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Mitsubishi Evolution X. Manual - part 973

DOME LIGHT

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CHASSIS ELECTRICAL

54A-253

TROUBLESHOOTING HINTS

• Malfunction of trunk lid latch assembly

• Malfunction of luggage compartment light

• Malfunction of the ETACS-ECU

• The wiring harness or connectors may have

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

DIAGNOSIS

Required Special Tools:

• 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)

STEP 1. Using scan tool MB991958, read the diagnostic
trouble code.

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-241

(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 ETACS,

Diagnosis

P.54A-582

NO : Go to Step 2.

AC608435

Data link connector

MB991827

MB991824

MB991910

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CHASSIS ELECTRICAL

54A-254

STEP 2. Using scan tool MB991958, check data list.
Use the ETACS-ECU service data to check the signal related to
the operation of luggage compartment light.

• Open the trunk lid.

Q: Does scan tool MB991958 display the item "Trunk/gate

trunk ajar switch" as normal condition?
YES : (Normal condition is displayed.) Go to Step 3.
NO : (Normal condition is not displayed.) Troubleshoot the

ETACS-ECU. Refer to ETACS, Diagnosis, Input
signal chart

P.54A-639

STEP 3. Check luggage compartment light connector F-01
for loose, corroded or damaged terminals, or terminals
pushed back in the connector.
Q: Is luggage compartment light connector F-01 in good

condition?
YES : Go to Step 4.
NO : Repair or replace the damaged component(s). Refer

to GROUP 00E, Harness Connector Inspection

P.00E-2

STEP 4. Luggage compartment light bulb check
Check that the luggage compartment light bulb is normal.
Q: Is luggage compartment light bulb normal?

YES : Go to Step 5.
NO : Replace the luggage compartment light bulb.

STEP 5. Check ETACS-ECU connector C-311 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is ETACS-ECU connectors C-311 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

Item No.

Item name

Normal
condition

Item 260

Trunk/gate trunk ajar switch

Open

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CHASSIS ELECTRICAL

54A-255

STEP 6. Check the wiring harness between luggage
compartment light connector F-01 (terminal 1, 2) and
ETACS-ECU connector C-311 (terminal 17, 3).
NOTE: Also check intermediate connector D-17 for loose, cor-
roded, or damaged terminals, or terminals pushed back in the
connector. If intermediate connector D-17 is damaged, repair or
replace the connector as described in GROUP 00E, Harness
Connector Inspection

P.00E-2

Q: Is wiring harness between luggage compartment light

connector F-01 (terminal 1, 2) and ETACS-ECU
connector C-311 (terminal 17, 3) in good condition?
YES : Go to Step 7.
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.

STEP 7. Retest the system
Check that the luggage compartment light illuminates and
extinguishes normally.
Q: Do the trunk room work 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 : Replace the ETACS-ECU.

Inspection Procedure 4: The interior light auto-cut function does not operate correctly.

TECHNICAL DESCRIPTION (COMMENT)

The ETACS-ECU operates the interior light auto-cut
function in accordance with the input signals below.

• Ignition switch (ACC)

• Ignition switch (IG1)

• Door switches

• Trunk lid latch switch

If this function does not work normally, these input
signal circuit(s) or the ETACS-ECU may have a prob-
lem. Also, "Interior light auto cut timer" may be set to
"0min" through customization.

TROUBLESHOOTING HINTS

• Malfunction of door switch

• Malfunction of trunk lid latch assembly

• Malfunction of the dome light

• Malfunction of the ETACS-ECU

• The wiring harness or connectors may have

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

DOME LIGHT

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CHASSIS ELECTRICAL

54A-256

DIAGNOSIS

Required Special Tools:

• 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)

STEP 1. Using scan tool MB991958, Check the
configuration function.

CAUTION

scan tool (M.U.T.-III)

P.54A-241

(2) Turn the ignition switch to the "ON" position.
(3) Use the ETACS-ECU customize function to check to see

which of the followings other than "0min" the "Interior light
auto cut timer" is set.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the check result normal?

YES : Go to Step 2.
NO : Use the ETACS-ECU configuration function to set the

"Interior light auto cut timer" to other than "Disable"
(Refer to

P.54A-258

STEP 2. Using scan tool MB991958, read the ETACS-ECU
diagnostic trouble code.
Check if DTC is set to the ETACS-ECU.
(1) Turn the ignition switch to the "ON" position.
(2) Check whether the ETACS-ECU DTC is set.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?

YES : Diagnose the ETACS-ECU. Refer to ETACS,

Diagnosis

P.54A-582

NO : Go to Step 3.

AC608435

Data link connector

MB991827

MB991824

MB991910

Content .. 971 972 973 974 ..