Mitsubishi Evolution X. Manual - part 1085

 

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Mitsubishi Evolution X. Manual - part 1085

 

 

THEFT ALARM

TSB Revision

CHASSIS ELECTRICAL

54A-701

Inspection Procedure 4: Horn (HIGH or LOW) does 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 communi-
cation circuit are normal.

Horn Circuit

ETACS-ECU

RELAYBOX

FUSIBLE
LINK

36

HORN
RELAY

HORN
(LOW)

HORN
(HIGH)

ENGINE
COMPARTMENT

AC709111

Connector: A-16X

AG

AC708949AK

Connector: A-44

A-44 (B)

THEFT ALARM

TSB Revision

CHASSIS ELECTRICAL

54A-702

.

TECHNICAL DESCRIPTION (COMMENT)

If horns do not sound, the horn input signal circuit or 
the ETACS-ECU may be defective.

.

TROUBLESHOOTING HINTS

• Horns may be defective

• Horn relay 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:

• MB992006: Extra fine probe

• MB991223: Harness set

• MB991958: Scan Tool (M.U.T.-III Sub Assembly)

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

• MB991827: M.U.T.-III USB Cable

• MB991910: M.U.T.-III Main Harness A (Vehicles with 

CAN communication system)

AC708948

Connector: A-51

A-51 (B)

AI

AC708972AP

Connector: C-312

ETACS-ECU

THEFT ALARM

TSB Revision

CHASSIS ELECTRICAL

54A-703

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 tool (M.U.T.-III) 

P.54A-685

."

(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-582

.

NO :  Go to Step 2.

STEP 2. Check horn relay connector A-16X for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.
Q: Is horn relay connector A-16X in good condition?

YES : Go to Step 3.
NO :  Repair the damaged parts.

STEP 3. Check the horn relay.
Refer to 

P.54A-706

.

Q: Is the horn relay in good condition

YES : Go to Step 4.
NO :  Replace the theft-alarm horn relay.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

THEFT ALARM

TSB Revision

CHASSIS ELECTRICAL

54A-704

STEP 4. Measure the voltage at horn relay A-16X.
(1) Remove the relay, and measure at the relay box side.
(2) Measure the voltage between horn relay connector A-16X 

(terminal No. 2,4) 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 6.
NO :  Go to Step 5.

STEP 5. Check the Wiring harness between horn relay 
connector A-16X (terminal No. 2,4) and fusible link (36).
Check the power supply line 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 horn relay 

connector A-12X and fusible link (36).

STEP 6. 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 7.
NO :  Repair the damaged parts.

STEP 7. Check the Wiring harness between theft-alarm 
horn relay connector A-16X (terminal No. 1) and 
ETACS-ECU connector C-312 (terminal No. 11).
Check the output lines for open circuit and short circuit.
Q: Is the check result normal?

YES : Go to Step 8.
NO :  Repair the wiring harness between horn relay 

connector A-12X and ETACS-ECU connector C-312.

STEP 8. Check horn (HIGH) connector A-44 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.
Q: Is Horn (HIGH) connector A-44 in good condition?

YES : Go to Step 9.
NO :  Repair the damaged parts.

AC709325 AT

Harness side: A-16X

 

 

 

 

 

 

 

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