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

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

1. Turn the ignition switch to LOCK (0) and then back to ON (II).
2. Press and hold the FAN ON/OFF button, then press the REAR WINDOW DEFOGGER/MIRROR DEFOGGER button five times within 10 seconds. Release the FAN ON/OFF and REAR WINDOW DEFOGGER/MIRROR DEFOGGER buttons; then the self-diagnostic begins.
   NOTE:

   • The blower motor should run at various speeds regardless of what the panel is displaying.
   • If there is a problem in the system, it will flash 88 and AUTO, 88 and WINDSHIELD DEFROST, or 88 and MODE, and one or more of the 14 indicator segments (A through P). 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: Identifying Climate Control Unit Indicators And Buttons

     Courtesy of AMERICAN HONDA MOTOR CO., INC.

   Canceling the Self-Diagnostic Function 

3. 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.