Dual Automatic Temperature Control (DATC) Unit

Components and Component Location

Component

Connector Terminal Function

Repair Procedures

Self-Diagnosis

1. 1
   Self-Diagnosis Procedure.

   

   When operating self-diagnosis, the malfunction below (self-diagnosis code) will flash at 0.5 second intervals on the temperature display of the display settings (driver side only), and the other symbols are off.

2. 2
   Trouble Code Display

   1. Continuous Operation: DTC.

      

   2. Continuous Operation: DTC.

      

   3. STEP operation. A. Normal code or one trouble code is the same as continuous operation. B. Trouble code.

      

3. 3

   Display	Description of Malfunction	Notes
   0	Normal
   11	Incar Temperature Sensor Open (OPEN, INCAR F/B Voltage ≥ 4.9 V)
   12	Incar Temperature Sensor Short (SHORT, INCAR F/B Voltage ≤ 0.1 V)
   13	Ambient Temperature Sensor Open (OPEN, AMBIENT F/B Voltage ≥ 4.9 V)
   14	Ambient Temperature Sensor Short (SHORT, AMBIENT F/B Voltage ≤ 0.1 V)
   17	Evaporator Temperature Sensor Open (OPEN, EVAP F/B Voltage ≥ 4.9 V)
   18	Evaporator Temperature Sensor Short (SHORT, EVAP F/B Voltage ≤ 0.1 V)
   19	Driver Seat Temperature Control Actuator Open/Short Circuit (OPEN/SHORT) SHORT range [TEMP F/B Voltage ≤ 0.1 V] OPEN range [TEMP F/B Voltage ≥ 4.9 V]
   20	Driver Seat Temperature Control Actuator Motor Restriction (Note: if both the target range and the restriction range fall within MAX COOL range [0.1 V < TEMP F/B Voltage ≤ 0.5 V] and MAX WARM range [4.5 V ≤ TEMP F/B Voltage < 4.9 V], error code 20 is not displayed because there are no further restrictions. This prevents MAX WARM and MAX COOL from displaying code 20 due to the allowable tolerance of the actuator and FATC.)	If the actuator cannot reach the required control position within 10 seconds, it is considered restricted.
   21	Driver Seat Mode Actuator Feedback Open/Short Circuit SHORT range [DR MODE F/B Voltage ≤ 0.1 V] OPEN range [DR MODE F/B Voltage ≥ 4.9 V]
   22	Driver Seat Mode Actuator Motor Restriction (Note: if both the target range and the restriction range fall within VENT range [0.1 V < DR MODE F/B Voltage ≤ 0.5 V] and DEF range [4.5 V ≤ DR MODE F/B Voltage < 4.9 V], error code 22 is not displayed because there are no further restrictions. This prevents VENT and DEF from displaying code 22 due to the allowable tolerance of the actuator and FATC.)	If the actuator cannot reach the required control position within 10 seconds, it is considered restricted.
   25	Intake/Recirculation Air Door Actuator Position Sensor Open/Short Circuit SHORT range [INTAKE F/B Voltage ≤ 0.1 V] OPEN range [INTAKE F/B Voltage ≥ 4.9 V]
   26	Intake/Recirculation Air Door Actuator Motor Restriction (Note: if both the target range and the restriction range fall within FRE range [0.1 V < INTAKE F/B Voltage ≤ 0.5 V] and REC range [4.5 V ≤ INTAKE F/B Voltage < 4.9 V], error code 26 is not displayed because there are no further restrictions. This prevents FRE and REC from displaying code 26 due to the allowable tolerance of the actuator and FATC.)
   32	Passenger Seat Temperature Control Actuator Open/Short Circuit (OPEN/SHORT) SHORT range [TEMP F/B Voltage ≤ 0.1 V] OPEN range [TEMP F/B Voltage ≥ 4.9 V]
   33	Passenger Seat Temperature Control Actuator Motor Restriction (Note: if both the target range and the restriction range fall within MAX COOL range [0.1 V < TEMP F/B Voltage ≤ 0.5 V] and MAX WARM range [4.5 V ≤ TEMP F/B Voltage < 4.9 V], error code 20 is not displayed because there are no further restrictions. This prevents MAX WARM and MAX COOL from displaying code 20 due to the allowable tolerance of the actuator and FATC.)	If the actuator cannot reach the required control position within 10 seconds, it is considered restricted.
   45	APT CAN signal error
   47	RPM CAN Signal Error
   48	CAN Vehicle Speed Signal Error
   49	Engine coolant temperature CAN signal error

4. 4
   FAIL-SAFE

   NO	SIGNAL / ITEM	Failure Criteria	Substitute Value on Failure	Notes
   1	AMB SENSOR	OPEN/SHORT	"--" is displayed on the screen. Alternative control until 20 °C
   2	INCAR SENSOR	OPEN/SHORT	Fixed at 25 °C
   3	EVA SENSOR	OPEN/SHORT	Fixed at -2°C
   4	TEMPERATURE DOOR POTENTIOMETER	OPEN/SHORT	If the temperature is set to 22 °C or lower, move to the COOL position and fix it there. If the temperature is set to 22 °C or higher, move to the WARM position and fix it there.
   5	MODE DOOR POTENTIOMETER	OPEN/SHORT	Move to the VENT position and fix it there if VENT mode is on. Correct the movement of the DEF position if it is not in VENT mode.
   6	INTAKE DOOR POTENTIOMETER	OPEN/SHORT	To select FRE, move to the FRE position and fix it there. For REC, move to the REC position and fix it there.
   7	VS (Vehicle Speed)	FFh or signal not received	1. Take alternative control based on VS_TCU (from TCU2). 2. When both VS and VS_TCU are in FFh state or not received, process vehicle speed as FAIL (alternative control 0 km/h).
   8	VS_TCU (Vehicle speed calculated by TCU)	FFh or signal not received	1. Take alternative control based on VS_TCU (from TCU2). 2. When both VS and VS_TCU are in FFh state or not received, process vehicle speed as FAIL (alternative control 0 km/h).
   9	N (Engine Speed)	No signal received	Fixed at 650 rpm
   10	F_N_ENG (Engine Speed Signal Error)	01h or no signal received	Fixed at 650 rpm
   11	TPS (Throttle Position Sensor Signal)	FFh or signal not received	Fixed at 0%
   12	TEMP_ENG (Engine Coolant Temperature)	FFh or signal not received	Fixed at 90 °C (including calculated torque calculation)
   13	R_TqAcnApvC (A/C Compressor Maximum Torque Limit)	FFh or signal not received	Fixed at 0 N·m
   14	R_PAcnC (APT Sensor Output Value)	FFh or signal not received	Fixed at 0 hPa
   15	R_NEngIdlTgC (Engine Idle Target Speed)	FFh or signal not received	Use the replacement table
   16	SUNROOF ON/OFF (C_SunRoofOpenState)	No signal received	Process the signal to C_SunRoofOpenState=0H (SUNROOF lock). Logic does not operate.)

Replacement

When removing with a flat-blade screwdriver or puller, wrap the tool with protective tape to prevent damage to the components. Wear gloves to avoid cutting your hands.

Be careful not to bend or scratch the trim and panels.

1. 1
   Disconnect the negative (-) battery terminal.
2. 2
   Using a flat-tip screwdriver or a remover, remove the console upper cover (A).

   

3. 3
   Press the lock pin and disconnect the various connectors (A).

   

4. 4
   Loosen the mounting screws and remove the heater and A/C control unit (A).

   

5. 5
   To install, reverse the removal procedure.

   Replace any damaged clips (or pin-type retainers). Make sure the connector is properly connected.