How to Use the Climate Control Unit Self-Diagnostic Function Without the HDS

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2017 Honda Odyssey, 2016 Honda Odyssey, 2015 Honda Odyssey, 2014 Honda Odyssey, and 2013 Honda Odyssey. However, it is still accessible from the selected car via links, so may be relevant.

The climate control unit has a self-diagnostic function. To run the self-diagnostic function, do the following:

Turn the ignition switch to LOCK (0), and then back to ON (II).
Press and hold the ON/OFF button, then press the REAR WINDOW DEFOGGER/MIRROR DEFOGGER button five times within 10 seconds. Release the ON/OFF button and the REAR WINDOW DEFOGGER/MIRROR DEFOGGER button; then the self-diagnosis begins.
NOTE:
- The blower motor should run at various speeds regardless of what the panel is displaying.
- If there is a problem with the system, it will flash AUTO, 88 and AUTO, 88 and WINDSHIELD DEFROST, or 88 and MODE, and one or more of the 14 indicator segments (A through N). Refer to CHECKING FOR DTCS .
- If there are no problems detected, the segments will not illuminate, and the system will appear to be turned off.
  
  Fig 1: Climate Control Unit Components Location
  Courtesy of AMERICAN HONDA MOTOR CO., INC.
Canceling the Self-Diagnostic Function
Turn the ignition switch to LOCK (0), to cancel the self-diagnostic function. After completing the repair work, run the self-diagnostic function again to make sure that there are no other DTCs.