Mitsubishi Galant 9G. Manual — part 291
MANUAL A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55A-240
STEP 15. Check defogger connector D-08 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is defogger connector D-08 in good condition?
YES : Go to Step 16.
NO : Repair or replace the connector. Refer to GROUP
00E, Harness Connector Inspection
. Check
that the defogger system works normally.
STEP 16. Check the wiring harness between defogger
connector D-08 (terminal 1) and choke coil connector D-13
(terminal 1).
Q: Is the wiring harness between defogger connector D-08
(terminal 1) and choke coil connector D-13 (terminal 1)
in good condition?
YES : Go to Step 17.
NO : Repair or replace the wiring harness. Refer to
GROUP 00E, Harness Connector Inspection
. Check that the defogger system works
normally.
AC305268
CONNECTOR: D-08
AK
HARNESS SIDE
AC305269
CONNECTORS: D-08, D-13
D-08
D-13
HARNESS SIDE
D-08
HARNESS SIDE
D-13
AD
MANUAL A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55A-241
STEP 17. Check the defogger.
(1) Let the engine run at 2,000 r/min, and check the printed
heater with the battery fully charged.
(2) Turn on the defogger switch, and use a voltmeter to
measure the voltage in each printed heater at middle point
A on the rear window glass.
• The value should be approximately 6 volts.
Q: Does the defogger work normally?
YES : Replace the A/C-ECU. Check that the defogger
system works normally.
NO : Repair the defogger.
INSPECTION PROCEDURE 9: Defogger Timer Function does not Operate.
.
CIRCUIT OPERATION
Turn ON the defogger switch. If the defogger does
not shut off after about 16 minutes then the defogger
timer is malfunctioning.
.
TROUBLESHOOTING HINT
• Malfunction of the A/C-ECU
• Malfunction of the defogger timer
DIAGNOSIS
Replace the A/C-ECU.
12 V
6V
0V
12 V
6V
0V
AC100595
A
NORMAL CHARACTERISTIC CURVE
ABNORMAL CHARACTERISTIC 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
AB
MANUAL A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55A-242
INSPECTION PROCEDURE 10: Malfunction of the A/C-ECU Power Supply System.
IGNITION
SWITCH (IG2)
IGNITION
SWITCH (ACC)
BATTERY
RELAY
BOX
JOINT
CONNECTOR (1)
JOINT
CONNECTOR (2)
JUNCTION
BLOCK
JOINT
CONNECTOR (2)
POWER SUPPLY
A/C-ECU
A/C-ECU Power Supply Circuit
AC305231CI
CONNECTORS: C-01, C-03, C-29
C-01
C-03
C-29
AC305233
C-16 (B)
C-15 (B)
CONNECTORS: C-15, C-16
BE
MANUAL A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55A-243
.
TECHNICAL DESCRIPTION (COMMENT)
The A/C-ECU power system may be defective if the
air conditioner, defogger, and outside/inside air
selection damper motor all do not operate normally.
.
TROUBLESHOOTING HINTS
• Malfunction of the A/C-ECU
• Damaged harness wires or connectors
DIAGNOSIS
Required Special Tool:
• MB991223: Test Harness Set
STEP 1. Check A/C-ECU connector C-16 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is A/C-ECU connector C-16 in good condition?
YES : Go to Step 2.
NO : Repair or replace the connector. Refer to GROUP
00E, Harness Connector Inspection
. Check
that the air conditioning works normally.
AC305415
CONNECTORS: C-211, C-215
JUNCTION BLOCK
(FRONT VIEW)
C-215
C-211
BA
AC305233
HARNESS SIDE
C-16 (B)
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
BX
CONNECTOR: C-16
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