Tyler121 Posted February 2, 2008 Share Posted February 2, 2008 I ran a diagnostic on the hvac system by pressing the auto button and the recirc button at the same time then turning the key to on, i did this and got the number 21, can someone tell me what the 21 means please Quote Link to comment Share on other sites More sharing options...
wwest Posted February 2, 2008 Share Posted February 2, 2008 Just guessing but if you didn't have a light shining on the sunlight radiation sensor the diagnostic will stop there showing it as a failure. Holding a shop light above it usually gets you past that "fault". Quote Link to comment Share on other sites More sharing options...
wwest Posted February 3, 2008 Share Posted February 3, 2008 From '92 LS400 shop/repair manual. Code 21 is the solar light sensor ciruit. 22 is "locked" compressor. 23-30 not used. 31 is open/short in the reheat/remix damper position sensor circuit. 32 is open/short in the air inlet (fresh/recirc.) damper position sensor circuit. 33 [a] open in reheat/remix damper position circuit, or... 33 open/short in reheat/remix damper servomotor circuit, or.... 33 [c] Remix/reheat servomotor "locked"/stalled. 34 [a] open in air inlet damper position sensor, or... 34 open/short in air inlet servomotor circuit, or... 34 [c] air inlet servomotor locked/stalled. Quote Link to comment Share on other sites More sharing options...
Tyler121 Posted February 3, 2008 Author Share Posted February 3, 2008 well i don't have a shop light but if i do it outside should it bypass 21? or do i need to go up to my neighbors and use his light Quote Link to comment Share on other sites More sharing options...
wwest Posted February 3, 2008 Share Posted February 3, 2008 well i don't have a shop light but if i do it outside should it bypass 21? or do i need to go up to my neighbors and use his light BRIGHT sunlight or flashlight.... What is your reason for testing...?? Quote Link to comment Share on other sites More sharing options...
Tyler121 Posted February 3, 2008 Author Share Posted February 3, 2008 well i tested again and i got 00, i didnt really have a reason for testing, i just was reading the Faq and saw that i could do that and wanted to test it. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.