FixVault

Checking for DTCs

WARNING: This page is about a different car, the 2009 Acura MDX, 2008 Acura MDX, and 2007 Acura MDX. However, it is still accessible from the selected car via links, so may be relevant.

The temperature display indicates single or multiple DTCs. If indicator segments A, B, C, E, G, J, M, N, AUTO, and WINDSHIELD DEFROST are on at the same time, there may be an open in the common ground wire. If no DTCs are present, the indicator remains blank.

Fig 1: Identifying A/C Control Panel
G05487537Courtesy of AMERICAN HONDA MOTOR CO., INC.
DTC (DRIVER'S TEMPERATURE INDICATOR SEGMENT, AUTO, AND WINDSHIELD DEFROST INDICATOR) CHART

DTC (Driver's Temperature Indicator Segment, AUTO, and WINDSHIELD DEFROST Indicator) Detection Item
A and AUTO An open in the in-car temperature sensor circuit (see DTC B1225 or DTC indicator A and AUTO: An Open in the In-car Temperature Sensor Circuit  )
B and AUTO A short in the in-car temperature sensor circuit (see DTC B1226 or DTC indicator B and AUTO: A Short in the In-car Temperature Sensor Circuit  )
C and AUTO An open in the outside air temperature sensor circuit (see DTC B1227 or DTC indicator C and AUTO: An Open in the Outside Air Temperature Sensor Circuit  )
D and AUTO A short in the outside air temperature sensor circuit (see DTC B1228 or DTC indicator D and AUTO: A Short in the Outside Air Temperature Sensor Circuit  )
E and AUTO An open in the sunlight sensor circuit (see DTC B1229 or DTC indicator E and AUTO: An Open in the Sunlight Sensor Circuit  )
F and AUTO A short in the sunlight sensor circuit (see DTC B1230 or DTC indicator F and AUTO: A Short in the Sunlight Sensor Circuit  )
G and AUTO An open in the front evaporator temperature sensor circuit (see DTC B1231 or DTC indicator G and AUTO: An Open in the Front Evaporator Temperature Sensor Circuit  )
Hand AUTO A short in the front evaporator temperature sensor circuit (see DTC B1232 or DTC indicator H and AUTO: A Short in the Front Evaporator Temperature Sensor Circuit  )
J and AUTO An open in the driver's air mix control motor circuit (see DTC B1233 or DTC indicator J and AUTO: An Open in the Driver's Air Mix Control Motor Circuit  )
K and AUTO A short in the driver's air mix control motor circuit (see DTC B1234 or DTC indicator K and AUTO: A Short in the Driver's Air Mix Control Motor Circuit  )
L and AUTO A problem in the driver's air mix control linkage, door, or motor circuit (see DTC B1235 or DTC indicator L and AUTO: A Problem in the Driver's Air Mix Control Linkage, Door, or Motor Circuit  )
M and AUTO An open in the passenger's air mix control motor circuit (see DTC B1236 or DTC indicator M and AUTO: An Open in the Passenger's Air Mix Control Motor Circuit  )
N and AUTO A short in the passenger's air mix control motor circuit (see DTC B1237 or DTC indicator N and AUTO: A Short in the Passenger's Air Mix Control Motor Circuit  )
P and AUTO A problem in the passenger's air mix control linkage, door, or motor circuit (see DTC B1238 or DTC indicator P and AUTO: A Problem in the Passenger's Air Mix Control Linkage, Door, or Motor Circuit  )
AUTO Climate control unit lost communication with gauge control module (ECT message) (see DTC B1205: Climate Control Unit Lost Communication with Gauge Control Module (VSP/NE message); DTC B1206 or DTC indicator AUTO: Climate Control Unit Lost Communication with Gauge Control Module (ECT message); DTC B1207: Climate Control Unit Lost Communication with Gauge Control Module (ILLUMI message)  )
A An open or short in the front mode control motor circuit (see DTC B1239 or DTC indicator A: An Open or Short in the Front Mode Control Motor Circuit  )
B A problem in the front mode control linkage, doors, or motor circuit (see DTC B1240 or DTC indicator B: A Problem in the Front Mode Control Linkage, Doors, or Motor Circuit  )
C A problem in the front blower motor circuit (see DTC B1241 or DTC indicator C: A Problem in the Front Blower Motor Circuit  )
F An open in the rear air mix control motor circuit (see DTC B1244 or DTC indicator F: An Open in the Rear Air Mix Control Motor Circuit  )
G A short in the rear air mix control motor circuit (see DTC B1245 or DTC indicator G: A Short in the Rear Air Mix Control Motor Circuit  )
H A problem in the rear air mix control linkage, door, or motor circuit (see DTC B1246 or DTC indicator H: A Problem in the Rear Air Mix Control Linkage, Door, or Motor Circuit  )
J An open or short in the recirculation control motor circuit (see DTC B1215 or DTC indicator J: An Open or Short in the Recirculation Control Motor Circuit  )
K A problem in the recirculation control linkage, door, or motor circuit (see DTC B2983 or DTC indicator K: A problem in the Recirculation Control Linkage, Door, or Motor Circuit  )
M A problem in the rear blower motor circuit (see DTC B1223 or DTC indicator M: A Problem in the Rear Blower Motor Circuit  )
N An open in the rear evaporator temperature sensor circuit (see DTC B1213 or DTC indicator N: An Open in the Rear Evaporator Temperature Sensor Circuit  )
P A short in the rear evaporator temperature sensor circuit (see DTC B1214 or DTC indicator P: A Short in the Rear Evaporator Temperature Sensor Circuit  )
A and WINDSHIELD DEFROST An open in the humidity sensor circuit (see DTC B2967 or DTC indicator A and WINDSHIELD DEFROST: An Open in the Humidity Sensor Circuit  ), a short in the humidity sensor circuit (see DTC B2968 or DTC indicator A and WINDSHIELD DEFROST: A Short in the Humidity Sensor Circuit  )
Band WINDSHIELD DEFROST An open in the A/C pressure sensor circuit (see DTC B2979 or DTC indicator B and WINDSHIELD DEFROST: An Open in the A/C Pressure Sensor Circuit  ), a short in the A/C pressure sensor circuit (see DTC B2980 or DTC indicator B and WINDSHIELD DEFROST: A short in the A/C Pressure Sensor Circuit  )