How to Use the 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 OFF button. While pressing the REAR WINDOW DEFOGGER/MIRROR HEATER button five times within 10 seconds, then release the OFF button and the self-diagnostic will begin.
   NOTE:

   • The blower motor will run at various speeds regardless of what the panel is displaying.
   • If there is a problem with the system, it will flash 88, or 88 AUTO or 88 A/C, 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 Switches

     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 repair work, run the self-diagnostic function again to make sure that there are no other DTCs.