Climate Control System

WARNING: This page is about a different car, the 2008 Honda Pilot, 2007 Honda Pilot, and 2006 Honda Pilot. However, it is still accessible from the selected car via links, so may be relevant.

How to Retrieve a Diagnostic Trouble Codes

The climate control unit has a self-diagnostic function.

Running the Self-diagnostic Function

Turn the ignition switch ON (II).
Set the driver's temperature control dial on MAX cool.
Press and hold the AUTO button.
While holding the AUTO button, press and hold the OFF button. The self-diagnosis begins.

Fig 1: Identifying AUTO Button & OFF Button
Courtesy of AMERICAN HONDA MOTOR CO., INC.

If there is any abnormality in the system, the temperature indicator will light up the segment (A through N) corresponding to the error. If no DTCs are found, go to SYMPTOM TROUBLESHOOTING INDEX . The temperature indicator will then alternate every second between displaying "88" (all segments lit) and the error code segment (A through N).

NOTE: The system will only display the DTC when the AUTO and OFF buttons are pressed. If you release the buttons, the display will go blank. To return the display, simply press the AUTO then the OFF buttons again.

To determine the meaning of the DTC, refer to the DTC troubleshooting index. If there is no abnormality, the segments will not light up.

NOTE: If there are no DTCs detected (no opens or shorts in the climate control circuits or sensors), and the system is still not operating properly, check the sensor input to the climate control unit.

Fig 2: Identifying Temperature Indicator
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Cancelling the Self-diagnostic Function

Turn the ignition switch OFF to cancel the self-diagnostic function. After completing repair work, run the self-diagnostic function again to make sure that there are no other malfunctions.

To retrieve the DTC, you must run the self-diagnostic function. In the case of multiple problems, the respective indicator segments will come on. If indicator segments A, C, E, G, I, and L come on at the same time, there may be an open in the common ground wire of the sensors.

Fig 1: Identifying Temperature Indicator

Courtesy of AMERICAN HONDA MOTOR CO., INC.

DETECTION ITEMS AND REFERENCE

DTC (Temperature Indicator Segment)	Detection Item	Reference
A	An open in the in-car temperature sensor circuit	(see DTC Indicator A: An Open In The In-Car Temperature Sensor Circuit )
B	A short in the in-car temperature sensor circuit	(see DTC indicator B: A Short in the In-car Temperature Sensor Circuit )
C	An open in the outside air temperature sensor circuit	(see DTC indicator C: An Open in the Outside Air Temperature Sensor Circuit )
D	A short in the outside air temperature sensor circuit	(see DTC indicator D: A Short in the Outside Air Temperature Sensor Circuit )
E	An open in the sunlight sensor circuit	(see DTC Indicator E: An Open In The Sunlight Sensor Circuit )
F	A short in the sunlight sensor circuit	(see DTC indicator F: A Short in the Sunlight Sensor Circuit )
G	An open in the evaporator temperature sensor circuit	(see DTC Indicator G: An Open in the Evaporator Temperature Sensor Circuit )
H	A short in the evaporator temperature sensor circuit	(see DTC Indicator H: A Short in the Evaporator Temperature Sensor Circuit )
I	An open in the air mix control motor circuit	(see DTC Indicator I: An Open in the Air Mix Control Motor Circuit )
J	A short in the air mix control motor circuit	(see DTC Indicator J: A Short in the Air Mix Control Motor Circuit )
K	A problem in the air mix control linkage, door, or motor	(see DTC Indicator K: A Problem in the Air Mix Control Linkage, Door, or Motor )
L	An open or short in the mode control motor circuit	(see DTC Indicator L: An Open or Short in the Mode Control Motor Circuit )
M	A problem in the mode control linkage, doors, or motor	(see DTC indicator M: A Problem in the Mode Control Linkage, Doors, or Motor )
N	A problem in the blower motor circuit	(see DTC Indicator N: A Problem in the Blower Motor Circuit )