Kia Rio YB Quiz
Heating, Ventilation, and Air Conditioning

Heater & A/C Control Unit (FATC)

In this manual: Heating, Ventilation, and Air Conditioning
General Information — 8Maintenance — 31Engine Mechanical System — 44Engine Electrical System — 14Emission Control System — 9Engine Control System/Fuel System — 30Clutch System — 10Manual Transmission — 10Automatic Transmission — 23Drive Shaft and Axle — 8Suspension System — 15Steering — 9Restraints — 14Brake System — 22Body (Interior and Exterior) — 115Body Electrical System — 84Heating, Ventilation, and Air Conditioning — 28
9steps
~54min
2/5difficulty
Done 0 of 9

Components and Component Location

Components

Connector Terminal Function

No. Connector A Connector B
1 Battery ⁻
2 ISG battery (+) ⁻
3 Illumination (+) ⁻
4 Sensor (REF) (+) Defrost Actuator Feedback
5 Mode Control Actuator Feedback Defrost Actuator (Open)
6 Temperature Control Actuator Feedback Anti-Fog Actuator (Close)
7 Intake Actuator Feedback ⁻
8 Evaporator Sensor (+) ⁻
9 Ambient Sensor (+) ⁻
10 Mode Control Actuator (VENT) ⁻
11 Mode Control Actuator (DEF) Defrost Current
12 Temperature Control Actuator (COOL) Anti-Fog Temperature
13 Temperature Control Actuator (WARM) Defrost
14 Intake Actuator (FRE) Anti-Fog Data
15 Intake Actuator (REC) ⁻
16 HTD Ground
17 Rear Heater Switch
18 ⁻
19 ⁻
20 Illumination (-)
21 IGN2
22 IGN1
23 Fan Motor (+)
24 Photo Sensor (-)
25 ⁻
26 ⁻
27 ⁻
28 PTC Relay 3
29 PTC Relay 2
30 PTC Signal
31 Latch Out (-)
32 ⁻
33 Chassis_CAN (High)
34 Chassis_CAN (Low)
35 FET (Drain Hose Feedback)
36 FET (Gate)
37 ECV (+)
38 ECV (-)
39 Sensor Ground
40 Ground

Circuit Diagrams

Schematic Diagrams

Repair Procedures

Self-Diagnosis

  1. Self-Diagnosis Procedure

  2. How to Read the Self-Diagnosis Code

    During self-diagnosis, the corresponding trouble code flashes on the display. The temperature setting display panel flashes every 0.5 seconds and shows two digits.

    Trouble codes are displayed in numeric format.

    Display Description of Malfunction
    00 Normal
    11 In-Car Sensor Open
    12 In-Car Sensor Short Circuit
    13 Ambient Temperature Sensor Open Circuit
    14 Ambient Temperature Sensor Short Circuit
    17 Evaporator Temperature Sensor Open Circuit
    18 Evaporator Temperature Sensor Short Circuit
    19 Temperature Door Potentiometer Open/Short
    20 Temperature Door Potentiometer Malfunction
    21 Mode Door Potentiometer Open/Short
    22 Mode Door Potentiometer Malfunction
    25 Intake Door Potentiometer Open/Short Circuit
    26 Intake Door Potentiometer Malfunction
    43 Foot Door Potentiometer Open/Short
    44 Foot Door Potentiometer Malfunction
    45 APT (A/C Pressure Transducer) CAN Signal Malfunction
    47 RPM CAN Signal Malfunction
    48 Vehicle Speed CAN Signal Malfunction
    49 Engine Coolant Temperature CAN Signal Malfunction
    50 Cluster ionizer malfunction
    51 Communication with the auto anti-fog sensor and sensor input malfunction

  3. Trouble Code Display

    1. Continuous operation: DTC is 0 or 1.

    2. Continuous operation: DTC is 2 or more.

    3. STEP Operation

      A.

      Normal code or one trouble code is the same as continuous operation.
      B.

      DTC is 2 or more.

  4. If trouble codes are displayed during inspection, check the causes of the malfunction using the trouble code table.

  5. Fail-safe

    No Sensor Failure Condition Fail-Safe Function
    1 Vehicle Sensor < 0.1 V or > 4.9 V 23°C (73.4°F)
    2 Ambient Temperature Sensor < 0.1 V or > 4.9 V 20°C (68°F)
    3 Evaporator Temperature Sensor < 0.1 V or > 4.9 V -2°C (28.4°F)
    4 Temperature Control Actuator Feedback < 0.1 V or > 4.9 V

    • Set temperature is 24 °C or lower: MAX COOL.

    • Set temperature is 25 °C or higher: Max. heating
    5 Mode Control Actuator Feedback < 0.5 V or > 4.5 V

    • Vent: Vent

    • Others: Anti-Fog
    6 Intake Actuator Feedback < 0.1 V or > 4.9 V

    • Recirculation: Recirculation

    • Other: Fresh
    7 Foot Actuator Feedback < 0.5 V or > 4.5 V

    • Vent: Open

    • Others: Close
    8 Anti-Fog Sensor
    (Relative Humidity)    		 Communication Error

    • Relative Humidity: 60%,

    • Ambient Temperature: 23 °C
    9 Automatic Defog Sensor
    (Glass Temperature)    		 < 0.1 V or > 4.9 V Glass Temperature: 23 °C
    10 Engine Coolant Temperature Communication Error 85°C (185°F)
    11 ECV Feedback No ECV input
    feedback signal

    • ECV Malfunction Signal: 1

    • PWM control output: Hold

    • Trade: 0

Replacement

  1. Disconnect the negative (-) battery terminal.

  2. Remove the heater and A/C controller (A) after loosening the mounting assembly.

  3. Disconnect the connectors (A) and the air hose (B).

  4. Installation is the reverse of removal.

Test yourself

A quick Kia Rio YB quiz: every answer comes with an explanation and a link to the manual page.