2000 MITSUBISHI MONTERO Service Repair Manual

HEATER, AIR CONDITIONER AND VENTILATION -Troubleshooting 55B-22
Inspection procedure 3
The rear blower does not operate.
Probable cause
If no air comes out of the air vents even if the rear fan switch or the front rear
fan switch is turned on, the rear blower relay circuit may be defective.DMalfunction of the rear blower relay
DMalfunction of the blower motor
DMalfunction of the rear A/C switch
DMalfunction of harness or connector
OK
Replace the rear A/C control unit.
OK
NG
Repair
NG
Repair
NG
Check the harness wire between the rear blower relay and
the ignition switch (IG2), and repair if necessary.
NG
Repair
NG
Check the harness wire between the rear blower relay and
fusible link (2), and repair if necessary.
NG
Repair
NG
Check the harness wires between the rear blower relay and
the rear A/C switch and between the rear blower relay and
the front rear fan switch, and repair if necessary.
NG
Repair
NG
Check the harness wire between the blower motor and the
rear A/C switch and between the rear A/C switch and body
earth, and repair if necessary.
NG
Repair
OK
Check the trouble symptoms.
OK
Check the following connectors:D-214, D-123, G-22,
G-22-1
OK
Check the trouble symptoms.
OK
Measure at blower motor connector G-22-1.
DDisconnect the connector and measure at the harness
side.
DAir volume adjusting switch: 3
DContinuity between terminal 1 and body earth
OK:ContinuityNGCheck the following connectors:G-22-1, G-22, E-119
OK
Check the trouble symptoms.
Check the following connectors:D-214, D-123, E-119,
E-109, E-14
(3) NG
OK
Check the trouble symptoms.
Check the following connectors:D-214, D-27(2) NG
OK
Check the trouble symptoms.
OK
Measure at rear blower relay connector D-214.
DDisconnect the connector and measure at the harness
side.
DIgnition switch: ON
(1) Voltage between terminal 1 and body earth
OK:System voltage
(2) Voltage between terminal 5 and body earth
OK:System voltage
(3) Voltage between terminal 3 and body earth
OK:0 V (Rear fan switch or front rear fan switch: ON)(1) NGCheck the following connectors:D-214, D-32, D-210, D-208
OK
Check the rear A/C switch (air volume adjusting switch)
(Refer to GROUP 55A - Rear Heater/Rear Cooler).NG
Replace
OK
Check the blower motor
(Refer to GROUP 55A - Rear Heater/Rear Cooler).NG
Replace
Check the rear blower relay
(Refer to GROUP 55A - On-vehicle Service).NG
Replace
Check the harness wire between the blower motor and the
rear blower relay.


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HEATER, AIR CONDITIONER AND VENTILATION -Troubleshooting 55B-23
Inspection procedure 4
The rear blower air volume can not be changed.
Probable cause
If the air volume can not be controlled, the air volume adjusting switch or the
resistor may be defective.DMalfunction of the rear A/C switch
DMalfunction of the resistor
DMalfunction of harness or connector
NG
Repair
NG
Repair
NG
Check the harness wire between the rear A/C switch and
body earth, and repair if necessary.
NG
Check the harness wire between the rear A/C switch and the
resistor and between the resistor and the blower motor, and
repair if necessary.
OK
Check the trouble symptoms.
OK
Check the trouble symptoms.
OK
Check the following connectors:E-119, G-22, G-22-2,
G-22-1
NG
Measure at rear A/C switch connector E-119.
DDisconnect the connector and measure at the harness
side.
DContinuity between terminal 1 and body earth
OK:ContinuityNGCheck the following connectors:E-119
OK
Check the resistor (Refer to GROUP 55A - Rear Heater/Rear
Cooler).NG
Replace
Check the rear A/C switch (air volume adjusting switch)
(Refer to GROUP 55A - Rear Heater/Rear Cooler).NG
Replace
Inspection procedure 5
Air outlet vents can not be changed in proportion to the
temperature adjusting switch.
Probable cause
If the air outlet temperature can not be changed after a temperature control
switch is operated, the air outlet changeover damper may be defective.DMalfunction of the electric motor for the air outlet
changeover damper
DMalfunction of harness or connector
DMalfunction of the rear A/C control unit
Repair
NG
Repair
Check the trouble symptoms.NGReplace the rear A/C control unit.
OK
Replace the air outlet
changeover damper motor.
NG
NG
Check the harness wire between the air outlet changeover
damper motor and the ignition switch (IG2), and repair if
necessary.
NG
RepairNG
Repair
NG
Check the harness wire between the air outlet changeover
damper motor and body earth, and repair if necessary.
NG
Check the harness wire between the air outlet changeover
damper motor and the rear A/C control unit.
OK
Check the trouble symptoms.
OK
Check the following connectors:G-22-3, G-22, D-123, E-23
OK
Check the trouble symptoms.
Check the following connectors:G-22-3, G-22
(2) NG
OK
Check the trouble symptoms.
YES
Measure at air outlet changeover damper motor connector
G-22-3.
DDisconnect the connector and measure at the harness
side.
DIgnition switch: ON
(1) Voltage between terminal 2 and body earth
OK:System voltage
(2) Continuity between terminal 1 and body earth
OK:Continuity(1) NGCheck the following connectors:G-22-3, G-22, D-123,
D-123, D-32, D-210, D-208
Can the air temperature be adjusted by means of the
temperature adjusting switch?NORefer to Inspection Procedure 2 (Refer to P.55-19).


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C
heck it e m C
heck co ndit io ns N
orm alco ndit io n 1 M
agnet va lv e M
agnet va lv e :O FF S
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agnet va lv e :O N F
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V 5 P
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