Mitsubishi Galant (2004+). Manual - part 336

INPUT SIGNAL PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-535

INSPECTION PROCEDURE N-4: ETACS-ECU does not receive any signal from the door lock key 
cylinder switch.

.

DOOR LOCK 
KEY CYLINDER SWITCH

ETACS-ECU

Door Lock Key Cylinder Switch Input Circuit

AC305231

CONNECTOR: C-26

AL

AC305413

CONNECTOR: C-217

AK

JUNCTION BLOCK

(REAR VIEW)

AC305262

AL

CONNECTOR: E-14

E-14 (B)

INPUT SIGNAL PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-536

CIRCUIT OPERATION
The ETACS-ECU operates the central door locking 
system according to signal from the door lock key 
cylinder switch.

.

TECHNICAL DESCRIPTION (COMMENT)
If the signal is not normal, the systems, which are 
described in "CIRCUIT OPERATION", do not work 
normally.

.

TROUBLESHOOTING HINTS

• The door lock key cylinder switch may be defec-

tive

• 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

DIAGNOSIS

Required Special Tool:

• MB991223: Harness Set

STEP 1. Check door lock key cylinder switch connector 
E-14 for loose, corroded or damaged terminals, or 
terminals pushed back in the connector. 

Q: Is door lock key cylinder switch connector E-14 in good 

condition?
YES : Go to Step 2.
NO :  Repair or replace the damaged component(s). Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

. If the systems described in "CIRCUIT 

OPERATION" work normally, the input signal from the 
door lock key cylinder switch should be normal.

STEP 2. Check the door lock key cylinder switch.

Disconnect door lock key cylinder switch connector E-14. Then 
check continuity between the switch terminals.

Q: Is the door lock key cylinder switch in good condition?

YES : Go to Step 3.
NO :  Replace the door lock key cylinder switch. If the 

systems described in "CIRCUIT OPERATION" work 
normally, the input signal from the door lock key 
cylinder switch should be normal.

AC305262

E-14 (B)

HARNESS SIDE

AN

CONNECTOR: E-14

SWITCH 
POSITION

TESTER 
CONNECTION

SPECIFIED 
CONDITION

LOCK

2 

− 3

Less than 2 ohms

Neutral (OFF)

1 

− 2, 2 − 3

Open circuit

UNLOCK

1 

− 2

Less than 2 ohms

AC210743

1

3

2

INPUT SIGNAL PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-537

STEP 3. Check the ground circuit to the door lock key 
cylinder switch. Measure the resistance at door lock key 
cylinder switch connector E-14.

(1) Disconnect door lock key cylinder switch connector E-14 

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 5.
NO :  Go to Step 4.

AC305262

E-14 (B)

HARNESS SIDE

AN

CONNECTOR: E-14

AC209364JC

CONNECTOR E-14
(HARNESS SIDE)

INPUT SIGNAL PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-538

STEP 4. Check the wiring harness between door lock key 
cylinder switch connector E-14 (terminal 2) and ground.

NOTE: Also check intermediate connector C-26 for loose, cor-
roded, or damaged terminals, or terminals pushed back in the 
connector. If intermediate connector C-26 is damaged, repair or 
replace the connector as described in GROUP 00E, Harness 
Connector Inspection 

P.00E-2

.

Q: Is the wiring harness between door lock key cylinder 

switch connector E-14 (terminals 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. If the 
systems described in "CIRCUIT OPERATION" work 
normally, the input signal from the door lock key 
cylinder switch should be normal.

STEP 5. Check ETACS-ECU connector C-217 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.

Q: Is ETACS-ECU connector C-217 in good condition?

YES : Go to Step 6.
NO :  Repair or replace the damaged component(s). Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

. If the systems described in "CIRCUIT 

OPERATION" work normally, the input signal from the 
door lock key cylinder switch should be normal.

AC305262

E-14 (B)

HARNESS SIDE

AN

CONNECTOR: E-14

AC305231

CONNECTOR: C-26

AK

AC305413AH

CONNECTOR: C-217

HARNESS SIDE

25

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29

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44

JUNCTION BLOCK

(REAR VIEW)