tpete

SKPerformance--Thanks for your response. I followed the procedure as outlined in your 6/11/2003 FAQ post. The code 21 now makes sense as I performed the test (pushing AUTO and recirculation buttons while turning key into the "ON" position) inside the garage with very little light. I suspect there is an electrical short/disruption in the climate control system that is causing it to flake out. An annoyance I have lived with for over 2 years.

I have a 1996 ES 300 whose climate control periodically "defaults" to 75 degrees regardless of the temperature desired. This can happen at any time and usually lasts about 10-15 minutes before it resets itself back to the requested setting. I performed a self-diagnostic test and came back with a code 21. Any idea as to what this code means?