Mitsubishi Galant. Manual — part 574
SUNROOF
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BODY
42-79
INSPECTION PROCEDURE 3: The sunroof motor does not operate.
CIRCUIT OPERATION
•
The sunroof-ECU monitors the sunroof switch
status (slide open, slide close, tilt down, tilt up)
and the load detection sensor in the sunroof
motor and operates the sunroof motor.
TECHNICAL DESCRIPTION (COMMENT)
•
The cause may be a malfunction of the sunroof
motor power supply/ground circuit system.
TROUBLESHOOTING HINTS
•
Malfunction of the sunroof-ECU
•
Malfunction of the sunroof motor
•
Damaged harness wires or connectors
AC000629AB
Sunroof Motor Circuit
AC000623AE
CONNECTORS: D-03, D-04
D-03
D-04
SUNROOF
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BODY
42-80
DIAGNOSIS
STEP 1. Check the power supply/ground line at the
sunroof motor connector D-04.
(1) Remove the headlining. (Refer to GROUP 52A, Headlining
.)
(2) Disconnect the sunroof motor connector D-04 and measure
at the harness side.
(3) Turn the ignition key "ON".
(4) Measure the voltage between terminal 1 and ground while
the sunroof switch is depressing to the slide open/close
position. And measure the voltage between terminal 4 and
ground while the sunroof switch is depressing to the slide
open/close position.
•
Voltage should be approximately 12 volts (battery
positive voltage).
Q: Is the voltage approximately 12 volts?
YES : Go to Step 3.
NO : Go to Step 2.
STEP 2. Check the harness wires between sunroof-ECU
connector D-03 and sunroof motor connector D-04.
Q: Are there any damaged wires between sunroof-ECU
connector D-03 and sunroof motor connector D-04?
YES : Repair them, then go to Step 3.
NO : Replace the sunroof-ECU. Then go to Step 3.
STEP 3. Check the sunroof motor.
(1) Remove the sunroof motor. (Refer to
.)
(2) Check the direction of rotation of the drive gear when the
battery is connected to the connector.
Q: Is the sunroof motor damaged?
YES : Replace it, then go to Step 4.
NO : Go to Step 4.
STEP 4. Check symptoms
Q: Does the sunroof open and close normally?
YES : This diagnosis is complete.
NO : Return to Step 1.
AC000630
5 4
3 2
1
8 7 6
D-04 (HARNESS SIDE)
AB
AC000623AE
CONNECTORS: D-03, D-04
D-03
D-04
TESTER CONNECTION
DRIVE GEAR ROTATION
DIRECTION
1
−
Battery(+), 4
−
Battery(-)
LEFT
4
−
Battery(+), 1
−
Battery(-)
RIGHT
AC000631AB
DRIVE GEAR
LEFT ROTATION
RIGHT ROTATION
SUNROOF
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BODY
42-81
INSPECTION PROCEDURE 4: The sunroof motor does not stop rotating when the roof lid reaches the
fully closed/opened position.
CIRCUIT OPERATION
•
When the sunroof motor operation fully closes or
fully opens the roof lid, the sunroof-ECU uses a
limit switch signal to stop the sunroof motor.
TECHNICAL DESCRIPTION (COMMENT)
•
The cause may be a malfunction of the sunroof
motor limit switch power supply circuit system or
the ground circuit system.
TROUBLESHOOTING HINTS
•
Malfunction of the sunroof-ECU
•
Malfunction of the sunroof motor limit switch
•
Damaged harness wires or connectors
AC000632AB
Sunroof Motor Limit Switch Circuit
AC000623AE
CONNECTORS: D-03, D-04
D-03
D-04
SUNROOF
TSB Revision
BODY
42-82
DIAGNOSIS
STEP 1. Check the power supply/ground line at the
sunroof motor connector D-04.
(1) Remove the headlining. (Refer to GROUP 52A, Headlining
.)
(2) Disconnect the sunroof motor connector D-04 and measure
at the harness side.
(3) Turn the ignition key "ON".
(4) Measure the voltage between terminal 6 and ground.
•
Voltage should be approximately 12 volts (battery
positive voltage).
Q: Is the voltage approximately 12 volts?
YES : Go to Step 4.
NO : Go to Step 2.
STEP 2. Check the harness wires between sunroof-ECU
connector D-03 and sunroof motor connector D-04.
Q: Are there any damaged wires between sunroof-ECU
connector D-03 and sunroof motor connector D-04?
YES : Repair them, then go to Step 3.
NO : Replace the sunroof-ECU. Then go to Step 4.
STEP 3. Check the sunroof motor limit switch.
(1) Remove the limit switch from the sunroof motor. (Refer to
(2) Check the limit switch continuity.
Q: Is the limit switch damaged?
YES : Replace the sunroof motor. Then go to Step 4.
NO : Replace the sunroof-ECU. Then go to Step 4.
STEP 4. Check symptoms
Q: Does the sunroof open and close normally?
YES : This diagnosis is complete.
NO : Return to Step 1.
AC000633
5 4
3 2
1
8 7 6
D-04 (HARNESS SIDE)
AB
AC000623AE
CONNECTORS: D-03, D-04
D-03
D-04
SWITCH
POSITION
TESTER
CONNECTION
SPECIFIED
CONDITION
ON
6
−
8
Continuity
OFF
−
No continuity
AC000634AB
ON
OFF
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