Mitsubishi Evolution X. Manual — part 1084
THEFT ALARM
TSB Revision
CHASSIS ELECTRICAL
54A-697
.
TECHNICAL DESCRIPTION (COMMENT)
If theft-horn does not sound, the theft-horn input sig-
nal circuit or the ETACS-ECU may be defective.
Also, the theft-alarm function and horn may have
been disabled with a configuration function.
.
TROUBLESHOOTING HINTS
• Theft-alarm horn may be defective
• Theft-alarm 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)
AC708948AJ
Connector: A-59
A-59 (B)
AC708972AP
Connector: C-312
ETACS-ECU
THEFT ALARM
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CHASSIS ELECTRICAL
54A-698
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)
(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
.
NO : Go to Step 2.
STEP 2. Check the theft-alarm horn work normally.
Connect the battery as shown, and verify that the theft-alarm
horn sounds.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Replace the theft-alarm horn. go to Step 3.
STEP 3. Check theft-alarm horn connector A-59 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is theft-alarm horn connector A-59 in good condition?
YES : Go to Step 4.
NO : Repair the damaged parts.
AC608435
Data link connector
MB991827
MB991824
MB991910
AB
AC607630AC
THEFT ALARM
TSB Revision
CHASSIS ELECTRICAL
54A-699
STEP 4. Check theft-alarm horn relay connector A-18X for
loose, corroded or damaged terminals, or terminals
pushed back in the connector.
Q: Is theft-alarm horn relay connector A-18X in good
condition?
YES : Go to Step 5.
NO : Repair the damaged parts.
STEP 5. Check the theft-alarm horn relay.
Refer to
.
Q: Is the theft-alarm horn relay in good condition
YES : Go to Step 6.
NO : Replace the theft-alarm horn relay.
STEP 6. Measure the voltage at theft-alarm horn relay
A-18X.
(1) Remove the relay, and measure at the relay box side.
(2) Measure the voltage between theft-alarm horn relay
connector A-18X (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 8.
NO : Go to Step 7.
STEP 7. Check the Wiring harness between theft-alarm
horn relay connector A-18X (terminal No. 1,4) 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
NO : Repair the wiring harness between theft-alarm horn
relay connector A-18X and fusible link (36).
STEP 8. Check theft-alarm horn connector A-59 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is theft-alarm horn connector A-59 in good condition?
YES : Go to Step 9.
NO : Repair the damaged parts.
AC702831CO
Relay box side: A-18X
THEFT ALARM
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CHASSIS ELECTRICAL
54A-700
STEP 9. Check the Wiring harness between theft-alarm
horn connector A-59 (terminal No. 1) and theft-alarm horn
relay connector A-18X (terminal No. 3).
Check the output lines for open circuit and short circuit.
NOTE: Before the wiring harness check, check intermediate
connector A-09, and then repair them if necessary.
Q: Is the check result normal?
YES : Go to Step 10.
NO : Repair the wiring harness between theft-alarm horn
connector A-59 and theft-alarm horn relay connector
A-18X.
STEP 10. 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 11.
NO : Repair the damaged parts.
STEP 11. Check the Wiring harness between theft-alarm
horn relay connector A-18X (terminal No. 2) and
ETACS-ECU connector C-312 (terminal No. 15).
Check the output lines for open circuit or short circuit.
Q: Is the check result normal?
YES : Go to Step 12.
NO : Repair the wiring harness between theft-alarm horn
relay connector A-18X and ETACS-ECU connector
C-312.
STEP 12. 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
).
NO : Replace the ETACS-ECU.
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