)

GY

AC305235AF

CONNECTOR: C-310

HARNESS SIDE

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-450

NOTE: Also check joint connector C-01 and intermediate con-
nector C-29 for loose, corroded, or damaged terminals, or ter-
minals pushed back in the connector. If joint connector C-01 or 
intermediate connector C-29 is damaged, repair or replace the 
connector as described in GROUP 00E, Harness Connector 
Inspection 

P.00E-2

.

Q: Is the wiring harness between key reminder switch 

connector C-310 (terminal 2) and battery 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 ignition key hole illumination light illuminates 
normally.

STEP 11. Check the wiring harness between key reminder 
switch connector C-310 (terminal 1) and ETACS-ECU 
connector C-218 (terminal 69).
Q: Is the wiring harness between key reminder switch 

connector C-310 (terminal 1) and ETACS-ECU connector 
C-218 (terminal 69) 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 ignition key hole illumination light illuminates 
normally.

AC305232

CONNECTORS: C-01, C-29

C-01

C-29

C-01

C-29

AK

AC305413AN

CONNECTOR: C-218

JUNCTION BLOCK
(REAR VIEW)

C-218 (GR)

HARNESS SIDE

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AC305235AF

CONNECTOR: C-310

HARNESS SIDE

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-451

INSPECTION PROCEDURE K-5: Interior Light: The interior light automatic shutoff  function does not 
work 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

The ETACS-ECU operates the interior light auto-
matic shutdown function according to the following 
switch signals:

• Ignition switch (ACC)

• Ignition switch (IG1)

• Front door switch (LH)

• Door switches

• interior light loaded signal

.

TECHNICAL DESCRIPTION (COMMENT)

If the function does not work normally, the input cir-
cuit system from the switches or the ETACS-ECU 
may be defective (refer to "CIRCUIT OPERATION").

.

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 ETACS-ECU may be defective

22

RELAY BOX
(FUSE     )

NOTE

WITHOUT SUNROOF
WITH SUNROOF

ETACS-
ECU

KEEP RELAY

· 

ALL DOOR 

  SWITCH
· IGNITION 
  SWITCH (IG1)
· IGNITION 
  SWITCH (ACC)
· 

INTERIOR LIGHT 

  LOADED SIGNAL

· 

MAP LIGHT ASSEMBLY

· OVERHEAD CONSOLE 

 ASSEMBLY

· 

REAR DOME LIGHT

· 

TRUNK LIGHT

INTERIOR 
LAMP CUT

BACK-UP
CIRCUIT

LOAD

DETERMINATION
CIRCUIT

JUNCTION BLOCK SIDE

JUNCTION BLOCK

INPUT SIGNAL

Interior Light Automatic Shutoff Function Circuit