Mitsubishi L200. Manual — part 881
TROUBLESHOOTING
AUTOMATIC AIR CONDITIONER
55B-53
STEP 8. Check the wiring harness between A-21X
A/C compressor relay connector terminal No.4
and the fusible link (20).
AC510163
AE
Connector: A-21X
Relay box side
AC509975AW
Harness side
Connector: A-115
NOTE: Prior to the wiring harness inspection, check
intermediate connector A-115 repair if necessary.
• Check the A/C compressor relay power supply
line for open 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 ).
NO :
Repair the wiring harness.
STEP 9. Check the wiring harness between A-21X
A/C compressor relay connector terminal No.3
and A-33 A/C compressor connector terminal
No.1.
AC510163
AE
Connector: A-21X
Relay box side
AC509975AV
A-33 Harness side
Connectors: A-27, A-28, A-33
A-33 (B)
A-28 (B)
A-28
A-27 (B)
A-27
NOTE: Prior to the wiring harness inspection, check
intermediate connector A-28 and A-27, and repair if
necessary.
• Check the A/C compressor relay power supply
line for open circuit.
Q: Is the check result normal?
YES :
Go to Step 10.
NO :
Repair the wiring harness.
TROUBLESHOOTING
AUTOMATIC AIR CONDITIONER
55B-54
STEP 10. Check the wiring harness between A-
21X A/C compressor relay connector terminal
No.2 and C-105 engine-ECU connector terminal
No.40.
AC510163
AE
Connector: A-21X
Relay box side
AC509613 CD
Harness side
C-105 (B)
Connector: C-105 <LHD>
35
40
41
42
1817
38
39
15
16
14
3736
12
13
11
32
8
3433
9
10
30
31
7 6
29
5
4
28
3
27
2
26
1
25
19
43
2120
22
23
46
47
4544
24
48
76
52
86
62
63
64
65
66
67
68
69
70
71
72
92
95
96
93
94
89
90
91
8887
53
54
55
56
57
58
59
60
61
83
8584
8281
78
79
80
77
49
50
51
74
75
73
AC509930 CA
C-105 (B)
Connector: C-105 <RHD>
Harness side
35
40
41
42
1817
38
39
15
16
14
3736
12
13
11
32
8
3433
9
10
30
31
7 6
29
5
4
28
3
27
2
26
1
25
19
43
2120
22
23
46
47
4544
24
48
76
52
86
62
63
64
65
66
67
68
69
70
71
72
92
95
96
93
94
89
90
91
8887
53
54
55
56
57
58
59
60
61
83
8584
8281
78
79
80
77
49
50
51
74
75
73
• Check the A/C compressor power supply line for
open 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 ).
NO :
Repair the wiring harness.
STEP 11. Check the magnetic clutch operation.
Refer to .
Q: Can the sound of the magnetic clutch (click) be
heard?
YES :
Go to Step 12.
NO :
Replace the compressor magnet clutch.
STEP 12. Check the refrigerant level.
Refer to .
Q: Is the refrigerant level correct?
YES :
Go to Step 13.
NO :
Correct the refrigerant level (Refer to ).
STEP 13. Replace the A/C-ECU, and then recheck
the trouble symptom
Check that the compressor works normally.
Q: Is the check result normal?
YES :
This diagnosis is complete.
NO :
Replace the engine-ECU.
TROUBLESHOOTING
AUTOMATIC AIR CONDITIONER
55B-55
Inspection Procedure 6: The rear window defogger does not work <Vehicles without rear panel power
window>
Rear Window Defogger Circuit
REAR WINDOW
DEFOGGER RELAY
REAR WINDOW
DEFOGGER SWITCH
REAR WINDOW
DEFOGGER
A/C-SWITCH
MODULE
FUSIBLE
LINK
IGNITION
SWITCH (IG2)
20
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
AC900630
COMMENTS ON TROUBLE SYMPTOM
If the rear window defogger does not operate when
the rear window defogger switch is turned on, the
rear window defogger relay system may be defec-
tive.
PROBABLE CAUSES
• Malfunction of the automatic A/C control panel (A/
C-ECU)
• Malfunction of the rear window defogger relay
• Damaged the wiring harness or connectors
• Malfunction of the rear window defogger
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