Mitsubishi Galant. Manual — part 575

SUNROOF

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42-83

INSPECTION PROCEDURE 5: The motor does not stop after overload condition.

•

The sunroof motor does not stop even the roof lid
motion is hampered (by obstruction, etc.) during
tilt up operation.

•

The sunroof motor does not reverse operation
even when the roof lid motion is hampered (by
obstruction, etc.) during tilt down operation, and
does not return to the tilt up completed state.

•

The sunroof motor does not stop even when the
roof lid motion is hampered (by obstruction, etc.)
during slide open operation.

•

The sunroof motor does not stop after reverse
operation even when the roof lid motion is
hampered (by obstruction, etc.) during slide
closed operation.

CIRCUIT OPERATION

•

The sunroof-ECU monitors the load conditions
from the amount of current flowing to the motor. If
more than the standard amount of current is
flowing, the direction of motor operation is
reversed to prevent jamming.

TECHNICAL DESCRIPTION (COMMENT)

•

The cause may be a malfunction of the sunroof
motor sensor power supply circuit system or the
ground circuit system.

TROUBLESHOOTING HINTS

•

Malfunction of the sunroof-ECU

•

Malfunction of the sunroof motor sensor

•

Damaged harness wires or connectors

AC000635AB

Sunroof Motor Overload Sensor Circuit

AC000623AE

CONNECTORS: D-03, D-04

D-03

D-04

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DIAGNOSIS

STEP 1. Check the harness wires between sunroof-ECU
connector D-03 and sunroof motor connector D-04.
(1) Remove the headlining. (Refer to GROUP 52A, Headlining

P.52A-14

.)

(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 2.
NO : Go to Step 2.

STEP 2. Check the sunroof-ECU terminal voltage.
(1) Remove the sunroof-ECU from the sunroof motor. (Refer to

P.42-92

.)

(2) Check the sunroof-ECU terminal voltage.

Q: Is the sunroof -ECU terminal voltage normal?

YES : Replace the sunroof-ECU. Then go to Step 3.
NO : Replace the sunroof motor. Then go to Step 3.

STEP 3. Check symptoms

Q: Are the harness wires, sunroof-ECU and sunroof motor

sensor normal?
YES : This diagnosis is complete.
NO : Return to Step 1.

AC000623AE

CONNECTORS: D-03, D-04

D-03

D-04

TERMINAL
NO.

CHECK
ITEM

CHECK
CONDITION

NORMAL
CONDITION

1Sensor

power supply

Ignition
switch: ON

Battery
positive
voltage

2

Sensor 1When motor

is operating

Battery
positive
voltage
(pulse)

9

Sensor earth Always

0V

10

Sensor 2

When motor
is operating

Battery
positive
voltage
(pulse)

5

4

6

13

3

2

1

14

12

11

10

9

8

7

15 16 1718

AC004249

Sunroof-ECU Connector Terminal

Arrangement

AB

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INSPECTION PROCEDURE 6: Safety mechanism does not function.

CIRCUIT OPERATION

•

The power for the safety mechanism circuit in the
sunroof-ECU is supplied from fusible link number
3.

TECHNICAL DESCRIPTION (COMMENT)

•

The cause may be a malfunction of the sunroof-
ECU power supply for safety mechanism circuit
system or of the ground circuit system.

TROUBLESHOOTING HINTS

•

Malfunction of the sunroof-ECU

•

Damaged harness wires or connectors

AC000636AB

Sunroof-ECU Power Supply for 30 seconds timer Circuit and Ground Circuit

AC000637AB

C-66

C-27

CONNECTOR

BLOCK (LH)

CONNECTORS: C-27, C-66

AC000623AB

CONNECTOR: D-03

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DIAGNOSIS

STEP 1. Check the power supply line at the sunroof-ECU
connector D-03.
(1) Remove the headlining. (Refer to GROUP 52A, Headlining

P.52A-14

.)

(2) Disconnect the sunroof-ECU connector D-03 and measure

at the harness side.

(3) Measure the voltage between terminal 7 and ground.

•

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 fusible link
number 3 and sunroof-ECU connector D-03.
Q: Are there any damaged wires between fusible link

number 3 and sunroof-ECU connector D-03?
YES : Repair them, then go to Step 3.
NO : Go to Step 4.

NOTE: After inspecting intermediate connectors C-27 and C-
66, inspect the wire. If intermediate connectors C-27 or C-66
are damaged, repair or replace them. Refer to GROUP 00E

P.00E-2

, Harness Connector Inspection. Then go to Step 3.

AC000638

5

4

6

13

3 2 1

14

12 1110 9

8 7

15

16

17

18

D-03 (HARNESS SIDE)

AB

AC000623AB

CONNECTOR: D-03

AC000637AB

C-66

C-27

CONNECTOR

BLOCK (LH)

CONNECTORS: C-27, C-66