Honda 2004 Odyssey Service Manual page 1539

Heating/Air Conditioning
General Troubleshooting Information
How to Retrieve a DTC
The heater control panel has a self-diagnosis function. To run the self-diagnosis function, do the following:
1. Turn the ignition switch ON (II).
2. Turn the fan switch OFF.
3. Press the recirculation control button to select Recirculation (recirculation indicator comes on).
4. Press and hold the recirculation control button to select Fresh (recirculation indicator goes off). Continue to hold
the button until the recirculation indicator comes on for 2 seconds, and then goes off.
• If the system is OK, the recirculation indicator stays off.
• If any trouble is found, the recirculation indicator blinks the diagnostic trouble code (DTC) to indicate faulty
circuit or component.
Example of DTC Indicator Pattern (DTC 2):
Recirculation
indicator on
Recirculation
indicator off
Cancelling the Self-diagnosis Function
5. Turn the ignition switch OFF to cancel the self-diagnosis function. After completing repair work, run the self-
diagnosis function again to make sure that there are no other malfunctions.
21-8
RECIRCULATION INDICATOR
FAN SWITCH RECIRCULATION CONTROL BUTTON
Press and hold the
recirculation
control button
0.3 sec 0.3 sec
2 sec 1 sec
2 sec