Mitsubishi 380. Manual — part 196

AUTO A/C DIAGNOSIS

HEATER, AIR CONDITIONING AND VENTILATION

55-80

STEP 9. Measure the voltage at A/C compressor clutch
relay connector B-18X.

CAUTION

The top and bottom of the A/C compressor connector are
difficult to identify. Prior to inspection, confirm the triangle
mark on the relay box.
(1) Disconnect A/C compressor connector B-18X and measure

the voltage at the relay box side.

(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal 2 and ground.

• The measured value should be approximately 12 volts

(battery positive voltage).

Q: Is the measured voltage approx. 12 volts?

YES : Go to Step 11.
NO : Go to Step 10.

STEP 10. Check the wiring harness between A/C
compressor clutch relay connector B-18X (terminal 2) and
the ignition switch (IG2).

AC305977AJ

CONNECTOR: B-18X

RELAY BOX SIDE

FRONT OF
VEHICLE

JUNCTION BLOCK

TRIANGLE MARK

AC209365GT

CONNECTOR B-18X
(RELAY BOX SIDE)

AC305977AJ

CONNECTOR: B-18X

RELAY BOX SIDE

FRONT OF
VEHICLE

JUNCTION BLOCK

TRIANGLE MARK

AUTO A/C DIAGNOSIS

HEATER, AIR CONDITIONING AND VENTILATION

55-81

NOTE: Also check intermediate connector A-13, junction block
connectors C-214 and C-215 for loose, corroded, or damaged
terminals, or terminals pushed back in the connector. If inter-
mediate connector A-13, junction block connector C-214 or
C-215 is damaged, repair or replace the connector as
described in GROUP 00E, Harness Connector Inspection

P.00E-2

.

Q: Is the wiring harness between A/C compressor clutch

relay connector B-18X (terminal 2) and the ignition
switch (IG2) in good condition?
YES : It can be assumed that this malfunction is intermittent.

Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points

− How to

Cope with Intermittent Malfunctions

P.00-14

.

NO : Repair the wiring harness. Check that the air

conditioning works normally.

AC305210

A-13 (GR)

AR

CONNECTOR: A-13

25DB103A

CONNECTORS: C-214, C-215

JUNCTION BLOCK

(FRONT VIEW)

C-215

HARNESS SIDE

C-214

C-214

HARNESS SIDE

C-215

10

1

6

14

5

12

13

4

11

7

2

3

8

9

AUTO A/C DIAGNOSIS

HEATER, AIR CONDITIONING AND VENTILATION

55-82

STEP 11. Measure the voltage at A/C compressor clutch
relay connector B-18X.

CAUTION

The top and bottom of the A/C compressor connector are
difficult to identify. Prior to inspection, confirm the triangle
mark on the relay box.
(1) Disconnect A/C compressor connector B-18X and measure

the voltage at the wiring harness side.

(2) Measure the voltage between terminal 1 and ground.

• The measured value should be approximately 12 volts

(battery positive voltage).

Q: Is the measured voltage approx. 12 volts?

YES : Go to Step 13.
NO : Go to Step 12.

STEP 12. Check the wiring harness between A/C
compressor clutch relay connector B-18X (terminal 1) and
the battery.

AC305977AJ

CONNECTOR: B-18X

RELAY BOX SIDE

FRONT OF
VEHICLE

JUNCTION BLOCK

TRIANGLE MARK

AC209365GU

CONNECTOR B-18X
(RELAY BOX SIDE)

AC305977AJ

CONNECTOR: B-18X

RELAY BOX SIDE

FRONT OF
VEHICLE

JUNCTION BLOCK

TRIANGLE MARK

AUTO A/C DIAGNOSIS

HEATER, AIR CONDITIONING AND VENTILATION

55-83

NOTE: Also check intermediate connector A-13 for loose, cor-
roded, or damaged terminals, or terminals pushed back in the
connector. If intermediate connector A-13 is damaged, repair or
replace the connector as described in GROUP 00E, Harness
Connector Inspection

P.00E-2

.

Q: Is the wiring harness between A/C compressor clutch

relay connector B-18X (terminal 1) and the battery in
good condition?
YES : It can be assumed that this malfunction is intermittent.

Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points

− How to

Cope with Intermittent Malfunctions

P.00-14

.

NO : Repair the wiring harness. Check that the air

conditioning works normally.

STEP 13. Check the wiring harness between A/C
compressor clutch relay connector B-18X (terminal 4) and
A/C compressor assembly connector B-28 (terminal 1).
Q: Is the wiring harness between A/C compressor clutch

relay connector B-18X (terminal 4) and A/C compressor
connector B-28 (terminal 1) in good condition?
YES : Go to Step 14.
NO : Repair the wiring harness. Check that the air

conditioning works normally.

AC305210

A-13 (GR)

AR

CONNECTOR: A-13

AC305977AJ

CONNECTOR: B-18X

RELAY BOX SIDE

FRONT OF
VEHICLE

JUNCTION BLOCK

TRIANGLE MARK

AC305218

B-28 (B)

HARNESS SIDE

AB

CONNECTOR: B-28 <3.8 L>