How to Troubleshoot the Climate Control

Checking for DTCs
The temperature display indicates single or multiple DTCs. If indicator segments A, C, E, and G 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.
DTC (Driver's Temperature Indicator Segment and AUTO Indicator)
Detection Item
A
An open in the in-car temperature sensor circuit
B
A short in the in-car temperature sensor circuit
C
An open in the outside air temperature sensor circuit
D
A short in the outside air temperature sensor circuit
E
An open in the sunlight sensor circuit
F
A short in the sunlight sensor circuit
G
An open in the evaporator temperature sensor circuit
H
A short in the evaporator temperature sensor circuit
J
A problem in the driver's air mix control linkage, door, or motor
K
A problem in the passenger's air mix control linkage, door, or motor
L
A problem in the mode control linkage, doors, or motor
M
A problem in the recirculation control linkage, door, or motor
N
A problem in the blower motor
P
Climate control unit internal error
A and AUTO
Climate control unit lost communication with gauge control module (TACH) (NE message)
B and AUTO
Climate control unit lost communication with gauge control module (TACH) (ECT message)
C and AUTO
Climate control unit lost communication with recirculation control motor
D and AUTO
Climate control unit lost communication with mode control motor
E and AUTO
Climate control unit lost communication with gauge control module (TACH) (VSP message)
G and AUTO
Driver's air mix control motor failure
H and AUTO
Passenger's air mix control motor failure
J and AUTO
Communication bus line error
K and AUTO
Climate control unit lost communication with each control motor
L and AUTO
Climate control unit lost communication with driver's air mix control motor
M and AUTO
Climate control unit lost communication with passenger's air mix control motor
N and AUTO
Mode control motor failure
P and AUTO
Recirculation control motor failure