Mitsubishi 380. Manual - part 51

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-201

STEP 21. Check the wiring harness between horn relay 
connector A-06X (terminal 4) and horn (HIGH) connector 
A-37 (terminal 1).
Q: Is the wiring harness between horn relay connector 

A-06X (terminal 4) and horn (HIGH) connector A-37 
(terminal 1) in good condition?
YES : Replace the ETACS-ECU. Verify that the horn sounds 

normally.

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 horn sounds normally.

AC305992

RELAY BOX SIDE

CONNECTOR: A-06X

AC

FRONT OF VEHICLE

16DB355A

A-36 (B)

CONNECTOR: A-36,A-37

A-37

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-202

INSPECTION PROCEDURE E-3: Keyless Entry System: Encrypted code cannot be registered.

.

CIRCUIT OPERATION

The ETACS-ECU operates the encrypted code regis-
ter mode according to the following signals:

• Key reminder switch

• Hazard warning lamp switch

.

TECHNICAL DESCRIPTION (COMMENT)

If the encrypted code register mode cannot be set, 
the input circuits from the switches described in 
"CIRCUIT OPERATION" or the ETACS-ECU may be 
defective.
If the encrypted code register mode can be set but 
the transmitter cannot be registered, the transmitter 
or the ETACS-ECU may be defective.

.

TROUBLESHOOTING HINTS

• Refer to circuit diagrams GROUP-

90

• Refer to configuration diagrams GROUP-

80

• The key reminder switch may be defective

• The hazard warning lamp switch may be defec-

tive

• The transmitter may be defective

• The ETACS-ECU may be defective

• The wiring harness or connectors may have 

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

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB991958: diagnostic tool (MUT-III Sub Assembly)

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

• MB991827: MUT-III USB Cable

• MB991910: MUT-III Main Harness A

STEP 1. Verify trouble symptom.

Q: Can the encrypted code register mode be set?

YES : Go to Step 3.
NO :  Go to Step 2.

ETACS-

ECU

· KEY REMINDER SWITCH

· HAZARD WARNING LIGHT SWITCH

Encrypted Transmitter Code Register Mode

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-203

STEP 2. Check the input signal (by using the pulse check 
mode of the monitor).
Check the input signals from the following switches:

• Key reminder switch

• Hazard warning lamp switch

CAUTION

To prevent damage to diagnostic tool MB991958, always 
turn the ignition switch to the "LOCK" (OFF) position 
before connecting or disconnecting diagnostic tool 
MB991958.
(1) Connect diagnostic tool MB991958.Refer to "How to 

connect SWS monitor 

P.54B-13

."

(2) Operate diagnostic tool MB991958 according to the 

procedure below to display "Pulse check."
a. Select "Interactive Diagnosis."
b. Select "System select."
c. Select "SWS."
d. Select "Pulse Checking."

(3) Check the switches (see table below) applicable for the 

input signal check are operated.

(4) Check diagnostic tool MB991958 sounds or not.

Q: When the key reminder switch and the hazard warning 

lamp switch are operated, does diagnostic tool 
MB991958 sound in each case?
Buzzer of diagnostic tool MB991958 sounds normally. : 

Replace the ETACS-ECU. Verify that the encrypted 
code can be registered in the transmitter.

diagnostic tool MB991958 does not sound when the 
ignition key is removed and reinserted : Refer to 

Inspection Procedure N-1 "ETACS-ECU does not 
receive any signal from the key reminder switch 

P.54B-432

."

diagnostic tool MB991958 does not sound when the 
hazard warning lamp switch is turned from "OFF" to 
"ON" : Refer to Inspection Procedure N-2 "ETACS-ECU 

does not receive any signal from the hazard warning 
lamp switch 

P.54B-436

."

ITEM NAME

CHECK CONDITION

Key reminder switch

Remove and reinsert the 
ignition key

Hazard warning lamp switch

Turn the hazard warning lamp 
switch from "OFF" to "ON" 
position.

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-204

STEP 3. Check the transmitter.

Q: When the transmitter's battery is replaced, can the 

encrypted code be registered?
YES : No action is necessary and testing is complete.
NO :  Replace the transmitter. If the encrypted code cannot 

be registered using the new transmitter, replace the 
ETACS-ECU. Verify that the encrypted code can be 
registered in the transmitter.