Mitsubishi Galant (2004+). Manual — part 773
MANUAL A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55A-231
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).
NOTE: Also check intermediate connector C-29 for loose, cor-
roded, or damaged terminals, or terminals pushed back in the
connector. If intermediate connector C-29 is damaged, repair or
replace the connector as described in GROUP 00E, Harness
Connector Inspection
.
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.
AC305206
CONNECTOR: A-30
AY
HARNESS SIDE
A-30 (B)
AC305234
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
AG
AC305231AI
CONNECTOR: C-29
MANUAL A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55A-232
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
Service
). Check that the air conditioning
works normally.
MANUAL A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55A-233
INSPECTION PROCEDURE 8: Defogger Function Does Not Operate.
IGNITION
SWITCH (IG2)
1
FUSIBLE
LINK
DEFOGGER
RELAY
CHOKE
COIL
JUNCTION
BLOCK
DEFOGGER
A/C-
ECU
Defogger Circuit
MANUAL A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55A-234
.
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
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
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.
AC305233
C-15 (B)
BI
CONNECTOR: C-15
AC305415
JUNCTION BLOCK
(FRONT VIEW)
C-204
C-211
C-215
C-201
C-216 (B)
BF
CONNECTORS: C-201, C-204, C-211
C-215, C-216
AC305231CH
CONNECTOR: C-29
AC305268
CONNECTORS: D-08, D-11, D-13, D-14
D-08
D-11
D-13
D-14
AO
AC305415BE
CONNECTOR: C-201
JUNCTION BLOCK SIDE
JUNCTION BLOCK
(FRONT VIEW)
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