2005 MITSUBISHI 380 ignition switch cir

AUTO A/C DIAGNOSIS
HEATER, AIR CONDITIONING AND VENTILATION55-69
SYMPTOM PROCEDURES
INSPECTION PROCEDURE 1: When the Ignition Switch is "ON", the A/C does not Operate.
.
TECHNICAL DESCRIPTION (COMMENT)
The blower system or the compressor system may
be defective if there is no cool air coming from the
vents.
.
TROUBLESHOOTING HINTS
Malfunction of blower motor
Malfunction of A/C compressor
Refer to component locations GROUP-70
Refer to configuration diagrams GROUP-80
Refer to circuit diagrams GROUP-90
DIAGNOSIS
Check that the blower motor operation when the blower
switch is moved to the "HI" position.
(1) Turn the ignition switch to the "ON" position.
(2) Turn the blower speed selection dial to the blower operating
position.
Q: Does the blower motor operate when the speed
selection dial is turned to the blower operating
position?
YES : Refer to Inspection procedure 4 "When the A/C is
operating, temperature inside the passenger
compartment does not decrease (cool air not emitted)
P.55-75."
NO : Refer to Inspection procedure 5 "Blower fan and
motor do not turn P.55-89."
INSPECTION PROCEDURE 2: When the Air Outlet Changeover Control Knob is Moved to
DEFROSTER or DEFROSTER/FOOT Position, the A/C or the Inside/outside Air Changeover Damper
Motor does not operate.
.
TECHNICAL DESCRIPTION (COMMENT)
If the outside/inside air selection damper control
motor does not operate normally, the inside/outside
air changeover damper motor system may be defec-
tive.
.
TROUBLESHOOTING HINTS
Malfunction of the A/C-ECU
Malfunction of the outside/inside air selection
damper control motor
Damaged harness wires or connectors
Refer to component locations GROUP-70
Refer to configuration diagrams GROUP-80
Refer to circuit diagrams GROUP-90

AUTO A/C DIAGNOSIS
HEATER, AIR CONDITIONING AND VENTILATION55-70
DIAGNOSIS
Check operation of the outside/inside air selection damper
control motor.
(1) Turn the ignition switch to the "ON" position.
(2) Outside/inside air selection damper motor switch: This is
used to switch from the inside air to outside air or vice
versa.
(3) Check to see that the outside/inside air selection damper
motor operates normally.
Q: Does outside/inside air selection damper control motor
work normally?
YES : Replace the A/C-ECU.
NO : Refer to Inspection procedure 3, "Inside/outside air
changeover is not possible P.55-70."
INSPECTION PROCEDURE 3: Outside/Inside Air Changeover is not possible.
.
CIRCUIT OPERATION
If the outside/inside air selection damper control
motor does not operate normally, the outside/inside
air selection damper control motor system may be
defective.
.
TROUBLESHOOTING HINTS
Malfunction of the outside/inside air selection
damper control motor
Malfunction of the A/C-ECU
Damaged harness wires or connectors
Refer to component locations GROUP-70
Refer to configuration diagrams GROUP-80
Refer to circuit diagrams GROUP-90
DIAGNOSIS
Required Special Tool:
MB991223: Test Harness Set
STEP 1. Check the defogger and A/C operations.
Q: Do the defogger and A/C work normally?
YES : Go to Step 2.
NO : Refer to Inspection procedure 10 "Malfunction of the
A/C-ECU power supply system P.55-122."

AUTO A/C DIAGNOSIS
HEATER, AIR CONDITIONING AND VENTILATION55-92
STEP 4. Check the blower relay continuity.
Follow the table below to check the blower relay for continuity.
Q: Is the blower relay continuity in good condition?
YES : Go to Step 5.
NO : Replace the blower relay. The blower motor should
operate normally.
STEP 5. Measure the voltage at blower relay connector
C-202.
(1) Disconnect blower relay connector C-202, and measure the
voltage at the junction block side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 1 and ground.
The measured value should be approximately 12 volts
(battery positive voltage).
Q: Is the measured voltage approx. 12 volts?
YES : Go to Step 7.
NO : Go to Step 6. BATTERY
VOLTAGETESTER
CONNECTIONSPECIFIED
CONDITION
Not applied 4
5 Open circuit
Connect
terminal 1 to the
positive battery
terminal
Connect
terminal 3 to the
negative battery
terminal4
5 Less than 2 ohms

AUTO A/C DIAGNOSIS
HEATER, AIR CONDITIONING AND VENTILATION55-104
INSPECTION PROCEDURE 7: The A/C Indicator Flashes.
.
TECHNICAL DESCRIPTION (COMMENT)
If the A/C indicator flashes, inadequate refrigerant
quantity, the ambient air temperature sensor circuit
or the A/C pressure sensor circuit is suspected.
.
TROUBLESHOOTING HINTS
Malfunction of the A/C pressure sensor
Malfunction of the ambient air temperature sen-
sor
Malfunction of the A/C-ECU
Refer to component locations GROUP-70
Refer to configuration diagrams GROUP-80
Refer to circuit diagrams GROUP-90
DIAGNOSIS
Required Special Tools:
MB991223: Test Harness Set
: Scan Tool (MUT-III Sub Assembly)
MB991824: Vehicle Communication Interface (V.C.I.)
MB991827: MUT-III USB Cable
MB991910: MUT-III Main Harness A (Vehicles with CAN
communication system)
STEP 1. Using scan tool , read the diagnostic trouble code.
Check if an A/C-ECU DTC is set.
(1) Connect scan tool to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Check if the DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the check result satisfactory?
YES : Go to Step 2.
NO : Refer to DIAGNOSTIC TROUBLE CODE CHART
P.55-9.

AUTO A/C DIAGNOSIS
HEATER, AIR CONDITIONING AND VENTILATION55-134
Air outlet c/o
potentiometer55 Mode selection
damper control
motor potentiometerIgnition switch: ON Damper
positionOpening degree (V)
FA C E A p pr o x . 5
FOOT Approx. 3.75
FOOT/DEF. Approx. 2.5
DEF. Approx. 1.75
Air outlet c/o
potentiometer
(target)56 Target value for
mode selection
damper control
motor potentiometerIgnition switch: ON Damper
positionOpening degree (V)
FA C E A p pr o x . 5
FOOT Approx. 3.75
FOOT/DEF. Approx. 2.5
DEF. Approx. 1.75
In/out air
changeover
damper motor65 Outside/inside air
selection damper
control motorIgnition switch: ON Damper set
positionDamper position
Fresh air
positionFRESH
Air recirculation
positionRECIRC
Front blower fan 68 Blower motor Ignition switch: ON The actual air
volume (blower
motor speed)
corresponds to the
air volume shown on
the diagnostic tool.
Front blower
motor voltage 71 Blower motor Ignition switch: ON The air volume set
by the heater control
corresponds to the
value shown on the
diagnostic tool. (V)
Air conditioning
switch state1 Air conditioning
switchIgnition switch: ON Air conditioning
switch: ONDiagnostic tool
indication: "pressed"
Air conditioning
switch: OFFDiagnostic tool
indication: "release"
Rear defogger
switch state7 Rear window
defogger switchIgnition switch: ON Rear window
defogger
switch: ONDiagnostic tool
indication: "pressed"
Rear window
defogger
switch: OFFDiagnostic tool
indication: "release"
Refrigerant
pressure73 Refrigerant pressure Ignition switch: ON The diagnostic tool
indication is normal MUT-III
DIAGNOSTIC
TOOL DISPLAYITEM
NO.INSPECTION ITEM INSPECTION REQUIREMENT NORMAL VALUE

AUTO A/C DIAGNOSIS
HEATER, AIR CONDITIONING AND VENTILATION55-137
CHECK AT A/C-ECU TERMINALM1552010300572
TERMINAL
NO.CHECK ITEM CHECKING REQUIREMENTS NORMAL CONDITION
1 Air mixing damper control motor When the air mix damper is
moved to the MAX. COOL
position. 10 V
When the air mix damper is
moved to the MAX. HOT
position. 0.5 V
2 Air mixing damper control motor When the air mix damper is
moved to the MAX. COOL
position. 0.5 V
When the air mix damper is
moved to the MAX. HOT
position. 10 V
3 Back-up power supply Always Battery positive voltage
4 Mode selection damper control
motor (DEF)When the damper is moved to
the FACE position. 0.5 V
When the damper is moved to
the DEF position. 10 V
5 Outside/inside air selection
damper control motor (outside)When the damper is moved to
the inside air recirculation
position.0.5 V
When the damper is moved to
the outside air induction
position.0 V (when the motor is
stopped)
6 Outside/inside air selection
damper control motor (inside)When the damper is moved to
the inside air recirculation
position.0 V (when the motor is
stopped)
When the damper is moved to
the outside air induction
position.0.5 V
8 Rear defogger relay Ignition switch: ON Battery positive voltage
9 Front blower relay Ignition switch: ON Battery positive voltage
10 A/C compressor relay A/C compressor relay: ON Battery positive voltage
11 Mode selection damper control
motor (FACE)When the damper is moved to
the FACE position. 10 V
When the damper is moved to
the DEF position. 0.5 V
12 A/C pressure sensor Ignition switch: ON 5 V

HOW TO DIAGNOSE
GENERAL 00E-6
5. Ohmmeter
An ohmmeter is used to check continuity or measure
resistance of a switch or coil. If the measuring range has
been changed, the zero point must be adjusted before
measurement.
CHECKING FUSESM1001005000044
A blade type fuse has test taps provided to allow checking of
the fuse itself without removing it from the fuse block. The fuse
is okay if the test light comes on when its one lead is connected
to the test taps (one at a time) and the other lead is grounded.
Remember to turn the ignition switch to ON to ensure all cir-
cuits are live.
CAUTIONS IN EVENT OF BLOWN FUSE
When a fuse is blown, there are two probable causes. One is
that it is blown due to flow of current exceeding its rating. The
other is that it is blown due to repeated on/off current flowing
through it. Which of the two causes is responsible can be easily
determined by visual check as described below.
1. Fuse blown due to current exceeding rating
The illustration shows the state of a fuse blown due to this
cause. In this case, do not replace the fuse with a new one
hastily since a current heavy enough to blow the fuse has
flowed through it. First, check the circuit for shorts and check
for abnormal electric parts. After correcting shorts or
replacing parts, use only a fuse of the same capacity as a
replacement. Never use a fuse of larger capacity than the
original fuse. If a larger capacity fuse is used, electric parts
or wiring could be damaged, or could start a fire.
2. Fuse blown due to repeated turning current on and off
The illustration shows the state of a fuse blown due to
repeated current on/off. Normally, this type of problem
occurs after a fairly long period of use and is less frequent
than above. In this case, simply replace with a new fuse of
the same capacity.

CHARGING SYSTEM
ENGINE ELECTRICAL16-3
CHARGING SYSTEM DIAGNOSISM1161000700427
TROUBLESHOOTING HINTS
Alternator malfunction light dose not go on when the ignition
switch is turned to ON, before the engine starts.
Check the bulb.
Alternator malfunction light dose not switch off after the engine
starts.
Check the IC voltage regulator inside the
alternatoralternator.
Discharged or overcharged battery.
Check the IC voltage regulator inside the alternator.
The alternator malfunction light illuminates dimly.
Check the diode (inside the combination meter) for a
short-circuit.
TROUBLESHOOTING GUIDE
The charging system troubleshooting guide is shown in the fol-
lowing steps.
STEP 1.
Q: Is the battery in good condition? (Refer to GROUP 54A,
Chassis Electrical
Battery On-vehicle Service
Battery Check P.54A-5.)
YES : Go to Step 2.
NO : Charge or replace the battery.
STEP 2.
Q: Is the alternator drive belt in good condition? (Refer to
GROUP 00, General
Maintenance Service Drive Belts
(For Alternator, Power Steering Pump and Air
Conditioning) (Check) P.00-39.)
YES : Go to Step 3.
NO : Adjust the belt tension or replace the belt.
STEP 3.
Q: Does the alternator malfunction light come on when the
ignition switch is turned on?
YES : Go to Step 4.
NO :
Check the ignition switch. (Refer to GROUP 54A,
Chassis Electrical
Ignition Switch Ignition
Switch
Inspection P.54A-44.)
Check for burnt-out alternator malfunction light.
Check the alternator. (Refer to Charging System
Alternator Assembly
Inspection P.16-17.)
Check the alternator malfunction light-related
circuits.