Mitsubishi Galant. Manual — part 573

SUNROOF

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42-75

CIRCUIT OPERATION

•

The sunroof-ECU power is supplied from ignition
switch (IG2).

TECHNICAL DESCRIPTION (COMMENT)

•

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

TROUBLESHOOTING HINTS

•

Malfunction of the sunroof-ECU

•

Damaged harness wires or connectors

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) 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 3.
NO : Go to Step 2.

STEP 2. Check the harness wires between ignition switch
(IG2) and the sunroof-ECU connector D-03.
(1) Remove the column cover.
(2) Check the harness wires between ignition switch (IG2) and

sunroof-ECU connector D-03.

Q: Are there any damaged wires between ignition switch

(IG2) and sunroof-ECU connector D-03?
YES : Repair them, then go to Step 3.
NO : Go to Step 4.

AC000624

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

SUNROOF

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42-76

NOTE: After inspecting intermediate connector C-27, C-73 or
C-77 inspect the wire. If intermediate connector C-27, C-73 or
C-77 are damaged, repair or replace them. Refer to GROUP
00E

P.00E-2

, Harness Connector Inspection. Then go to Step

3.

STEP 3. Check the harness wire between sunroof-ECU
connector D-03 and ground.
Q: Is the harness wire between sunroof-ECU connector D-

03 and ground damaged?
YES : Repair it, then go to Step 4.
NO : Replace the sunroof-ECU. Then go to Step 4.

NOTE: After inspecting intermediate connector C-73 inspect
the wire. If intermediate connector C-73 are damaged, repair or
replace them. Refer to GROUP 00E

P.00E-2

, Harness

Connector Inspection. 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.

AC000621AB

CONNECTOR: C-27

AC003082AK

CONNECTORS: C-73, C-77

C-73

JUNCTION BLOCK
(FRONT VIEW)

C-77

AC000623AB

CONNECTOR: D-03

AC003082AD

JUNCTION BLOCK
(FRONT VIEW)

CONNECTOR: C-73

SUNROOF

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BODY

42-77

INSPECTION PROCEDURE 2: The sunroof does not operate when the sunroof switch is operated.

CIRCUIT OPERATION

•

The sunroof-ECU monitors the sunroof switch
status (slide open, slide closed, tilt down, tilt up)
and operates the sunroof motor.

TECHNICAL DESCRIPTION (COMMENT)

•

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

TROUBLESHOOTING HINTS

•

Malfunction of the sunroof-ECU

•

Malfunction of the sunroof switch

•

Damaged harness wires or connectors

AC000627AB

Sunroof Switch Circuit

AC000623AC

D-03

D-02

CONNECTORS: D-02, D-03

SUNROOF

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42-78

DIAGNOSIS

STEP 1. Check the power supply line at the sunroof switch
connector D-02.
(1) Remove the headlining. (Refer to GROUP 52A, Headlining

P.52A-14

.)

(2) Disconnect the sunroof switch connector D-02 and measure

at the harness side.

(3) Turn the ignition key "ON".
(4) Measure the voltage between terminal 3 and ground,

between terminal 5 and ground, and 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 3.
NO : Go to Step 2.

STEP 2. Check the harness wires between sunroof switch
connector D-02 and sunroof-ECU connector D-03.
Q: Are there any damaged wires between sunroof switch

connector D-02 and sunroof-ECU connector D-03?
YES : Repair them, then go to Step 3.
NO : Replace the sunroof-ECU. Then go to Step 3.

STEP 3. Check the harness wire between sunroof switch
connector D-02 and ground.
Q: Is the harness wire between sunroof switch connector

D-02 and ground damaged?
YES : Repair it, then go to Step 4.
NO : Replace the sunroof switch. 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.

AC000628

1

2

3

4

5

6

D-02 (HARNESS SIDE)

AB

AC000623AC

D-03

D-02

CONNECTORS: D-02, D-03

AC000623AD

CONNECTOR: D-02