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Honda odyssey climate control diagnostic codes


Check Engine light codes are known as Diagnostic Trouble Codes or DTCs. As far as I can tell, there is no diagnostic connector for B-CAN, so I  3 Jun 2019 In this guide, you will learn how to read Honda fault codes with scanners a few models such as the Honda Odyssey or Honda Accord were prone P0141 ( Heated oxygen sensor 2, bank 1 heater control circuit malfunction). This is a service to repair/reset your air bag control module. How to fix U1286 engine diagnostic code For 2017 Honda Odyssey ? Starting letter U diagnostic code shows that there are problems in climate control system, lighting, airbags, etc. Codes between B1000 and B3000 are Manufacturer specific and may not match the ones listed here. Do the idle learn procedure: — Make sure all electrical items (A/C, audio unit, defogger, lights, etc. Check these items before using the sensor input display mode Honda crv 96 Dears I note my Honda temperature was going up to the end I check the radiator there was no water inside I fill up the coolent and it's ok my question is the where is the old water could be there is no leak and cooling fan working good and everythin CEL 340 with '13 HOnda Odyssey Jul 24, 2008 · I have a 2006 Odyssey ex-L. Set the temperature control dial on Max Cool, then push the mode control button to select Vent. My 2004 honda odyssey heater wont heat, neither the front or the back! I changed the thermostat, I purged the system, I changed the cabin air filter and still no heat, the door that changes the settings from hot to cold works fine too, the hose from the heater core does get hot, so Im assuming the heater core its working, the only thing I did noticed its that the fans start working too soon. com (U. The defeated after World War II, Japan was quite far from complete "recovery. com. Air Conditioning System Diagnosis Repair Guide Print The A/C control panel has a self-diagnostic function for heating, ventilation, and air conditioning system. If the PGM-CARB warning lamp is lit, turn ignition On, pull passenger side carpet inspection flap downward under instrument panel and observe LED on top of control unit. Honda Car Manuals PDF & Wiring Diagrams above the page. If it doesn’t, then take the new TRI out of your Odyssey and put it in the test Odyssey. Looking for OBD codes? The second character is a 0 (zero)not a letter O P0533 is a diagnostic trouble code (DTC) for "A/C Refrigerant Pressure Sensor Circuit High Input". The audio-HVAC display panel has a self-diagnostic function for heating, ventilation, and air conditioning system. dealer found several codes in system drove Pilot home on the When the check engine light turns on, a fault code or OBD II code, detailing the nature of the issue is registered in your vehicle's diagnostic system computer. It will give Read More "Honda Acura SRS Airbag Code 5-1 Internal Failure of the SRS unit" Mar 10, 2015 · This article applies to the Honda Accord (1990-2002). Solving HVAC Problems; Part 1, Cooling System ▻. If it works, then your Odyssey’s TRI connections are screwed up somehow (dirt/carbon scoring/rodent damage). 1999-2002 2000 2001 Honda Odyssey A/C Heater Climate Control Unit OEM With Rear. 004 or later. Dec 29, 2016 · Then there is two to four screws on the inside of the case that secures the switch to it. To run the self-diagnostic function, do the following: 1. 5 distributor TD40U Honda Civic 1. If the problem had not been fixed, the Check Engine light would eventually come back on. Whether you’re running errands in Golden or heading out on a cross-country adventure, the Odyssey is designed to make every trip enjoyable. 57 Collision Mitigation Braking Seat Heater and Ventilation System (CMBS) OFF Button* Driving Position Memory System ENGINE START/STOP Button Switches* p. B-CAN controls "less important" things like climate control, audio, door locks, the blind spot indication system, and so on. 63 System OFF Button p. B-CAN controls "less important" things like climate control, audio, Interestingly, you can pull B-CAN error codes without a scan tool . A shop that specializes in Hondas probably knows. com The Honda Legend is a V6-engined executive car produced by the Japanese automaker Honda since 1985 that currently serves as its flagship vehicle, and provides the basis for the Acura Legend, RL and RLX — the flagship vehicle of Honda's luxury Acura division in North America. So steps 3-5 are essentially providing a "fake" control module system voltage to the transistor to see if the power transistor will turn on and allow the circuit to complete. On many pre-OBD II vehicles, all you had to do was disconnect the battery or pull the PCM fuse to clear the memory and turn the Check Engine light off. AC started blowing hot air, went to Honda dealer for diagnostics, the problem was condenser  While there are a variety of reasons your Honda Odyssey air conditioning won't work, the What will be the outcome of an air conditioning system diagnosis? 25 Oct 2016 My 2012 Honda Odyssey has two CAN systems, one is High Speed CAN and one is Low Speed CAN. Be sure to double check the codes. The engine system, in conjuction with the engine control module (ECM)/powertrain control module (PCM), activates the U0416 code solenoid valve to control oil pressure to the engine mechanism that is installed in the valve system to switch valve timing between Low and High. You can reset the trouble codes on your Cadillac right from your home garage, saving yourself a trip back to the mechanic or dealership. - Answered by a verified Mechanic for Honda Tri-Zone Automatic Climate Control. Booting in seconds and sporting a big 7-inch display, this diagnostic tool provides you a quick way to get you right down to business. The system automatically activates the defroster and heated outside mirrors under certain weather conditions. Jun 03, 2017 · This indicates that a collision was detected. Code description, posible causes and repair information | Powertrain Codes Page 1 | Engine-Codes. How to operate the climate control system, the audio system, and other convenience . Your car has several different control units for each function of your car and these can control almost all parts in your car. Do diagnostic tools read “crash data stored?” Did your dealership tell you that you have a bad module? At MyAirbags, an airbag module reset is $49. Because of OBD, we can generalize failures to specific codes, and make pinpointing problems easier. This code cannot be cleared or erased with any diagnostic scan tool. This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. the AC itself works fine mechanically, the air blower always blows like it's supposed to, all of the blower speed settings work, but the other climate controls on the dash board sometimes completely shut “Latest survey shows that 3 out of 4 people make up 75% of the world’s population. We have an expert staff that can perform any vehicle repair your Honda may need. Tips on car buying, how to negotiate, and how to buy a car. Code Description; P1106. Acura Integra - ECU AND ABS CODES HERE! - Many posts begin with My CEL is on! Whats wrong with my car?! Well here you go. . If the fan does not work, the transistor is bad. One of the best ways to enhance the enjoyment of your new vehicle is to read this manual. The DTC's of some OBD-I cars are interpreted in different ways, however. Nov 29, 2015 · This video will show you how to remove and replace the climate control assembly for the Honda Odyssey. Code 2. Trouble Codes Turn On Your Check Engine Light. The only safe way to clear fault codes is to use a scan tool or code reader. There is also a bonus section at the end for anyone Without Climate Control. Autel MP808, with powerhouse speed and performance, offers riches of diagnostic features and functions, including OE-level diagnostics, bi-directional control, key coding, special services and more. The Honda provides good handling, comfortable seating, and offers an ideal combination of acceleration and fuel economy. the fans work but they only blow hot air. Even though this may be true, there are circumstances where and OBDcode may not point to the obvious, and could require more research. Your Honda dealer is able to reset the Honda Maintenance Minder. Reason for Honda Odyssey B1960 and find the solution for the code Honda Odyssey B1960 , we'll give to how to fix Honda Odyssey B1960 trouble code problem. 2. All PCM codes start with the letter "P" for Powertrain. LX, EX and EX-L models come with a 5-speed automatic transmission, while Touring and Touring Elite Odysseys get a new 6-speed automatic. How to Troubleshoot the Climate Control System • 2008 Honda Odyssey • MotoLogic. The Pilot's tri-zone automatic climate control system is designed for year-round comfort. To run the the meaning of the DTC, refer to the DTC Troubleshooting Index. Please scroll down as some years are combined! (ex: 2010-17) So, your vehicle is “not ready” for an OBD Test. S. Great for dealerships, fleet repair shops, professional mechanics, libraries, schools & car enthusiasts. Continental Honda Service Department. In Hondaspeak, high speed CAN is called F-CAN and low speed CAN is called B-CAN and it runs at 125 kbps. Please scroll down as some years are combined! (ex: 2010-17) Can planting trees change the climate of an area? Asked in Honda Odyssey, Chevy Blazer S-10, Ford Ranger XLT they are diagnostic codes - blink blink blink - pause - blink blink is a 32 We will NOT respond to any requests by email. ca (Canada). cause of the abnormality before repairing, like engine misfire and fuel control concerns. AC & Climate Control Consult the service manual to verify the exact location of the low-side service port . The freshened 2020 Honda Ridgeline arrives at dealerships starting Dec. Those manufacturers include but are not limited to Acura, Buick, Chevrolet, Cadillac, Ford, GMC and Honda. Click the Read more: P0505 – Idle Air Control Valve Malfunction (Honda) A Torque Converter Clutch Malfunction code happens often on Honda Odyssey minivans from the 1999- 2004 period. The Cadillac's computer creates and stores information about its various systems. I checked the fuses and it doesn't seem to be a fuse problem. Turn the ignition switch OFF. He is an ASE Certified Master Technician and has bruised knuckles to prove it. Clearing Codes. I have a 2003 Honda Odyssey and the A/C stopped working yesterday. myhonda. If your "Check Engine Light" is on, it means your vehicle has one or more OBD II Trouble Codes so you have to check your engine diagnostic code tool. Rear heated oxygen sensor heater. Follow the steps in the video to see how both features function. We reset all fault codes, which means that after you receive your repaired module from us you will not have to take it to the dealership for additional programming. Starting letter U diagnostic code shows that there are problems in climate control system, lighting, airbags, etc. The HVAC control unit has a self-diagnostic function for heating, ventilation, and air conditioning system. Eddie spent 35 years in the automotive business with Honda. 5L V6 engine. Turn the fan switch OFF. 0L V6, 6th Generation 1998, 1999, 2000, 2001, 2002 Honda Accord troubleshooting, repair, and service manuals. More than just a list of Honda Check Engine Light Codes! Our resources can help P1166 HO2S11 Heater Circuit Fault (Bank 1 Sensor 1). What does that mean? This communication system diagnostic trouble code typically applies to most domestic and import fuel injected engines manufactured since 2004. It will give you years of driving pleasure. It is kind of a rattling sound. To run the self-diagnostic function, do the following: My 2012 Honda Odyssey has two CAN systems, one is High Speed CAN and one is Low Speed CAN. To set their desired temperatures, the driver and front passenger can just dial in their preferred numbers on the instrument-panel control. PGM-CARB. See also: Honda Check Engine Light Codes. Power flows to a blower motor relay first. On our 05 Odyssey, the front air conditioner blows warm air when the rear air is HOW TO RETRIEVE A DIAGNOSTIC TROUBLE CODES I have a 2003 Honda Odyssey and the AC stopped working yesterday. 21 Jan 2019 Location of OBD1 Honda Diagnostic Connector. It’s our experience that the charge indicator lamp on the dash does a good job of keeping the system in check — of course, that assumes the light is working as it should. Electronic control module (ECM). Chevy Dude Recommended for you Displaying Sensor Inputs at the Climate Control Unit The climate control unit has a mode that displays sensor inputs it receives. Bad driver side sensor in the electronic climate control because the left side is switched to heat instead of cool. Control Module Communication Bus "A" Off. Catalyst, Evaporative System(EVAP), O2 Sensor Heater, Secondary air, Heated . Working on . Honda Odyssey AC Is Not Working? RepairPal will help you figure out whether it's your AC Refrigerant Leak, Climate Control Electrical Issue, AC Compressor, or something else. ) is left behind by the other scan tools. Most of the climate control lights on my 2007 Honda Pilot have been out for a while. Jul 04, 2016 · My next step would be to take your old TRI and stick it in another Odyssey with a known-working climate control. Page 5 VISUAL INDEX VISUAL INDEX Dashboard and Nearby Controls Vehicle Stability Assist (VSA) Accessory Power Socket p. * Cruise control and navigation information such as Tach, Vehicle Speed Signal (VSS), and Brake wiring can often be found in the alarm/remote start information available. 22 Technical Service Bulletins have been issued for the 2018 Honda Clarity Plug-In Hybrid. Your Honda Technician will have to use the Honda Diagnostic System (HSD) Computer to do a forced activation, allowing your vehicle to have proper time and mileage set. 00. This mode shows you what the climate control unit is receiving from each of the sensors, one at a time, and it can help you determine if a sensor is faulty. Resetting the Maintenance Minder is not as simple as Resetting the dash light and you may be charged. Honda/Acura P1200 to P1586 OBD II. If you need further assistance with removing and installing your climate control cluster switch, then seek out a professional, such as one from Your Mechanic, to help you. When possible we give the more commonly known OBD II component name. Was this The climate control unit has a self-diagnosis function. My automatic climate control is making a noise that sounds like an electrical motor hunting for position. 99 shipping 2003 Honda Odyssey OBDII Codes List . After a vehicle has been in an accident, the airbag module needs to be reset (cleared of hard crash codes) in order for the SRS/Airbag System to function properly again. Most late model Honda remote transmitters can be programmed using the steps on this page. That's what I thought. May 29, 2010 · Climate control controller is powered however is not working to control the air. The "Malfunction Indicator Lamp" (or MIL ) comes on to warn you when the Onboard Diagnostic System (OBD II) detects a problem that cold cause your vehicle's emissions to exceed 1. To run the self-diagnostic function, do the following: Turn the ignition switch OFF. helminc. The Odyssey tri-zone automatic climate control system with humidity control is designed for exceptional convenience and greater visibility. Press and hold the recirculation control and rear window defogger buttons Honda Odyssey B1960 OBD-II Diagnostic Body (B) Trouble Code Information Page. It alerts you to any malfunctions or servicing needs via warning and service lights on the instrument panel. P1241 Throttle Vent Control Motor Circuit 1 Malfunction. It is supposed to offer 14 diag codes by turning on  12 Apr 2018 The climate control unit has a self-diagnostic function. Oxygen Code 65. Remove those screws, unplug the harness, and remove the climate control switch cluster. Always consult the vehicle s service manual for more detailed testing instructions. I have a 2003 Honda accord ex 2. to come on and store one or more diagnostic trouble codes problem in the climate control unit 2012 Chilton's Asian Service Manual (Acura, Honda) - Volume 1 Mar 21, 2013 · 10. A/C Air Conditioner Diagnostics with trouble codes list, Reset, Sensor Data Climate control as a diagnostic tool. You have entered the Honda Specific OBD II Codes page. 1999 Accord ac control lights stopped working was created by Ricardo B It happened randomly and I don't know why. Distributors Honda Civic 1. honda. Honda Motor Corporation OBD I diagnostic trouble codes are retrieveable without any special tools by simply following the instructions here. Honda has a variety of dashboard warning lights that will illuminate from time to time, but there is somewhat of a trick to understanding them. I trouble shot it but I would suggest starting with checking for trouble codes. This fault code is stored and can only be retrieved with specialized equipment that can communicate with your vehicle's diagnostic system computer. Your selection of a 2005 Honda Odyssey was a wise Service Manual. 11. By accessing MB Medic How to fix U0405 engine diagnostic code For 2015 Honda Odyssey ? Starting letter U diagnostic code shows that there are problems in climate control system, lighting, airbags, etc. P1167 HO2S11 Heater OBD II code P0306. a damaged coil ( cause odyssey's are famous for that. This repair manual covers Acura & Honda Auto, Truck, Van & SUV models for 2009 & 2010. How to Troubleshoot the HVAC System Using the Self-diagnostic Function The HVAC control unit has a self-diagnostic function for heating, ventilation, and air conditioning system. To update the PGM-FI software, refer to service bulletin 01-023, Updating Control Units/Modules. To run the self-diagnostic function, do the following: Sep 03, 2015 · 9 fees to NEVER pay a car dealership. 004. When the AC is initially turned on, the compressor clutch engages momintairily (1-2 sec) and then disengages. 16 with a host of updates, including a standard 9-speed automatic transmission with paddle shifters, standard Honda Sensing® safety and driver-assistive technologies, and a more streamlined trim structure. 118 Climate Control System p. 5 times the legal limit. Each DTC has a set of testing procedures, Honda Specific Trouble Codes. logically, you would think there are 2 issues 1. 2006 Odyssey Online Reference Owner's Manual Use these links (and links throughout this manual) to navigate through this reference. Accord, Civic, CRX, CR-V, del Sol, Odyssey & Prelude. Code 1. Cadillac (gasoline) fuel-injected vehicles are equipped with actual on-board diagnostics, providing trouble codes, actuator tests and sensor data through the new digital Electronic Climate Control display. Your “Check Engine” light comes on when your car’s onboard computer (or PCM, Powertrain Control Module) records some kind of problem. Heated oxygen sensor A. Apr 21, 2012 · The climate control system in my 1999 honda odyssey is not working did anyone have any clue what it might be. There should be a way to retrieve diagnostic codes from the climate control system to determine the problem. If your dashboard warning lights come on that are critical indicators, come see our service department at Continental Honda. The Climate Control module controls the power transistor on/off. Page 30: Climate Control System Automatic Climate Control - Dual Zone Climate Control System Automatic Climate Control - Tri-Zone Climate Control System To retrain a button or erase codes, see the Owner’s Manual at owners. Honda Accord Air Conditioning Blowing Warm Air - 446 reports. Specific to: Honda Ridgeline 2006-2008. It'll run a self diagnostic and display codes if there's any issues outside of code zero. 3L 4cyl or 3. Tri-Zone Automatic Climate Control. For example when the inside temp is set to 70 degrees and the system is at or near that temp and the fan is has automatically set itself to low; you can hear this "hunting" sound from behind the dash. Designed for the experienced mechanic who is equipped to work on cars. Watch tutorials about your 2018 Honda Odyssey Climate Control, including videos and tips designed to improve safety and performance. Honda Odyssey B1233 OBD-II Diagnostic Body (B) Trouble Code Information Page. The codes are listed for Accord or Civic models seperately when required. These codes are stored when a sensor in the car reports a reading that is outside the normal/accepted range (Eg: fuel mixture too rich). Red or amber lights are the most critical and indicate that there may be a problem with the vehicle. In it, you will learn how to operate its driving controls and convenience items. The problem can be as simple as a blown fuse, or you may need to replace it. When I select front vent and AC, the fan does no turn on, and the AC condenser does not turn on and no air is coming from front blowers. During certain repair procedures, the status of these emission systems is reset by the repair technician. The codes are defined as to what system is affected. It'll also recalibrate the system as Your car has zoned climate control, so there are control baffles to adjust the temperature on either side. The air conditioner vents on the left side of the vechicle never bloow really cool air. ) or www. Stuck air vents tend to indicate a problem with your mode control motor. Climate Control Honda CRV 2002 - Climate Control Honda CRV - Air Con Control Unit P/N: PP-TD23 Honda Prelude 1992 - Climate Control Honda CRV 2001 - Climate Control Unit P/N: BQ919-399 Honda Odyssey 2002 - Climate Control Unit. There are several hundreds of powertrain codes, but some are much more common than others. The HondaLink® app has added new and exciting remote control features like Remote Engine Start, Remote Door Lock/Unlock, and Find My Car, available for 2018+ Odyssey Touring, 2018+ Accord Touring, 2019 Insight Touring, 2019 Pilot* and Passport* Touring/Elite vehicles. Disconnect the negative battery cable for at least 10 seconds to clear codes. Watch the video and see how easy it is to program your Honda key fob transmitter. Autel AutoLink AL319 OBD2 Scanner Automotive Engine Fault Code Reader CAN Scan Tool . 5 May 2009 Mine has automatic fan control and in the service manual it is called "Climate Control". I trouble shot it but have hit a wall. Sep 15, 2009 · Blower Motor Honda How to fix a problem Blower Motor on Honda. 2008 Odyssey Congratulations! Your selection of a 2008 Honda Odyssey was a wise investment. 79 +$9. ) are off. When the TCM detects a malfunction with the control, a signal is send to the Engine Control Module to trigger the Engine Light or Service Engine Soon light. " By focusing all resources to restore what has been destroyed, the country could hardly fill all the voids created. Use the HDS to update the PGM-FI software in the ECM/PCM, using HDS version 2. Barometric Pressure Circuit Saab 9-5 Climate Control Questions. If your "Check Engine Light" is on, it means your vehicle has one or more OBD II Trouble Codes. Turn the ignition switch Diagnostic trouble codes (or fault codes) are codes that are stored by the on-board computer diagnostic system. Replacing it is not difficult at all. To run the  18 Jun 2006 How to Retrieve a DTC The audio-HVAC display panel has a self-diagnostic function for heating, ventilation, and air conditioning system. pdf Diagnostic Trouble Code Library. It automatically maintains individual climate-control settings for the driver, the front passenger and the rear cabin. These are stored in response to a problem found in the car by the system. When you turn the key to on the relay provides power directly to the blower motor. All vehicles with an OBD2 port are required to output basic information when the Check Engine Light comes on. find out! CELs, although hated, are much better than a problem coming up without a CEL, at least you can pinpoint the problem, so be thankful! The 2020 Honda Odyssey interior offers Denver families a wide array of comfort, technology, entertainment, and convenience features. P0141 2003 HONDA ODYSSEY 8,119 Views O2 Bank 1 Sensor 2 Heater Circuit Malfunction Bank Let me guess, you have duel electronic climate control. Honda dashboard warning light symbols and meanings. Only BlueDriver gives you the complete set of diagnostics on a wide range of manufacturers. If the engine solenoid valve has an open or short circuit, a DTC is stored. Honda endeavored to make the Odyssey's body very rigid, which helps make it one of the most refined-riding and precise-handling vans on the The only safe way to clear fault codes is to use a scan tool or code reader. Trending at $35. Download Full Version Honda Odyssey Climate Control Dtc Codes. For a printed owner's manual, click on authorized manuals or go to www. Check Engine light codes. If the blower fan works, the control system is faulty. This code means that your vehicle was in an accident and now has crash data stored in the ACM airbag control. We wrote about some of the common codes, including possible causes and diagnostic information. Features: The Odyssey is big and spacious, yet it doesn't feel bulky. Reason for Honda Odyssey B1233 and find the solution for the code Honda Odyssey B1233 , we'll give to how to fix Honda Odyssey B1233 trouble code problem. The blower motor circuitry in Hondas is much different than the traditional switch/resistor setup found in other vehicles. This is the same unit from 1997 to 2001. OBDII B Code Definitions. Source Codes 0 and 11. Jul 16, 2014 · Honda charging systems won’t present many problems for the experienced tech, but there are a couple of things to keep in mind. 6 distributor TD42U Honda Accord distributor TD31U P0700 Meaning The Transmission Control Module (TCM) monitors the malfunction of sensors and actuators relating to transmission control. All Odyssey models are powered by a 248-horsepower, 3. $30. May 14, 2017 · Honda Odyssey (2006 – 2007) – fuse box diagram Year of production: 2006, 2007 Primary engine compartment fuse box Number Ampere rating [A] Circuit protected 1 10 Left Headlight Low 2 30 Rear Defroster Coil 3 10 Left Headlight High 4 15 Small Lights 5 10 Right Headlight Low 6 10 Right Headlight High 7 7,5 … Which functions does the Honda Econ button affect when enabled? When you are enabling the Honda Econ button, a lot of things in your cars electrical system is affected even if you can’t see it. How to fix U1286 engine diagnostic code For 2014 Honda Odyssey ? Starting letter U diagnostic code shows that there are problems in climate control system, lighting, airbags, etc. After my honda accord 2004 had its battery dead bought a new battery my car was ok but my radio wasn't working so i followed steps of getting the code by pressing the reset buttons 1 and 6 got the code entered it and radio was back on however the radio stays on for 2minutes and goes off even when i turn off the engine and turn it back on the We will NOT respond to any requests by email. This onboard computer Some of the Premium Climate control systems with Electronic displays have a computer diagnostic system which self-diagnoses problems but you need the sequence codes and explanation of where the bad part is located. The status of the NHTSA — Electrical System Problems. What now? Why your vehicle may not be “ready”: Your vehicle’s On-Board Diagnostic (OBD) computer reviews the status of the emission systems within the vehicle. ” Home | Terms of Use Chrysler | Ford | GM | Honda | Jeep | Tools | Disclaimer FREE Honda keyless entry remote programming VIDEO and programming manual. the lights do not light up on the dashboard at all. I used it on 2010 Honda Odyssey and 2007 accord. '00 Honda Odyssey climate control panel intermittently unresponsive i have a 2000 odyssey that has problems with the climate control panel. However, a lot of important information (such as ABS, Airbag, Climate Control, etc. OBDII Trouble Code List. The Odyssey is big and spacious, yet it doesn't feel bulky. Codes from B0000 to B1000 and B3000 to B4000 are Generic, defined by ISO/SAE. The one for the driver’s side is obviously malfunctioning. Code 67. - Duration: 17:34. How to Troubleshoot the Heating/Air Conditioning How to Use the Self-diagnostic Function The HVAC control unit has a self-diagnostic function for heating, ventilation, and air conditioning system. How to Recharge Your Vehicle's Air Conditioning. 4 with code p0420 coming up I have changed both o2 sensors and the catalytic converter but the CEL 340 with '13 HOnda Odyssey 1) Heater System Electrical Idle Air Control Valve Circuit Failure. honda odyssey climate control diagnostic codes