SKperformance Posted August 31, 2003 Share Posted August 31, 2003 TROUBLE SHOOTING SELF-DIAGNOSTICS An Electronic Control Unit (ECU) within A/C-heater control panel monitors system circuits and stores trouble codes in memory if problems are detected. All codes, except Codes 22 and 23, are stored in memory. Malfunction is current if Code 22 or 23 is displayed. To retrieve stored codes, see RETRIEVING CODES. Codes are displayed at temperature display. See Fig. 2. RETRIEVING CODES 1) Simultaneously press and hold AUTO and recirculated air switches. See Fig. 2. Turn ignition on. All indicators will flash 4 times, at one-second intervals. Tone will sound when indicators flash. 2) A/C system will enter self-diagnostic mode. To end indicator check, press and release OFF switch. Read codes at temperature display. 3) If trouble code is displayed, proceed to appropriate trouble shooting procedure. See DIAGNOSTIC CODE IDENTIFICATION table. Codes are displayed in ascending order. To slow rate at which codes are displayed, press fresh air button to change display to step operation. Each time fresh air button is pressed, display changes by one step. 4) If tone sounds as code is displayed, problem currently exists. If tone does not sound as code is displayed, problem occurred in past and does not presently exist. Code Diagnosis 00 ................................................ Normal 11 (1) ............. In-Vehicle Temperature Sensor Circuit 12 (2) ................ Ambient Temperature Sensor Circuit 13 ................. Evaporator Temperature Sensor Circuit 14 .................... Coolant Temperature Sensor Circuit 21 (3) .............................. Solar Sensor Circuit 22 (4) .................... Compressor Lock Sensor Circuit 23 (4) ........................... Pressure Switch Circuit 31 .................. Air Mix Door Position Sensor Circuit 32 ................ Air Inlet Door Position Sensor Circuit 33 ............... Air Outlet Door Position Sensor Circuit 41 ....................... Air Mix Door Servomotor Circuit 42 ..................... Air Inlet Door Servomotor Circuit 43 .................... Air Outlet Door Servomotor Circuit (1) - If in-vehicle temperature is -4 F (-20 C) or less, Code 11 may set even though system is normal. (2) - If outside air temperature is -58 F (-50 C) or less, Code 12 may occur set though system is normal. (3) - If testing is done in a dark area, Code 21 may set even though system is normal. Shine a light at solar sensor and recheck codes. (4) - Malfunction is current. Code is not stored in memory. ACTUATOR CHECK 1) Perform step 1) of RETRIEVING CODES. When system enters self-diagnostic mode, press recirculated air button. Each mode door, motor, and relay will operate at one-second intervals. Press fresh air button to display codes one at a time, and perform step-by-step actuator check. 2) Check airflow and temperature by hand. Tone will sound each time display code changes. Each display code is associated with a system operating condition. See Fig. 3 or 4. Press OFF button to cancel actuator check mode. 1 Quote Link to comment Share on other sites More sharing options...
eskaeone Posted August 22, 2006 Share Posted August 22, 2006 this is only for cars 95 and older, before OBD.. Quote Link to comment Share on other sites More sharing options...
pingpong Posted February 4, 2007 Share Posted February 4, 2007 hello im new to the forum and ide like to say hi and thanks to this forum because it has been very helpfull! anyways. i have a 92 SC400 that i got for free from my uncle.. sadly to say it wasnt well maintaned so my borther and i did everything to make it work much better. i just checked my AC thing and the numbers that came out were.. 11 21 23 41 41 had no beep. what does this mean? Quote Link to comment Share on other sites More sharing options...
jgis19 Posted February 7, 2007 Share Posted February 7, 2007 How would I reset the A/C filter needs changing that flashes when starting engine? The A/C filter has been changed. Thanks Quote Link to comment Share on other sites More sharing options...
George_Jetson Posted March 27, 2010 Share Posted March 27, 2010 Press and hold the front AC OFF button for 4 seconds. The AC filter RESET should appear on the multifuntion information display. Quote Link to comment Share on other sites More sharing options...
VBdenny Posted July 2, 2010 Share Posted July 2, 2010 this is only for cars 95 and older, before OBD.. Before OBDII Quote Link to comment Share on other sites More sharing options...
OkieRocket Posted July 17, 2013 Share Posted July 17, 2013 OBDII? Quote Link to comment Share on other sites More sharing options...
superdanno Posted August 1, 2018 Share Posted August 1, 2018 WILL THIS PROCEEDURE WORK FOR MY SC400-1994 Quote Link to comment Share on other sites More sharing options...
mailman953 Posted March 26, 2019 Share Posted March 26, 2019 AWESOME, THANK YOU, THE MORE I READ ON THE LEXUS, THE MORE IMPRESSED I AM BECOMING. Quote Link to comment Share on other sites More sharing options...
theboz86 Posted October 24, 2020 Share Posted October 24, 2020 great info, thank you! Quote Link to comment Share on other sites More sharing options...
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