Mitsubishi 380. Manual — part 203
AUTO A/C DIAGNOSIS
HEATER, AIR CONDITIONING AND VENTILATION
55-108
STEP 5. Check A/C-ECU C-15 and C-16 for loose, corroded
or damaged terminals, or terminals pushed back in the
connector.
Q: Are A/C-ECU C-15 and C-16 in good condition?
YES : Go to Step 6.
NO : Repair or replace the connector. Refer to GROUP
00E, Harness Connector Inspection
. Check
that the air conditioning works normally.
AC305206
CONNECTOR: A-30
AY
HARNESS SIDE
A-30 (B)
25DB070A
CONNECTORS: C-15, C-16
C-16 (B)
HARNESS SIDE
C-16
C-15
C-15 (B)
HARNESS SIDE
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
AUTO A/C DIAGNOSIS
HEATER, AIR CONDITIONING AND VENTILATION
55-109
STEP 6. Check the wiring harness between A/C-ECU
connector C-15 (terminal 12), C-16 (terminals 34 and 26)
and A/C pressure sensor connector A-30 (terminals 3, 1
and 2).
Q: Is the wiring harness between A/C-ECU connector C-15
(terminal 12), C-16 (terminals 34 and 26) and A/C
pressure sensor connector A-30 (terminals 3, 1 and 2) in
good condition?
YES : Repair the A/C-ECU. Check that the air conditioning
works normally.
NO : Repair the wiring harness. Check that the air
conditioning works normally.
STEP 7. Check the refrigerant level.
Use the refrigerant recovery station to remove all of the refrig-
erant, and then calculate the amount of the refrigerant and
charge it.
Q: Is the refrigerant level correct?
YES : Replace the A/C-ECU.Check that the air conditioning
works normally.
NO : Correct the refrigerant level (Refer to On-vehicle
). Check that the air conditioning
works normally.
AC305206
CONNECTOR: A-30
AY
HARNESS SIDE
A-30 (B)
25DB070A
CONNECTORS: C-15, C-16
C-16 (B)
HARNESS SIDE
C-16
C-15
C-15 (B)
HARNESS SIDE
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
AUTO A/C DIAGNOSIS
HEATER, AIR CONDITIONING AND VENTILATION
55-110
INSPECTION PROCEDURE 8: Defogger Function Does Not Operate.
.
TECHNICAL DESCRIPTION (COMMENT)
If the defogger does not operate when the defogger
switch is turned on, the defogger relay system may
be defective.
.
TROUBLESHOOTING HINTS
• Malfunction of the A/C-ECU
• Malfunction of the defogger relay
• Damaged harness wires or connectors
• Refer to component locations GROUP-
• Refer to configuration diagrams GROUP-
• Refer to circuit diagrams GROUP-
DIAGNOSIS
Required Special Tool:
• MB991223: Test Harness Set
STEP 1. Check the A/C and outside/inside air selection
damper control motor operation.
Q: Do the A/C and outside/inside air selection damper
control motor work normally?
YES : Go to Step 2.
NO : Refer to Inspection procedure 10, "Malfunction of the
A/C-ECU power supply system
25DB122A
C-15 (B)
CONNECTOR: C-15
25DB123A
JUNCTION BLOCK
(FRONT VIEW)
C-204
C-211
C-215
C-201
C-216 (B)
CONNECTORS: C-201, C-204, C-211
C-215, C-216
25DB150A
CONNECTOR: C-31
25DB152A
CONNECTORS: D-11
D-11
AUTO A/C DIAGNOSIS
HEATER, AIR CONDITIONING AND VENTILATION
55-111
STEP 2. Check defogger relay connector C-201 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is defogger relay connector C-201 in good condition?
YES : Go to Step 3.
NO : Repair or replace the connector. Refer to GROUP
00E, Harness Connector Inspection
. The
defogger system should work normally.
STEP 3. Check the defogger relay continuity.
Follow the table below to check the defogger relay for continu-
ity.
Q: Is the defogger relay in good condition?
YES : Go to Step 4.
NO : Replace the defogger relay. The defogger system
should work normally.
25DB125A
CONNECTOR: C-201
JUNCTION BLOCK SIDE
JUNCTION BLOCK
(FRONT VIEW)
BATTERY VOLTAGE
CONNECT
TESTER
BETWEEN
SPECIFIED
CONDITION
Not applied
4
− 5
Open Circuit
• Connect terminal 1
to the positive
battery terminal
• Connect terminal 3
to the negative
battery terminal
4
− 5
Less than 2 ohms
25DB126A
4
5
1 2 3
5
1
4
3
DEFOGGER RELAY
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