Mitsubishi L200. Manual — part 849
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55A-12
STEP 9. Check the wiring harness between C-06
blower switch connector terminal No.2 and C-05
A/C switch module connector terminal No.4.
AC509611AX
Harness side
C-05
C-06
C-05
C-06
Harness side
Connectors: C-05, C-06 <LHD>
AC509932BD
Harness side
C-05
C-06
C-05
C-06
Harness side
Connectors: C-05, C-06 <RHD>
NOTE: Prior to the wiring harness inspection, check
joint connector C-10 and repair if necessary.
• Check the engine-ECU signal line for open and
short circuit.
• Check the blower switch signal line and earth line
for open and short circuit.
Q: Is the check result normal?
YES :
Go to Step 10 <Vehicles for EURO5>.
YES :
Go to Step 12 <Except for EURO5>.
NO :
Repair the wiring harness.
STEP 10. Connector check: C-103 engine-ECU
connector
AC903853
BX
Connector: C-103 <LHD>
C-103 (B)
Harness side
AC903865 BB
Connector: C-103 <RHD>
Harness side
C-103 (B)
Q: Is the check result normal?
YES :
Go to Step 11.
NO :
Repair the connector.
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55A-13
STEP 11. Check the wiring harness between C-
103 engine-ECU connector terminal No.125 and
C-05 A/C switch module connector terminal No.4.
AC509611AV
Connector: C-05 <LHD>
Harness side
AC903853
BX
Connector: C-103 <LHD>
C-103 (B)
Harness side
AC509932 BA
Harness side
Connector: C-05 <RHD>
AC903865 BB
Connector: C-103 <RHD>
Harness side
C-103 (B)
NOTE: Prior to the wiring harness inspection, check
intermediate connector C-52 <LHD> or C-34
<RHD>, and repair if necessary.
• Check the engine-ECU signal line for open and
short circuit.
Q: Is the check result normal?
YES :
Go to Step 12 .
NO :
Repair the wiring harness.
STEP 12. Connector check: C-21 A/C evaporator
air outlet thermistor connector
AC509611BA
Connector: C-21 <LHD>
Harness side
AC509932BF
Harness side
Connector: C-21 <RHD>
Q: Is the check result normal?
YES :
Go to Step 13.
NO :
Repair the connector.
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55A-14
STEP 13. Resistance measurement at the C-21 A/
C evaporator air outlet thermistor connector.
AC509611BA
Connector: C-21 <LHD>
Harness side
AC509932BF
Harness side
Connector: C-21 <RHD>
(1) Disconnect the connector, and measure at the
wiring harness side.
AC403234
Connector C-21
(Harness side)
CE
(2) Measure the resistance between terminal 1 and
body earth.
OK: Continuity (Less than 2
Ω)
Q: Is the check result normal?
YES :
Go to Step 15.
NO :
Go to Step 14.
STEP 14. Check the wiring harness between C-05
A/C switch module connector terminal No.5 and
body earth.
AC509611AV
Connector: C-05 <LHD>
Harness side
AC509932 BA
Harness side
Connector: C-05 <RHD>
• Check the A/C switch module earth line for open
circuit.
Q: Is the check result normal?
YES :
The trouble can be an intermittent
malfunction (Refer to GROUP 00, How to
Cope with Intermittent Malfunction ).
NO :
Repair the wiring harness.
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55A-15
STEP 15. Check the wiring harness between C-05
A/C switch module connector terminal No.3 and
C-21 A/C evaporator air outlet thermistor
connector terminal No.2.
AC509611BB
Harness side
C-05
C-21
C-05
C-21
Harness side
Connector: C-05, C-21 <LHD>
AC509932BI
Harness side
C-05
C-21
C-05
C-21
Harness side
Connector: C-05, C-21 <RHD>
• Check the input line for open and short circuit.
Q: Is the check result normal?
YES :
Go to Step 16.
NO :
Repair the wiring harness.
STEP 16. Connector check: A-38 dual pressure
switch connector
AC509977AG
Harness side
A-38 (BR)
Connector: A-38
Q: Is the check result normal?
YES :
Go to Step 17.
NO :
Repair the connector.
STEP 17. Check the dual pressure switch.
Refer to
Q: Is the check result normal?
YES :
Go to Step 18.
NO :
Replace the A/C receiver assembly.
STEP 18. Check the wiring harness between C-21
A/C evaporator air outlet thermistor connector
terminal No.4 and A-38 dual pressure switch
connector terminal No.2.
AC509977AG
Harness side
A-38 (BR)
Connector: A-38
AC509611BD
Harness side
C-54
C-21
C-54
C-21
Connectors: C-21, C-54 <LHD>
AC509932 BJ
Connectors: C-14, C-21 <RHD>
Harness side
C-14
C-21
C-14
C-21
NOTE: Prior to the wiring harness inspection, check
intermediate connector C-54 <LHD> or C-14
<RHD>, and repair if necessary.
• Check the dual pressure switch signal line.
Q: Is the check result normal?
YES :
Go to Step 19.
NO :
Repair the wiring harness.
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