Mitsubishi Montero (2004+). Manual — part 647
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-77
STEP 21. Check blower motor connector D-113 and heater
blower controller unit connector D-17 for damage.
Q: Is blower motor connector D-113 and heater blower
controller unit D-17 in good condition?
YES : Go to Step 22.
NO : Repair or replace the connector. Refer to GROUP
00E, Harness Connector Inspection
blower motor should operate normally.
STEP 22. Check the wiring harness between blower motor
connector D-113 (terminal 2) and heater blower controller
unit connector D-17 (terminal 1).
Q: Is the wiring harness between blower motor connector
D-113 (terminal 2) and heater blower controller unit
connector D-17 (terminal 1) in good condition?
YES : Go to Step 23.
NO : Repair the wiring harness. The blower motor should
operate normally.
AC204189
CONNECTORS : D-17, D-113
D-17
HARNESS SIDE
HARNESS SIDE
D-113
AC
D-113
D-17
1
2
3
4
1
2
AC204189
CONNECTORS : D-17, D-113
D-17
HARNESS SIDE
HARNESS SIDE
D-113
AC
D-113
D-17
1
2
3
4
1
2
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-78
STEP 23. Check A/C-ECU connector D-23 and heater
blower controller unit connector D-17 for damage.
Q: Is A/C-ECU connector D-23 and heater blower controller
unit D-17 in good condition?
YES : Go to Step 24.
NO : Repair or replace the connector. Refer to GROUP
00E, Harness Connector Inspection
blower motor should operate normally.
STEP 24. Check the wiring harness between A/C-ECU
connector D-23 (terminal 10) and heater blower controller
unit connector D-17 (terminal 3).
Q: Is the wiring harness between A/C-ECU connector D-23
(terminal 10) and heater blower controller unit
connector D-17 (terminal 3) in good condition?
YES : Go to Step 25.
NO : Repair the wiring harness. The blower motor should
operate normally.
AC204171
CONNECTOR : D-17
AP
1
2
3
4
HARNESS
SIDE
AC204170
CONNECTOR : D-23
D-23(B)
D-23(B)
CP
HARNESS
SIDE
1
3
4
2
12
1413
11
6
7
8
10 9
18
19
20
16
17
5
15
AC204171
CONNECTOR : D-17
AP
1
2
3
4
HARNESS
SIDE
AC204170
CONNECTOR : D-23
D-23(B)
D-23(B)
CP
HARNESS
SIDE
1
3
4
2
12
1413
11
6
7
8
10 9
18
19
20
16
17
5
15
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-79
STEP 25. Replace the heater blower controller unit.
Q: Do the blower motor work normally?
YES : The procedure is complete.
NO : Go to Step 26.
STEP 26. Check the flexible flat cable (FFC).
(1) The FCC is connected to the automatic air conditioning
control panel assembly. Check that the FCC connection is
contaminated with foreign material or loose (Refer to
(2) There should be continuity across the FFC terminals.
Q: Is the FFC normal?
YES : Go to Step 27.
NO : Repair the FFC (Refer to
). The blower
motor should operate normally.
STEP 27. Check the blower switch.
Follow the table below to check the blower switch for continuity.
Q: Is the check result normal?
YES : Replace the A/C-ECU. The blower motor should
operate normally.
NO : Replace the automatic air-conditioning control panel.
The blower motor should operate normally.
AC205264AB
SWITCH
POSITION
TESTER CONNECTION SPECIFIED
CONDITION
OFF
9
− 10
Less than 2 ohms
AUTO
8
− 9, 9 − 10
Less than 2 ohms
1
8
− 9
Less than 2 ohms
2
6
− 9, 8 − 9
Less than 2 ohms
3
6
− 9, 8 − 9, 9 − 10
Less than 2 ohms
4
6
− 9, 9 − 10
Less than 2 ohms
5
6
− 9
Open circuit
6
4
− 9, 6 − 9
Less than 2 ohms
7
4
− 9, 6 − 9, 9 − 10
Less than 2 ohms
8
4
− 9, 6 − 9, 8 − 9, 9 − 10 Less than 2 ohms
AC205403
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
AC
AC205260
OFF
AUTO
8
7
6
5
4
3
2
1
AB
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-80
INSPECTION PROCEDURE 5: Blower Air Amount cannot be Changed.
.
TECHNICAL DESCRIPTION (COMMENT)
If the blower air amount can not be changed when
the blower switch is operated, the heater blower con-
troller unit may be defective.
.
TROUBLESHOOTING HINTS
• Malfunction of the heater blower controller unit
• Malfunction of the flexible flat cable
• Malfunction of the blower motor
• Malfunction of the automatic air-conditioning con-
trol panel
• Damaged harness wires or connectors
DIAGNOSIS
Required Special Tools:
• MB991223: Harness Set
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: MUT-III USB Cable
• MB991911: MUT-III Main Harness B (Vehicles without
CAN communication system)
Blower Motor Circuit
AC204171 AZ
CONNECTOR : D-17
AC204170
CONNECTOR : D-23
DQ
D-23(B)
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