Mitsubishi Evolution X. Manual — part 971
DOME LIGHT
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CHASSIS ELECTRICAL
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STEP 2. 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)
(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,
.
NO : Go to Step 3.
AC608435
Data link connector
MB991827
MB991824
MB991910
AB
DOME LIGHT
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CHASSIS ELECTRICAL
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STEP 3. Using scan tool MB991958, check data list.
Use the ETACS-ECU data list to check the signals related to
the front dome light.
• Turn the ignition switch to the "LOCK" (OFF) position.
• Remove the ignition key from the ignition key cylinder.
• Open each door.
Q: Does scan tool MB991958 display the items "Dr door
unlock", "IG voltage", "Dr door ajar switch", "As door
ajar switch", "RR door ajar switch", "RL door ajar
switch" and "Handle lock switch" as normal condition?
YES : (Normal conditions are displayed for all items.) Go to
Step 4.
NO : (Normal condition is not displayed.) Troubleshoot the
ETACS-ECU. Refer to ETACS, Diagnosis, Input
signal chart
.
STEP 4. Check front dome light connector D-03 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is front dome light connector D-03 in good condition?
YES : Go to Step 5.
NO : Repair or replace the damaged component(s). Refer
to GROUP 00E, Harness Connector Inspection
STEP 5. Front dome light bulb check
Check that the front dome light bulb is normal.
Q: Is front dome light bulb normal?
YES : Go to Step 6.
NO : Replace the front dome light bulb.
STEP 6. Check ETACS-ECU connector C-316 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is ETACS-ECU connectors C-316 in good condition?
YES : Go to Step 7.
NO : Repair or replace the damaged component(s). Refer
to GROUP 00E, Harness Connector Inspection
Item No.
Item name
Normal condition
Item 228
Dr door unlock
ON
Item 254
IG voltage
0 V
Item 256
Dr door ajar switch
Open
Item 257
As door ajar switch
Open
Item 258
RR door ajar switch
Open
Item 259
RL door ajar switch
Open
Item 264
Handle lock switch
Key in
→ Key out
DOME LIGHT
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CHASSIS ELECTRICAL
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STEP 7. Check the wiring harness between front dome
light connector D-03 (terminal 2, 3) and ETACS-ECU
connector C-316 (terminal 6, 5)
Q: Are wiring harness between front dome light connector
D-03 (terminal 2, 3) and ETACS-ECU connector C-316
(terminal 6, 5) in good condition?
YES : Go to Step 8.
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 8. Check the wiring harness between front dome
light connector D-03 (terminal 1) and body ground.
Q: Is wiring harness between front dome light connector
D-03 (terminal 1) and body ground in good condition?
YES : Replace the front dome light, and then go to Step 9.
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 9. Retest the system
Check that the front dome light illuminates and extinguishes
normally.
Q: Do the front dome light 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
NO : Replace the ETACS-ECU.
DOME LIGHT
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CHASSIS ELECTRICAL
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Inspection Procedure 2: The rear dome light does not illuminate normally.
CAUTION
Whenever the ECU is replaced, ensure that the power supply circuit, the ground circuit and the com-
munication circuit are normal.
.
TROUBLE JUDGMENT
The ETACS-ECU illuminates and extinguishes the
rear dome light in accordance with the input signals
below.
• Ignition switch (IG1)
• Key reminder switch
• Door switches
• Front door lock actuator
.
TECHNICAL DESCRIPTION (COMMENT)
If this does not work normally, the above switch input
circuit(s), rear dome light, or ETACS-ECU may have
a problem.
.
PROBABLE CAUSES
• Malfunction of the key reminder switch
• Malfunction of door switch
• Malfunction of the front door lock actuator (RH)
• Malfunction of rear 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
Rear Dome Light Circuit
ETACS-ECU
REAR
DOME
LIGHT
AC708972AI
Connector: C-316
Junction block
AC708955
Connector: D-07
AX
D-07 (GR)
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