Mitsubishi Galant 9G. Manual — part 282
MANUAL A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55A-204
INSPECTION PROCEDURE 5: Front Blower Fan and Motor do not Turn.
IGNITION
SWITCH (IG2)
FUSIBLE
LINK
1
JUNCTION
BLOCK
BLOWER
RELAY
BLOWER
MOTOR
A/C-ECU
POWER TRANSISTOR
DRIVE CIRCUIT
POWER
TRANSISTOR
Blower Motor Circuit
MANUAL A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55A-205
.
CIRCUIT OPERATION
If the blower motor does not operate, the blower
relay system is suspected.
.
TROUBLESHOOTING HINTS
• Malfunction of the front blower relay
• Malfunction of the power transistor
• Malfunction of the front blower motor
• Malfunction of the A/C-ECU
• Damaged harness wires or connectors
AC305015AH
FUSIBLE LINK (1)
FUSIBLE LINKS
NO.1
AC305233BP
CONNECTORS: C-14, C-115
C-14
C-115
AC305231
CONNECTOR: C-29
AH
AC305415BD
CONNECTORS: C-202, C-211, C-215, C-216
JUNCTION BLOCK
(FRONT VIEW)
C-216 (B)
C-215
C-202
C-211
MANUAL A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55A-206
DIAGNOSIS
Required Special Tool:
• MB991223: Test Harness Set
STEP 1. Check blower motor connector C-115 and
A/C-ECU connector C-15 for loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Q: Are blower motor connector C-115 and A/C-ECU
connector C-15 in good condition?
YES : Go to Step 2.
NO : Repair or replace the connector. Refer to GROUP
00E, Harness Connector Inspection
.The
blower motor should operate normally.
AC305234
CONNECTORS: C-15, C-115
HARNESS SIDE
C-15
C-115
HARNESS SIDE
C-115
C-15 (B)
AQ
MANUAL A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55A-207
STEP 2. Measure the voltage at blower motor connector
C-115.
(1) Disconnect blower motor connector C-115, and measure
the voltage at the wiring harness side.
(2) Disconnect A/C-ECU connector C-15 and ground harness
side terminal No.9.
(3) Turn the ignition switch to the "ON" position.
(4) Measure the voltage between terminal 1 and ground.
• The measured value should be approx. 12 volts (battery
positive voltage).
Q: Is the measured voltage approx. 12 volts?
YES : Go to Step 11.
NO : Go to Step 3.
STEP 3. Check blower relay connector C-202 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is blower relay connector C-202 in good condition?
YES : Go to Step 4.
NO : Repair or replace the connector. Refer to GROUP
00E, Harness Connector Inspection
.The
blower motor should operate normally.
AC305233BN
CONNECTOR: C-115
HARNESS SIDE
AC306911
AC306911AB
CONNECTOR C-15
(HARNESS SIDE)
AC209365
CONNECTOR C-115
(HARNESS SIDE)
GW
AC305415BC
CONNECTOR: C-202
JUNCTION BLOCK SIDE
JUNCTION BLOCK
(FRONT VIEW)
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