Self-Diagnosis of Heater and A/C Control Unit (DATC)

Self-Diagnosis Procedure

How to Read Self-Diagnosis Code: After the display panel flashes three times every 0.5 seconds, the corresponding trouble code flashes on the temperature setting display panel every 0.5 seconds and shows two digits. Codes are displayed in numeric format Trouble Code

Display	Fault Description
00	Normal
11	Interior Temperature Sensor Short Circuit (Low)
12	Interior Temperature Sensor Open Circuit (High)
13	Ambient Temperature Sensor Short Circuit (Low)
14	Ambient Temperature Sensor Open Circuit (High)
17	Evaporator Sensor Short Circuit (Low)
18	Evaporator Sensor Open Circuit (High)
19	Air Mix Potentiometer Open (Low) - Driver
	Air Mix Potentiometer Short (High) - Driver
21	Direction Potentiometer Open (Low) - Driver
	Direction Potentiometer Short (High) - Driver
20	Air Mix Motor - Driver
22	Direction Control Motor - Driver
25	Intake Potentiometer Open (Low)
	Intake Potentiometer Short (High)
26	Intake Motor
32	Air Mix Potentiometer Open (Low) - Passenger
	Air Mix Potentiometer Short (High) - Passenger
33	Air Mix Motor - Passenger
44	Cluster ionizer malfunction
31	Automatic Anti-Fog Sensor Signal and Glass Sensor Input Malfunction
40	DEF Direction Potentiometer Open (Low)
	DEF Direction Potentiometer Short (High)
41	DEF Direction Control Motor
46	APT Sensor Malfunction (CAN Signal)
47	Engine Speed Error (CAN Signal)
48	Vehicle Speed Sensor Malfunction (CAN Signal)
49	Engine Coolant Temperature Sensor Malfunction (CAN Signal)

Trouble Code Display

1. Continuous Operation: No DTC or One DTC.

   

2. Continuous Operation: Two or More DTCs.

   

3. STEP Operation

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

   B.	Two or more DTCs.

   

If trouble codes are displayed during inspection, check for the cause by referring to the trouble code chart.

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 - Driver	< 0.1 V or > 4.9 V	Set temperature 24 °C or lower Set temperature 25 °C or higher: Max Hot
5	Mode Control Actuator Feedback - Driver	< 0.1 V or > 4.9 V	Vent: Vent Others: Anti-Fog
6	Intake Actuator Feedback	< 0.1 V or > 4.9 V	Recirculation: Recirculation Other: Fresh
7	Temperature Control Actuator Feedback - Passenger	< 0.1 V or > 4.9 V	Set temperature 24 °C or lower Set temperature 25 °C or higher: Max Hot
8	Automatic Anti-Fog Sensor (Relative Humidity)	Communication Error	Relative Humidity: 60%, Ambient Temperature: 23 °C
9	Automatic Anti-Fog Actuator Feedback	< 0.1 V or > 4.9 V	Close: Close Others: Open