NO.9 DUAL A/C CONTROL DOES NOT OPERATE [FULL-AUTO AIR CONDITIONER]

id0703c1812300

9
Dual A/C control function does not operate
DESCRIPTION
•  Driver or passenger side temperature control dial does not operate individually.
•  Temperature control operates normally except for dual A/C control function.
POSSIBLE CAUSE
•  Driver-side air mix door malfunction (stuck)
•  Passenger-side air mix door malfunction (stuck)
•  Driver-side air mix actuator malfunction
•  Passenger-side air mix actuator malfunction
•  Driver-side air mix actuator position sensor malfunction
•  Passenger-side air mix actuator position sensor malfunction
•  Open, short circuit in wiring or poor connection between climate control unit and driver-side air mix actuator
•  Open, short circuit in wiring or poor connection between climate control unit and passenger-side air mix actuator
•  Open, short circuit in wiring or poor connection between climate control unit and driver-side air mix actuator position sensor
•  Open, short circuit in wiring or poor connection between climate control unit and passenger-side air mix actuator position sensor
•  Climate control unit malfunction

•  When performing an asterisked (*) troubleshooting inspection, shake the wiring harness and connectors while doing the inspection to discover whether poor contact points are the cause of any intermittent malfunctions. If there is a problem, inspect to make sure connectors, terminals and wiring harness are connected correctly and undamaged.

Diagnostic procedure

STEP

INSPECTION

ACTION
1
CHECK SYMPTOM
•  Turn on the A/C.
•  Perform the dual A/C control function for driver and passenger side individually.
•  Is it either of cannot the temperature control on driver side or passenger side?
Yes
Go to the next step.
No
Go to Step 12.
2
INSPECT TO SEE WHETHER MALFUNCTION IS IN AIR MIX DOOR OR ELSEWHERE
•  Turn on the A/C.
•  Change temperature control for suspect side seat at the dual mode.
•  Does the suspect side air mix door move smoothly?
Yes
Go to Step 8.
No
Go to the next step.
3
INSPECT AIR MIX ACTUATOR
•  Inspect the suspect side air mix actuator.
•  Is the air mix actuator normal?
Yes
Go to the next step.
No
Replace the suspect air mix actuator, then go to Step 15.
4*
INSPECT AIR MIX ACTUATOR (MOTOR) CIRCUIT FOR SHORT TO GROUND
•  Disconnect the climate control unit connector.
•  Inspect for continuity between the following terminals (wiring harness-side) and body ground:
L.H.D.
―  Climate control unit terminal 2E (driver-side motor)
―  Climate control unit terminal 2G (driver-side motor)
―  Climate control unit terminal 2F (passenger-side motor)
―  Climate control unit terminal 2H (passenger-side motor)
R.H.D.
―  Climate control unit terminal 2F (driver-side motor)
―  Climate control unit terminal 2H (driver-side motor)
―  Climate control unit terminal 2E (passenger-side motor)
―  Climate control unit terminal 2G (passenger-side motor)
•  Is there continuity?
Yes
Repair or replace the wiring harness for a possible short to ground, then go to the Step 15.
No
Go to the next step.
5*
INSPECT AIR MIX ACTUATOR (MOTOR) CIRCUIT FOR OPEN CIRCUIT
•  Air mix actuator and climate control unit connectors are disconnected.
•  Inspect for continuity between the following terminals (wiring harness-side):
L.H.D.
―  Climate control unit terminal 2E— driver-side air mix actuator terminal B
―  Climate control unit terminal 2G — driver-side air mix actuator terminal C
―  Climate control unit terminal 2F— passenger-side air mix actuator terminal C
―  Climate control unit terminal 2H — passenger-side air mix actuator terminal B
R.H.D.
―  Climate control unit terminal 2F — driver-side air mix actuator terminal C
―  Climate control unit terminal 2H — driver-side air mix actuator terminal B
―  Climate control unit terminal 2E — passenger-side air mix actuator terminal B
―  Climate control unit terminal 2G— passenger-side air mix actuator terminal C
•  Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness for a possible open circuit, then go to Step 15.
6*
INSPECT AIR MIX ACTUATOR (MOTOR) CIRCUIT FOR SHORT TO POWER SUPPLY
•  Air mix actuator and climate control unit connectors are disconnected.
•  Connect the negative battery cable.
•  Switch the ignition ON (engine off or on).
•  Measure the voltage at the following terminals (wiring harness-side):
L.H.D.
―  Climate control unit terminal 2E (driver-side motor)
―  Climate control unit terminal 2G (driver-side motor)
―  Climate control unit terminal 2F (passenger-side motor)
―  Climate control unit terminal 2H (passenger-side motor)
R.H.D.
―  Climate control unit terminal 2F (driver-side motor)
―  Climate control unit terminal 2H (driver-side motor)
―  Climate control unit terminal 2E (passenger-side motor)
―  Climate control unit terminal 2G (passenger-side motor)
•  Is the voltage 0 V?
Yes
Go to the next step.
No
Repair or replace the wiring harness for a possible short to power supply, then go to Step 15.
7
INSPECT AIR MIX DOOR
•  Inspect the suspect side air mix door.
―  Is the fan free of interfere with the suspect side A/C unit case?
―  Is the fan free of foreign material and obstruction?
•  Is the air mix door normal?
Yes
Replace the climate control unit, then go to Step 15.
(See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)
No
Remove the obstruction or replace the suspect side A/C unit case, then go to Step 15.
8*
INSPECT AIR MIX ACTUATOR POSITION SENSOR
•  Inspect the suspect side air mix actuator position sensor.
•  Is the air mix actuator position sensor normal?
Yes
Go to the next step.
No
Replace the suspect air mix actuator, then go to Step 15.
9*
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:
L.H.D.
―  Climate control unit terminal 1P (driver-side position sensor)
―  Climate control unit terminal 1R (passenger-side position sensor)
―  Climate control unit terminal 1L (position sensor power supply)
―  Climate control unit terminal 1W (position sensor ground)
R.H.D.
―  Climate control unit terminal 1R (driver-side position sensor)
―  Climate control unit terminal 1P (passenger-side position sensor)
―  Climate control unit terminal 1L (position sensor power supply)
―  Climate control unit terminal 1W (position sensor ground)
•  Is there continuity?
Yes
Repair or replace the wiring harness for a possible short to ground, then go to the Step 15.
No
Go to the next step.
10*
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):
L.H.D.
―  Climate control unit terminal 1P — driver-side air mix actuator terminal F
―  Climate control unit terminal 1R — passenger-side air mix actuator terminal F
―  Climate control unit terminal 1L — driver-side air mix actuator terminal G
―  Climate control unit terminal 1L — passenger-side air mix actuator terminal E
―  Climate control unit terminal 1W — driver-side air mix actuator terminal E
―  Climate control unit terminal 1W— passenger-side air mix actuator terminal G
R.H.D.
―  Climate control unit terminal 1R — driver-side air mix actuator terminal F
―  Climate control unit terminal 1P — passenger-side air mix actuator terminal F
―  Climate control unit terminal 1L — driver-side air mix actuator terminal E
―  Climate control unit terminal 1L — passenger-side air mix actuator terminal G
―  Climate control unit terminal 1W — driver-side air mix actuator terminal G
―  Climate control unit terminal 1W — passenger-side air mix actuator terminal E
•  Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness for a possible open circuit, then go to Step 15.
11*
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 cable.
•  Switch the ignition ON (engine off or on).
•  Measure the voltage at the following terminals (wiring harness-side):
L.H.D.
―  Climate control unit terminal 1P (driver-side position sensor)
―  Climate control unit terminal 1R (passenger-side position sensor)
―  Climate control unit terminal 1L (position sensor power supply)
―  Climate control unit terminal 1W (position sensor ground)
R.H.D.
―  Climate control unit terminal 1R (driver-side position sensor)
―  Climate control unit terminal 1P (passenger-side position sensor)
―  Climate control unit terminal 1L (position sensor power supply)
―  Climate control unit terminal 1W (position sensor ground)
•  Is the voltage 0 V?
Yes
Go to the next step.
No
Repair or replace the wiring harness for a possible short to power supply, then go to Step 15.
12*
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:
―  Climate control unit terminal 1L(position sensor power supply)
―  Climate control unit terminal 1W (position sensor ground)
•  Is there continuity?
Yes
Repair or replace the wiring harness for a possible short to ground, then go to the Step 15.
No
Go to the next step.
13*
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):
L.H.D.
―  Climate control unit terminal 1L — driver-side air mix actuator terminal G
―  Climate control unit terminal 1L— passenger-side air mix actuator terminal E
―  Climate control unit terminal 1W — driver-side air mix actuator terminal E
―  Climate control unit terminal 1W — passenger-side air mix actuator terminal G
R.H.D.
―  Climate control unit terminal 1L — driver-side air mix actuator terminal E
―  Climate control unit terminal 1L — passenger-side air mix actuator terminal G
―  Climate control unit terminal 1W — driver-side air mix actuator terminal G
―  Climate control unit terminal 1W — passenger-side air mix actuator terminal E
•  Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness for a possible open circuit, then go to Step 15.
14*
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 cable.
•  Switch the ignition ON (engine off or on).
•  Measure the voltage at the following terminals (wiring harness-side):
―  Climate control unit terminal 1L (position sensor power supply)
―  Climate control unit terminal 1W (position sensor ground)
•  Is the voltage 0 V?
Yes
Go to the next step.
No
Repair or replace the wiring harness for a possible short to power supply, then go to the next step.
15
CONFIRM THAT MALFUNCTION SYMPTOMS DOES NOT RECUR AFTER REPAIR
•  Does the temperature adjust individually for driver seat and passenger seat?
Yes
Troubleshooting completed. Explain repairs to customer.
No
Recheck malfunction symptoms, then repeat from Step 1 if malfunction recurs.