Mitsubishi Lancer (4A9 engine). Manual — part 293
AC612706
Connectors: C-15, C-109, C-110 <LHD>
AF
C-15 (B)
C-109
C-110
AC612710
Connectors: C-15, C-109, C-110 <RHD>
AT
C-15 (B)
C-109
C-110
AC612709
Connector: C-303<LHD>
AO
ETACS-ECU
AC612717
Connector: C-303 <RHD>
AO
ETACS-ECU
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55A-53
COMMENTS ON TROUBLE SYMPTOM
If the blower motor does not operate, the blower
motor circuit system may be defective.
PROBABLE CAUSES
• Malfunction of the blower motor
• Malfunction of the power transistor
• Malfunction of the A/C-ECU
• Damaged wiring harness or connectors
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Repair the CAN bus lines (Refer to GROUP
54C
− Troubleshooting ).
STEP 2. M.U.T.-III diagnosis code.
Recheck if the diagnosis code is set.
(1) Erase the diagnosis code.
(2) Ignition switch: LOCK (OFF) to ON
(3) Check if the diagnosis code is set.
Q: Is the diagnosis code set?
YES :
Carry out the diagnosis code procedures.
Refer to .
NO :
Go to Step 3.
STEP 3. Connector check: C-303 blower relay
connector
Q: Is the check result normal?
YES :
Go to Step 4.
NO :
Repair the connector.
STEP 4. Check the blower relay.
Refer to .
Q: Is the blower relay in good condition?
YES :
Go to Step 5.
NO :
Replace the blower relay.
STEP 5. Connector check: C-110 blower motor
connector
Q: Is the check result normal?
YES :
Go to Step 6.
NO :
Repair the connector.
STEP 6. Check the blower motor.
Refer to .
Q: Is the check result normal?
YES :
Go to Step 7.
NO :
Replace the blower motor.
STEP 7. Voltage measurement at C-110 blower
motor connector.
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Turn the ignition switch to the ON position.
(3) Voltage between terminal 1 and body earth.
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55A-54
<LHD>
OK: System voltage
(4) Voltage between terminal 2 and body earth.
<RHD>
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 8.
NO :
INSPECTION PROCEDURE 14: Refer to
"Blower motor power supply system" .
STEP 8. Connector check: C-109 power
transistor controller connector
Q: Is the check result normal?
YES :
Go to Step 9.
NO :
Repair the connector.
STEP 9. Resistance measurement at the C-109
power transistor connector.
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Continuity between terminal 1 and body earth
OK: Continuity exists (2
Ω or less)
Q: Is the check result normal?
YES :
Go to Step 10.
NO :
Repair the wiring harness wires between
power transistor connector terminal No. 1
and body earth.
STEP 10. Check the wiring harness between C-
110 blower motor connector terminal No.2 <LHD>
or 1 <RHD> and C-109 power transistor
connector terminal No.2.
• Check the power transistor power supply line for
open circuit.
Q: Is the check result normal?
YES :
Go to Step 11.
NO :
Repair the wiring harness.
STEP 11. Connector check: C-15 A/C-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 12.
NO :
Repair the connector.
STEP 12. Check the wiring harness between C-
110 blower motor connector terminal No.2 <LHD>
or 1 <RHD> and C-15 A/C-ECU connector
terminal No.1.
• Check the blower motor power supply line for
open circuit.
Q: Is the check result normal?
YES :
Go to Step 13.
NO :
Repair the wiring harness.
STEP 13. Check the wiring harness between C-
109 power transistor connector terminal No.4
and C-15 A/C-ECU connector terminal No.2.
• Check the power transistor power supply line for
open circuit.
Q: Is the check result normal?
YES :
Go to Step 14.
NO :
Repair the wiring harness.
STEP 14. Check the wiring harness between C-15
A/C-ECU connector terminal No.14 and body
earth.
• Check the power transistor power supply line for
open circuit.
Q: Is the check result normal?
YES :
Go to Step 15.
NO :
Repair the wiring harness.
STEP 15. Replace the power transistor and
recheck the trouble symptom
Check that the blower motor operates normally.
Q: Is the check result normal?
YES :
This diagnosis is complete.
NO :
Replace the A/C-ECU.
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55A-55
INSPECTION PROCEDURE 4: The blower air volume cannot be changed
Blower Motor Circuit
FUSIBLE
LINK
37
BLOWER
RELAY
ETACS-
ECU
A/C-ECU
BLOWER
MOTOR
POWER
TRANSISTOR
NOTE
: LHD
: RHD
Wire colour code
B : Black LG : Light green G : Green L : Blue W : White Y : Yellow SB : Sky blue
BR : Brown O : Orange GR : Grey R : Red P : Pink V : Violet PU : Purple SI : Silver
FUSIBLE
LINK
42
<4N1>
<4A9, 4J1, 4B1>
ACB02688
AC612706
Connectors: C-15, C-109, C-110 <LHD>
AF
C-15 (B)
C-109
C-110
AC612710
Connectors: C-15, C-109, C-110 <RHD>
AT
C-15 (B)
C-109
C-110
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55A-56
COMMENTS ON TROUBLE SYMPTOM
If air volume cannot be adjusted by using the blower
control, the A/C control panel, the A/C-ECU or the
power transistor may be faulty.
PROBABLE CAUSES
• Malfunction of the A/C control panel
• Malfunction of the power transistor
• Damaged wiring harness or connectors
• Malfunction of the A/C-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Repair the CAN bus lines (Refer to GROUP
54C, Troubleshooting ).
STEP 2. M.U.T.-III diagnosis code
Check that the diagnosis code related to the air con-
ditioner is not set.
Q: Is the diagnosis code set?
YES :
Carry out the diagnosis code procedures.
Refer to .
NO :
Go to Step 3.
STEP 3. Connector check: C-109 power
transistor controller connector
Q: Is the check result normal?
YES :
Go to Step 4.
NO :
Repair the connector.
STEP 4. Resistance measurement at the C-109
power transistor connector.
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Continuity between terminal 1 and body earth
OK: Continuity exists (2
Ω or less)
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Repair the wiring harness wires between
power transistor connector terminal No. 1
and body earth.
STEP 5. Connector check: C-15 A/C-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 6.
NO :
Repair the connector.
STEP 6. Check the wiring harness between C-110
blower motor connector terminal No.2 <LHD> or
1 <RHD> and C-15 A/C-ECU connector terminal
No.1.
• Check the blower motor earth line for open cir-
cuit.
Q: Is the check result normal?
YES :
Go to Step 7.
NO :
Repair the wiring harness.
STEP 7. Check the wiring harness between C-109
power transistor connector terminal No.4 and C-
15 A/C-ECU connector terminal No.2.
• Check the blower motor earth line for open cir-
cuit.
Q: Is the check result normal?
YES :
Go to Step 8.
NO :
Repair the wiring harness.
STEP 8. Check the wiring harness between C-15
A/C-ECU connector terminal No.14 and body
earth.
• Check the power transistor power supply line for
open circuit.
Q: Is the check result normal?
YES :
Go to Step 9.
NO :
Repair the wiring harness.
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