Mitsubishi Grandis. Manual — part 308

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55-117

Step 11. Check the wiring harness between C-208
rear window defogger relay connector No.4 and
G-07 rear window defogger connector No.1.

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55-118

NOTE: Prior to the wiring harness inspection, check
junction block connector C-210 and intermediate
connector G-14, and repair if necessary.

• Check the rear window defogger relay line for

open or short circuit.

Q: Is the check result normal?

YES :

The trouble can be an intermittent

malfunction (Refer to GROUP 00, How to
Cope with Intermittent Malfunction

P.00-5

.)

NO :

Repair the wiring harness.

Step 12. Connector check: G-02 rear window
defogger connector

Q: Is the check result normal?

YES :

Go to Step 13.

NO :

Repair the connector.

AC310624

Connectors: C-208, C-210 <LHD>

AM

3

4

5

1

2

Junction block side

Junction block (Front view)

C-208

C-210

C-208

Harness side

C-210

AC310619

Connectors: C-208, C-210 <RHD>

AM

3

4

5

1

2

Junction block side

Junction block (Front view)

C-208

C-210

C-208

Harness side

C-210

AC310223

Connectors: G-07, G-14

AB

Harness side

G-07 (B)

G-07

G-14

G-14

2

1

4

3

13

8

11

10

5

7

12

6

14

9

AC310220

Connector: G-02

AB

Harness side

G-02 (B)

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55-119

Step 13. Resistance measurement at G-02 rear
window defogger connector.

(1) Disconnect the connector, and measure at the

wiring harness side.

(2) Continuity between terminal 1 and body earth.

OK: 2

Ω or less

Q: Is the check result normal?

YES :

Go to Step 15.

NO :

Go to Step 14.

Step 14. Check the wiring harness between G-02
rear window defogger connector terminal No.1
and earth.

• Check the rear window defogger earth line for

open or short circuit.

Q: Is the check result normal?

YES :

The trouble can be an intermittent

malfunction (Refer to GROUP 00, How to
Cope with Intermittent Malfunction

P.00-5

).

NO :

Repair or replace the wiring harness.

Step 15. Check the rear window defogger.

Refer to GROUP 54A, Rear Window rear window
defogger Switch Inspection

P.54A-176

.

Q: Does the rear window defogger work normally?

YES :

The trouble can be an intermittent

malfunction (Refer to GROUP 00, How to
Cope with Intermittent Malfunction

P.00-5

).

NO :

Repair the rear window defogger.

INSPECTION PROCEDURE 13: The A/C indicator flashes

CIRCUIT OPERATION

If the A/C indicator flashes then the possible causes
may be due to a defective A/C pressure system or
insufficient refrigerant gas.

TROUBLESHOOTING HINTS

• Malfunction of the A/C pressure sensor

• Malfunction of the outside thermo sensor

• Malfunction of the A/C-ECU

Step 1. MUT-III CAN bus diagnostics

Use the MUT-III to diagnose the CAN bus lines.

Q: Is the check result normal?

YES :

Go to Step 2.

NO :

Repair the CAN bus lines. (Refer to GROUP
54D

− Troubleshooting

P.54D-16

.)

Step 2. MUT-III diagnosis code

Check whether the air conditioner sets a diagnosis
code or not.

Q: Is the check result normal?

YES :

Go to Step 3.

NO :

Refer to diagnosis code chart

P.55-8

.

Step 3. MUT-III data list

Check that the following service data display
contents are normal. (Refer to

P.55-183

.)

• Item 04: Pressure sensor

Q: Is the check result normal?

YES :

Go to Step 4.

NO :

Inspection Procedure 18: Refer to A/C
pressure sensor system

P.55-142

<LHD> or

Inspection Procedure 19: Refer to A/C
pressure sensor system

P.55-144

<RHD>.

AC310220

Connector: G-02

AB

Harness side

G-02 (B)

AC310506

Connector G-02
(Harness side)

AS

AC310220

Connector: G-02

AB

Harness side

G-02 (B)

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55-120

Step 4. Check the refrigerant level.

Refer to

P.55-193

.

Q: Is the refrigerant level correct?

YES :

Go to Step 5.

NO :

Correct the refrigerant level (Refer to
On-vehicle Service

P.55-191

.)

STEP 5. Recheck the trouble symptom

Q: Is the check result normal?

YES :

Intermittent malfunction. (Refer to GROUP

00

− How to Cope with Intermittent

Malfunction

P.00-5

.)

NO :

Inspection Procedure 18: Refer to A/C
pressure sensor system

P.55-142

<LHD> or

Inspection Procedure 19: Refer to A/C
pressure sensor system

P.55-144

<RHD>.

INSPECTION PROCEDURE 14: Rear blower does not work <Vehicle with rear heater or rear cooler>

REAR
HEATER
CONTROLLER

A/C-ECU

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

Rear Heater Controller Circuit <L.H.D>