DUAL A/C CONTROL DOES NOT OPERATE [FULL-AUTO AIR CONDITIONER]
id0703c1701100
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DESCRIPTION
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• Driver or passenger side temperature control dial does not operate individually
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POSSIBLE CAUSE
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L.H.D.:
• Air mix door malfunction (driver or passenger-side)
• Air mix actuator malfunction (driver or passenger-side)
• Climate control unit malfunction
• Open circuit in wiring harness between the following terminals:
Driver-side
Passenger-side
• Short to ground in wiring harness between the following terminals:
Driver-side
Passenger-side
• Short to power supply in wiring harness between the following terminals:
Driver-side
Passenger-side
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POSSIBLE CAUSE
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R.H.D.:
• Air mix door malfunction (driver or passenger-side)
• Air mix actuator malfunction (driver or passenger-side)
• Climate control unit malfunction
• Open circuit in wiring harness between the following terminals:
Driver-side
Passenger-side
• Short to ground in wiring harness between the following terminals:
Driver-side
Passenger-side
• Short to power supply in wiring harness between the following terminals:
Driver-side
Passenger-side
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Diagnostic Procedure
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Step |
Inspection |
Action |
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1
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VERIFY SYMPTOM
• Turn on the A/C.
• Perform the dual A/C control function for driver and passenger side individually.
• Is it either the temperature control on driver side or passenger side?
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Yes
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Go to the next step.
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No
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Go to Step 12.
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2
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INSPECT TO SEE WHETHER MALFUNCTION IS IN AIR MIX DOOR OR ELSEWHERE
• Turn on the A/C.
• Change temperature control on the suspected side while in dual mode.
• Does the air mix door on the suspect side move smoothly?
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Yes
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Go to Step 8.
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No
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Go to the next step.
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3
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INSPECT AIR MIX ACTUATOR
• Inspect the air mix actuator on the suspect side.
(See AIR MIX ACTUATOR INSPECTION.)
• Is the air mix actuator normal?
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Yes
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Go to the next step.
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No
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Replace the air mix actuator on the suspected side, then go to Step 15.
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4*
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INSPECT AIR MIX ACTUATOR CIRCUIT FOR SHORT TO GROUND
• Disconnect the climate control unit connector.
• Inspect for continuity between the following terminals (wiring harness-side) and body ground:
Driver-side (L.H.D.)
Passenger-side (L.H.D.)
Driver-side (R.H.D.)
Passenger-side (R.H.D.)
• Is there continuity?
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Yes
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Refer to the wiring diagram and verify whether or not there is a common connector between climate control unit terminal and air mix actuator terminal.
If there is a common connector:
• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.
• Repair or replace the malfunctioning part.
If there is no common connector:
• Repair or replace the wiring harness which has a short to ground.
Go to Step 15.
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No
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Go to the next step.
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5*
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INSPECT AIR MIX ACTUATOR CIRCUIT FOR OPEN CIRCUIT
• Air mix actuator and climate control unit connectors are disconnected.
• Inspect for continuity between the following terminals (wiring harness-side):
Driver-side (L.H.D)
Passenger-side (L.H.D)
Driver-side (R.H.D)
Passenger-side (R.H.D)
• Is there continuity?
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Yes
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Go to the next step.
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No
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Refer to the wiring diagram and verify whether or not there is a common connector between climate control unit terminal and air mix actuator terminal.
If there is a common connector:
• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.
• Repair or replace the malfunctioning part.
If there is no common connector:
• Repair or replace the wiring harness which has an open circuit.
Go to Step 15.
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6*
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INSPECT AIR MIX ACTUATOR CIRCUIT FOR SHORT TO POWER SUPPLY
• Air mix actuator and climate control unit connectors are disconnected.
• Connect the negative battery terminal.
• Switch the ignition ON (engine off or on).
• Measure the voltage at the following terminals (wiring harness-side):
Driver-side (L.H.D.)
Passenger-side (L.H.D.)
Driver-side (R.H.D.)
Passenger-side (R.H.D.)
• Is the voltage 0 V?
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Yes
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Go to the next step.
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No
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Refer to the wiring diagram and verify whether or not there is a common connector between climate control unit terminal and air mix actuator terminal.
If there is a common connector:
• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to power supply.
• Repair or replace the malfunctioning part.
If there is no common connector:
• Repair or replace the wiring harness which has a short to power supply.
Go to Step 15.
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7
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INSPECT AIR MIX DOOR
• Inspect the suspect side air mix door.
• Is the air mix door normal?
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Yes
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Replace the climate control unit, then go to Step 15.
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No
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Remove the obstruction or replace A/C unit case on the suspected side, then go to Step 15.
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8*
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INSPECT AIR MIX ACTUATOR POSITION SENSOR
• Inspect the air mix actuator position sensor on the suspected side.
(See AIR MIX ACTUATOR INSPECTION.)
• Is the air mix actuator position sensor normal?
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Yes
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Go to the next step.
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No
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Replace the air mix actuator on the suspected side, then go to Step 15.
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9*
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INSPECT AIR MIX ACTUATOR (POSITION SENSOR) CIRCUIT FOR SHORT TO GROUND
• Disconnect the climate control unit connector.
• Inspect for continuity between the following terminals (wiring harness-side) and body ground:
Driver-side (L.H.D.)
Passenger-side (L.H.D.)
Driver-side (R.H.D.)
Passenger-side (R.H.D.)
• Is there continuity?
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Yes
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Refer to the wiring diagram and verify whether or not there is a common connector between climate control unit terminal and air mix actuator terminal.
If there is a common connector:
• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.
• Repair or replace the malfunctioning part.
If there is no common connector:
• Repair or replace the wiring harness which has a short to ground.
Go to Step 15.
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No
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Go to the next step.
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10*
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INSPECT AIR MIX ACTUATOR (POSITION SENSOR) CIRCUIT FOR OPEN CIRCUIT
• Air mix actuator and climate control unit connectors are disconnected.
• Inspect for continuity between the following terminals (wiring harness-side):
Driver-side (L.H.D.)
Passenger-side (L.H.D.)
Driver-side (R.H.D.)
Passenger-side (R.H.D.)
• Is there continuity?
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Yes
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Go to the next step.
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No
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Refer to the wiring diagram and verify whether or not there is a common connector between climate control unit terminal and air mix actuator terminal.
If there is a common connector:
• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.
• Repair or replace the malfunctioning part.
If there is no common connector:
• Repair or replace the wiring harness which has an open circuit.
Go to Step 15.
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11*
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INSPECT AIR MIX ACTUATOR (POSITION SENSOR) CIRCUIT FOR SHORT TO POWER SUPPLY
• Air mix actuator and climate control unit connectors are disconnected.
• Connect the negative battery terminal.
• Switch the ignition ON (engine off or on).
• Measure the voltage at the following terminals (wiring harness-side):
Driver-side (L.H.D.)
Passenger-side (L.H.D.)
Driver-side (R.H.D.)
Passenger-side (R.H.D.)
• Is the voltage 0 V?
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Yes
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Replace the climate control unit, then go to Step 15.
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No
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Refer to the wiring diagram and verify whether or not there is a common connector between climate control unit terminal and air mix actuator terminal.
If there is a common connector:
• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to power supply.
• Repair or replace the malfunctioning part.
If there is no common connector:
• Repair or replace the wiring harness which has a short to power supply.
Go to Step 15.
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12*
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INSPECT AIR MIX ACTUATOR (POSITION SENSOR) CIRCUIT FOR SHORT TO GROUND
• Switch the ignition off.
• Disconnect the negative battery terminal.
• Disconnect the climate control unit connector.
• Disconnect the air mix actuator connector.
• Inspect for continuity between the following terminals (wiring harness-side) and body ground:
• Is there continuity?
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Yes
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Refer to the wiring diagram and verify whether or not there is a common connector between climate control unit terminal and each actuator / sensor terminal.
If there is a common connector:
• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.
• Repair or replace the malfunctioning part.
If there is no common connector:
• Repair or replace the wiring harness which has a short to ground.
Go to Step 15.
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No
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Go to the next step.
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13*
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INSPECT AIR MIX ACTUATOR (POSITION SENSOR) CIRCUIT FOR OPEN CIRCUIT
• Air mix actuator and climate control unit connectors are disconnected.
• Inspect for continuity between the following terminals (wiring harness-side):
Driver-side (L.H.D.)
Passenger-side (L.H.D.)
Driver-side (R.H.D.)
Passenger-side (R.H.D.)
• Is there continuity?
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Yes
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Go to the next step.
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No
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Refer to the wiring diagram and verify whether or not there is a common connector between climate control unit terminal and air mix actuator terminal.
If there is a common connector:
• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.
• Repair or replace the malfunctioning part.
If there is no common connector:
• Repair or replace the wiring harness which has an open circuit.
Go to Step 15.
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14*
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INSPECT AIR MIX ACTUATOR (POSITION SENSOR) CIRCUIT FOR SHORT TO POWER SUPPLY
• Air mix actuator and climate control unit connectors are disconnected.
• Connect the negative battery terminal.
• Switch the ignition ON (engine off or on).
• Measure the voltage at the terminals (wiring harness-side):
• Is the voltage 0 V?
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Yes
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Replace the climate control unit.
Go to the next Step.
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No
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Refer to the wiring diagram and verify whether or not there is a common connector between climate control unit terminal and each actuator / sensor terminal.
If there is a common connector:
• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to power supply.
• Repair or replace the malfunctioning part.
If there is no common connector:
• Repair or replace the wiring harness which has a short to power supply.
Go to the next step.
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15
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VERIFY THAT MALFUNCTION SYMPTOMS DO NOT RECUR AFTER REPAIR
• Can the temperatures for the driver-side and passenger-side be adjusted independently?
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Yes
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Troubleshooting completed. Explain repairs to customer.
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No
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Recheck malfunction symptoms, then repeat from Step 1 if malfunction recurs.
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