Mitsubishi Montero (2002-2004). Manual — part 92
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-61
.
TECHNICAL DESCRIPTION (COMMENT)
If the blower fan and motor does not turn when the
blower switch is operated, the blower motor circuit
may be defective.
.
TROUBLESHOOTING HINTS
• Malfunction of the blower relay
• 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
STEP 1. Using scan tool MB991502, check actuator test
item 01, item 02, item 03 and item 04: Blower motor.
Carry out the actuator test.
Item 01, 02, 03 and 04: Blower motor
Q: Do the check results show "Stop" (01 activated), "low
speed" (02 activated), "medium speed" (03 activated),
and "high speed" (04 activated)?
YES : Go to Step 25.
NO : Go to Step 2.
AC204171 BC
D-17 D-113
CONNECTORS : D-17, D-113
AC204170
CONNECTORS : D-23, D-28
DW
D-28
D-23(B)
AC204173
CONNECTORS : D-208, D-209, D-211, D-218
BH
D-208
D-218
D-209
D-211(B)
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-62
STEP 2. Measure the voltage at blower motor connector D-
113.
(1) Disconnect blower motor connector D-113, and measure
the voltage at the harness side.
(2) Turn the ignition switch to the "ON" position.
(3) Turn the blower switch to the "ON" position.
(4) Measure the voltage between terminal 1 and ground.
• The measured value should be approximately 12 volts
(battery positive voltage).
Q: Does the measured voltage correspond with this range?
YES : Go to Step 14.
NO : Go to Step 3.
STEP 3. Check the front blower relay continuity.
Follow the table below to check the front blower relay for conti-
nuity.
Q: Is the front blower relay continuity in good condition?
YES : Go to Step 4.
NO : Replace the front blower relay. The blower motor
should operate normally.
AC204171
CONNECTOR : D-113
AR
HARNESS
SIDE
1
2
AC204738 DB
HARNESS SIDE : D-113
1
2
BATTERY VOLTAGE
TESTER
CONNECTION
SPECIFIED
CONDITION
Not applied
2
− 5
Open circuit
• Connect terminal 3
to the positive
battery terminal
• Connect terminal 1
to the negative
battery terminal
2
− 5
Less than 2 ohms
AC204714AB
FRONT BLOWER RELAY
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-63
STEP 4. Measure the voltage at front blower relay
connector D-218.
(1) Disconnect front blower relay connector D-218, and
measure the voltage at the junction block side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 3 and ground.
• The measured value should be approximately 12 volts
(battery positive voltage).
Q: Does the measured voltage correspond with this range?
YES : Go to Step 7.
NO : Go to Step 5.
STEP 5. Check front blower relay connector D-218 for
damage.
Q: Is front blower relay connector D-218 in good
condition?
YES : Go to Step 6.
NO : Repair or replace the connector. Refer to GROUP
00E, Harness Connector Inspection
blower motor should operate normally.
AC204173
CONNECTOR : D-218
BE
JUNCTION BLOCK
SIDE
1
2
5
4
3
AC204738 DG
JUNCTION BLOCK SIDE : D-218
1
2
5
4
3
AC204173
CONNECTOR : D-218
BE
JUNCTION BLOCK
SIDE
1
2
5
4
3
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-64
STEP 6. Check the wiring harness between front blower
relay connector D-218 (terminal 3) and the ignition switch
(IG2).
NOTE: Also check junction block connector D-208. If junction
block connector D-208 is damaged, repair or replace the con-
nector as described in GROUP 00E, Harness Connector
Inspection
.
Q: Is the wiring harness between front blower relay
connector C-218 (terminal 3) and the ignition switch
(IG2) in good condition?
YES : The front blower motor should operate normally.
NO : Repair the wiring harness. The blower motor should
operate normally.
STEP 7. Measure the voltage at front blower relay
connector D-218.
(1) Disconnect front blower relay connector D-218, and
measure the voltage at the junction block side.
(2) Measure the voltage between terminal 2 and ground.
• The measured value should be approximately 12 volts
(battery positive voltage).
Q: Does the measured voltage correspond with this range?
YES : Go to Step 10.
NO : Go to Step 8.
AC204191
JUNCTION BLOCK
(FRONT VIEW)
AC204191
CONNECTORS : D-208, D-218
D-208
HARNESS SIDE
D-218
RELAY SIDE
AT
D-208
D-218
1
2
3
5
6
4
1
2
5
4
3
AC204173
CONNECTOR : D-218
BE
JUNCTION BLOCK
SIDE
1
2
5
4
3
AC204738 DF
JUNCTION BLOCK SIDE : D-218
1
2
5
4
3
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