Mitsubishi Outlander GS45X. Manual - part 216

THEFT ALARM

TSB Revision

CHASSIS ELECTRICAL

54A-861

STEP 1. Using scan tool MB991958, read the diagnostic 
trouble code. 
Check if DTC is set to the ETACS-ECU.

CAUTION

To prevent damage to scan tool MB991958, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958. Refer to "How to connect 

scan too (M.U.T.-III) 

P.54A-839

."

(2) Turn the ignition switch to the "ON" position.
(3) Check whether the ETACS-ECU related DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?

YES : Diagnose the ETACS-ECU. Refer to 

P.54A-733

.

NO :  Go to Step 2.

STEP 2. Check the theft-alarm horn work normally.
Connect the battery as shown, and verify that the horn sounds.
Q: Does horn (HI) work normally?

YES : Go to Step 3.
NO :  Replace the horn (HI). Then, go to Step 4.

STEP 3. Check theft-alarm horn relay connector A-17X for 
loose, corroded or damaged terminals, or terminals 
pushed back in the connector.
Q: Is theft-alarm horn relay connector A-17X in good 

condition?
YES : Go to Step 4.
NO :  Repair the damaged parts.

ZC501967

AC404789

AC702802

MB991824

MB991827

MB991910

Data link

connector

AB

AC607630AC

THEFT ALARM

TSB Revision

CHASSIS ELECTRICAL

54A-862

STEP 4. Check the theft-alarm horn relay.
Refer to 

P.54A-879

.

Q: Is the theft-alarm horn relay in good condition

YES : Go to Step 5.
NO :  Replace the theft-alarm horn relay.

STEP 5. Measure the voltage at theft-alarm horn relay 
A-17X.
(1) Remove the relay, and measure at the relay box side.
(2) Measure the voltage between theft-alarm horn relay 

connector A-17X (terminal No. 1,4) and the body 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 7.
NO :  Go to Step 6.

STEP 6. Check the Wiring harness between theft-alarm 
horn relay connector A-17X (terminal No. 1,4) and fusible 
link (36).
Check the power supply lines for open circuit and short circuit.
Q: Is the check result normal?

YES : The trouble can be an intermittent malfunction (Refer 

to GROUP 00, How to use 
Troubleshooting/inspection Service Points 

− How to 

Cope with Intermittent Malfunction 

P.00-15

).

NO :  Repair the wiring harness between theft-alarm horn 

relay connector A-17X and fusible link (36).

STEP 7. Check theft-alarm horn connector A-58 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.
Q: Is theft-alarm horn connector A-58 in good condition?

YES : Go to Step 8.
NO :  Repair the damaged parts.

STEP 8. Check the Wiring harness between theft-alarm 
horn connector A-58 (terminal No. 1) and theft-alarm horn 
relay connector A-17X (terminal No. 3).
Check the output line for open circuit and short circuit.
NOTE: Before the wiring harness check, check intermediate 
connector A-03, and then repair them if necessary.
Q: Is the check result normal?

YES : Go to Step 9.
NO :  Repair the wiring harness between theft-alarm horn 

connector A-58 and theft-alarm horn relay connector 
A-17X.

AC702831AP

Relay box side: A-17X

THEFT ALARM

TSB Revision

CHASSIS ELECTRICAL

54A-863

STEP 9. Check ETACS-ECU connector C-312 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.
Q: Is ETACS-ECU connector C-312 in good condition?

YES : Go to Step 10.
NO :  Repair the damaged parts.

STEP 10. Check the Wiring harness between theft-alarm 
horn relay connector A-17X (terminal No. 2) and 
ETACS-ECU connector C-312 (terminal No. 15).
Check the output lines for open circuit and short circuit.
Q: Is the check result normal?

YES : Go to Step 11.
NO :  Repair the wiring harness between theft-alarm horn 

relay connector A-17X and ETACS-ECU connector 
C-312.

STEP 11. Replace theft-alarm horn.
(1) Replace the theft-alarm horn.
Q: Does the theft-alarm work normally?

YES : he trouble can be an intermittent malfunction (Refer to 

GROUP 00, How to use Troubleshooting/inspection 
Service Points 

− How to Cope with Intermittent 

Malfunction 

P.00-15

).

NO :  Replace the ETACS-ECU.

THEFT ALARM

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CHASSIS ELECTRICAL

54A-864

Inspection Procedure 4: Horns do not sound while the theft-alarm system is triggered.

CAUTION

Before replacing the ECU, ensure that the power 
supply circuit, the ground circuit and the com-
munication circuit are normal

AC703576

Horn Circuit

ETACS-ECU

RELAYBOX

FUSIBLE
LINK

36

HORN
RELAY

HORN
(LO)

HORN
(HI)

ENGINE
COMPARTMENT

AB

AC702950

AQ

Connector: A-15X <3.0L Engine>

AC709381

AE

Connector: A-15X <2.4L Engine>