Mitsubishi L200. Manual - part 539

SUNROOF ASSEMBLY

BODY

42-216

SYMPTOM PROCEDURES

Inspection Procedure 1: The Sunroof does not Work at All.

CAUTION

Whenever the ECU is replaced, ensure that the 
input and output signal circuits are normal.

AC806121

Sunroof-ECU Power Supply Circuit

HALL IC

HALL IC

ECU

MOTOR

SUNROOF
MOTOR 
ASSEMBLY

SUNROOF
SWITCH

IGNITION 
SWITCH (IG2)

20

FUSIBLE
LINK

Wire colour code
B : Black     LG : Light green     G : Green     L : Blue     W : White     Y : Yellow     SB : Sky blue
BR : Brown     O : Orange     GR : Grey     R : Red     P : Pink     V : Violet     PU : Purple

AC

C-207

SUNROOF ASSEMBLY

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COMMENTS ON TROUBLE SYMPTOM
If the sunroof does not work at all, these power sup-
ply circuit(s), these earth circuit(s), sunroof switch or 
the sunroof motor assembly (sunroof-ECU) may be 
defective.

PROBABLE CAUSES

• Malfunction of the sunroof switch

• Malfunction of the sunroof motor assembly (sun-

roof-ECU)

• Damaged harness wires and connectors

SUNROOF ASSEMBLY

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DIAGNOSIS PROCEDURE

STEP 1. Connector check: D-29 sunroof switch 
connector

AC903885AI

Connector: D-28, D-29 <LHD>

Harness side

D-29 (B)

D-29 (B)

D-28

D-28

Harness side

AC903886AG

Connector: D-28, D-29 <RHD>

Harness side

D-29 (B)

D-29 (B)

D-28

D-28

Harness side

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Repair the connector.

STEP 2. Check the sunroof switch.
Check that the sunroof switch works normally. Refer 
to 

P.42-230

.

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Replace the sunroof switch.

STEP 3. Resistance measurement at the D-29 
sunroof switch connector.

AC903885AI

Connector: D-28, D-29 <LHD>

Harness side

D-29 (B)

D-29 (B)

D-28

D-28

Harness side

AC903886AG

Connector: D-28, D-29 <RHD>

Harness side

D-29 (B)

D-29 (B)

D-28

D-28

Harness side

(1) Disconnect the connector, and measure at the 

wiring harness side.

AC209731

6

4

5

3 2 1

Connector D-29 
(Harness side)

AC208731BF

(2) Check the resistance between D-29 sunroof 

switch connector terminal No.4 and body earth

OK: Continuity exists (2 

Ω or less)

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Go to Step 4.

SUNROOF ASSEMBLY

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STEP 4. Check the wiring harness between D-29 
sunroof switch connector terminal No.4 and 
body earth.

AC903885AI

Connector: D-28, D-29 <LHD>

Harness side

D-29 (B)

D-29 (B)

D-28

D-28

Harness side

AC903886AG

Connector: D-28, D-29 <RHD>

Harness side

D-29 (B)

D-29 (B)

D-28

D-28

Harness side

• Check the earth wires for open circuit.

Q: Is the check result 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 : 

Repair the wiring harness.

STEP 5. Connector check: D-28 sunroof motor 
assembly connector

AC903885AI

Connector: D-28, D-29 <LHD>

Harness side

D-29 (B)

D-29 (B)

D-28

D-28

Harness side

AC903886AG

Connector: D-28, D-29 <RHD>

Harness side

D-29 (B)

D-29 (B)

D-28

D-28

Harness side

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Repair the connector.

STEP 6. Voltage measurement at the D-28 
sunroof motor assembly connector.

AC903885AI

Connector: D-28, D-29 <LHD>

Harness side

D-29 (B)

D-29 (B)

D-28

D-28

Harness side

AC903886AG

Connector: D-28, D-29 <RHD>

Harness side

D-29 (B)

D-29 (B)

D-28

D-28

Harness side

(1) Disconnect the sunroof motor assembly 

connector, and measure at the harness side.