Mitsubishi Montero (2002-2004). Manual — part 102
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-101
STEP 13. Check the wiring harness between defogger
relay connector D-216 (terminal 3) and A/C-ECU connector
D-23 (terminal 15).
NOTE: Also check junction block connector D-209. If junction
block connector D-209 is damaged, repair or replace the con-
nector as described in GROUP 00E, Harness Connector
Inspection
.
Q: Is the wiring harness between defogger relay connector
D-216 (terminal 3) and A/C-ECU connector D-23
(terminal 15) in good condition?
YES : Go to Step 18.
NO : Repair or replace the wiring harness. Refer to
GROUP 00E, Harness Connector Inspection
. Check that the defogger system works normally.
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
AC204191
JUNCTION BLOCK
(FRONT VIEW)
CONNECTORS : D-209, D-216
D-209
HARNESS SIDE
D-216
RELAY SIDE
AX
D-209
D-216
1
2
5
4
3
1
2
6
7
9
3
4
11
12
10
5
13
8
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-102
STEP 14. Measure at defogger connector I-01 to check the
ground circuit to the defogger connector.
(1) Disconnect defogger connector I-01, and measure at the
wiring harness side.
(2) Measure the resistance value between terminal 1 and
ground.
• 2 ohms or less
Q: Does the measured resistance value correspond with
this range?
YES : Go to Step 17.
NO : Go to Step 15.
STEP 15. Check defogger connector I-01 for damage.
Q: Is defogger connector I-01 in good condition?
YES : Go to Step 16.
NO : Repair or replace the connector. Refer to GROUP
00E, Harness Connector Inspection
that the defogger system works normally.
STEP 16. Check the wiring harness between defogger
connector I-01 (terminal 1) and ground.
Q: Is the wiring harness between defogger connector I-01
(terminal 1) and ground in good condition?
YES : Check that the defogger system works normally.
NO : Repair or replace the wiring harness. Refer to
GROUP 00E, Harness Connector Inspection
. Check that the defogger system works normally.
AC204182
CONNECTOR : I-01
AJ
I-01(B)
I-01(B)
1
HARNESS
SIDE
AC201095
1
AC
HARNESS SIDE : I-01
AC204182
CONNECTOR : I-01
AJ
I-01(B)
I-01(B)
1
HARNESS
SIDE
AC204182
CONNECTOR : I-01
AJ
I-01(B)
I-01(B)
1
HARNESS
SIDE
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-103
STEP 17. Check the defogger.
1.Run engine at 2,000 r/min. Check heater element with battery
at full.
2.Turn "ON "rear window defogger switch. Measure heater ele-
ment voltage with circuit tester at rear window glass center A.
Condition is good if it indicates about six volts.
3.If 12 volts is indicated at A, there is a break in the negative
terminals from A. Move test bar slowly to negative terminal to
detect where voltage changes suddenly (0 volt).
4.If 0 volt is indicated at A, there is a break in the positive termi-
nals from A. Defect where the voltage changes suddenly (12
volts, battery positive voltage) in the same method described
above.
Q: Does the defogger work normally?
YES : Check that the defogger system works normally.
NO : Replace the back door glass. Refer to GROUP 42,
Window glass
− Back door window glass
.
STEP 18. 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 19.
NO : Repair the FFC. (Refer to
.) Check that the
defogger system works normally.
ACX00813
NORMAL CHARACTERSTIC CURVE
ABNORMAL CHARACTERSTIC CURVE
VOLTAGE
A (CENTER POINT)
APPROXIMATELY
6 V
NEGATIVE
TERMINAL
PRINTED
HEATER
LINE
POSITIVE
TERMINAL
NEGATIVE
TERMINAL
PRINTED
HEATER
LINE
POSITIVE
TERMINAL
OPENCIRCUIT
POINT
VOLTAGE
AC
AC205264AB
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-104
STEP 19. Check the rear window defogger switch.
There should be continuity between terminals 6 and 13 while
the rear window defogger switch is pushed.
Q: Is the check result normal?
YES : Replace the A/C-ECU. Check that the defogger
system works normally.
NO : Replace the automatic air-conditioning control panel.
Check that the defogger system works normally.
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
AE
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