Question about 2006 Honda Odyssey

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No heat left side

Checked blend door motor ok heat right ok ran self test ok no codes

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  • Honda Master
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This car has 2 heating systems , one front and one rear. ill assume its front bad. (an option day1 )
one more option is (also not stated) is the fancy CLIMATE CONTROL , option. (got that?) im guessing yes.

this car has this (can) very complex CC system. with a thermostat
for both driver and passenger. see buttons, there?
ok ,so how does that work, (read the FSM it covers ops)
it must modulate the 3 ports (IIRC its 3) left , rear and right.
so the left valve is dead, there is a micro damper there.
if it the magic control senses (sensors) its too cold it opens this micro damper. about 3" size. and you get heat.
so it can only be 3 things, the FSM on my car is even worse.
the Control sensors lied.
the Control failed to see input or say it and failed to send open commands to the micro damper to left side.
or the micro damper is DOA>

3 possibles.
Input bad
output bad (controller is bad)
slave is bad.
just like all thing like this , same 3 rules.
the fsm should cover testing each sub part, lost the FSM>?

Posted on Feb 11, 2014

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SOURCE: Sliding door(right side pass.) stuck

On the bottom near the open position of the door is a latching mechanism that is actuated by a solenoid. If the solenoid goes bad or the latch jams the door will freeze in that position. I can tell you where the problem is but because of teh way these interlocks work to prevent damage to the electric closing motor I am unable to explain how to by pass them. You should be able to remove the locking latch so you can close the door manually but that will not solve all of the problems. A Haynes repair manual on the vehicle should give you the steps needed to by pass and repair this problem, Chilton's should as well. These are the best sources I can provide for resolving this issue. The Dealer will most likely want a couple hundred to repair the issue if it isn't under warranty, the Haynes manual will only run about $20 and let you do this repair yourself.

Posted on Oct 31, 2010

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When heat is on it blow hot ondrivers side and cold on ppassenger side.


Do you hear any clicking sounds coming from behind the instrument panel ? Electrically controlled actuators move temp . blend doors and they wear out .Plastic gears etc..
Electronic Automatic Temperature Control System
The electronic automatic temperature control (EATC) system operation is determined by the settings on the EATC module. The EATC system automatically maintains a selected temperature for vehicle interior comfort, including capabilities to maintain separate temperature settings for the driver and front passenger. The electronic temperature control capabilities are achieved by splitting the air distribution system internally and utilizing 2 individually operated temperature blend doors. The EATC system is composed of the EATC module, automatic temperature control (ATC) solenoid and manifold, blower motor speed control, 4 vacuum control motors, 2 temperature blend door actuators, in-car temperature sensor, ambient air temperature sensor and solar amplifier (sunload sensor) to control the various functions. Do you know about DTC'S - diagnostic trouble codes ?

The electronic automatic temperature control (EATC) system must be diagnosed by first retrieving any DTCs, if present.
  • An on-demand (hard fault) DTC indicates that the fault is currently present. An on-demand DTC suggests a wiring fault, disconnected connector or component failure.
  • A continuous (intermittent) DTC alone (corresponding on-demand DTC is not present) indicates that the fault is an intermittent condition and may not be currently present. A continuous only DTC suggests a poor wiring connection, loose pin or terminal or intermittent component failure.
On-demand (hard fault) or continuous (intermittent fault) DTCs can be retrieved using a diagnostic tool. If using a diagnostic tool, refer to the diagnostic tool operating manual.
On-demand DTCs can also be retrieved by carrying out the Electronic Automatic Temperature Control Module On-Demand Self Test. To retrieve and/or clear continuous DTCs carry out the Electronic Automatic Temperature Control Module - Retrieve Continuous DTCs procedure. Always carry out the Electronic Automatic Temperature Control Module On-Demand Self Test before retrieving continuous DTCs.
If no DTCs are present, GO to Symptom Chart for the appropriate diagnostic action.

DTC EATC DTC Displayed Notes Description Action to Take B2266 2266 N/A LH Blend Door Failure or Short Go To Pinpoint Test A . B2267 2267 EATC Only RH Blend Door Failure or Short Go To Pinpoint Test A .
  • The dual temperature control is inoperative/does not operate correctly - Dual Zone EATC
  • Temperature blend door/actuator broken/binding
  • EATC module
  • CHECK the temperature blend doors/actuators for a binding or broken condition. If no condition is found, INSTALL a new EATC module. REFER to Section 412-01 . TEST the system for normal

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Have it checked for DTC'S - diagnostic trouble codes .
Electronic Automatic Temperature Control (EATC) Module DTC Chart NOTE: Some PCM DTCs may inhibit air conditioning (A/C) operation. If any PCM DTCs are retrieved, diagnose those first. Refer to the Powertrain Control/Emissions Diagnosis (PC/ED) manual. DTC Description Action to Take B1251 A/C In-Vehicle Temperature Sensor Open Circuit Go To Pinpoint Test A . B1253 A/C In-Vehicle Temperature Sensor Circuit Short to Ground Go To Pinpoint Test A . B1255 A/C Ambient Temperature Sensor Open Circuit Go To Pinpoint Test B . B1257 A/C Ambient Temperature Sensor Circuit Short to Ground Go To Pinpoint Test B . B2427 RH A/C Solar Radiation Sensor Circuit Short to Ground Go To Pinpoint Test C . B2426 RH A/C Solar Radiation Sensor Open Circuit Go To Pinpoint Test C . B2795 LH A/C Solar Radiation Sensor Circuit Short to Ground Go To Pinpoint Test C . B2796 LH A/C Solar Radiation Sensor Open Circuit Go To Pinpoint Test C . B2014 Evaporator Temperature Sensor Circuit Open Go To Pinpoint Test D . B1947 Evaporator Temperature Sensor Circuit Short to Ground Go To Pinpoint Test D . B295A LH Blend Door Potentiometer Feedback Circuit Open Go To Pinpoint Test F . B295B LH Blend Door Potentiometer Feedback Short to Ground Go To Pinpoint Test F . B226C LH Blend Door Motor Stalled Go To Pinpoint Test F . B295C RH Blend Door Potentiometer Feedback Circuit Open Go To Pinpoint Test F . B295D RH Blend Door Potentiometer Feedback Short to Ground Go To Pinpoint Test F . B226D RH Blend Door Motor Stalled Go To Pinpoint Test F . B295E Mode Door Potentiometer Feedback Circuit Open Go To Pinpoint Test F . B295F Mode Door Potentiometer Feedback Short to Ground Go To Pinpoint Test F . B226E Mode Door Motor Stalled Go To Pinpoint Test F .
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When outside is real hot, 100 degrees +, on hwy ac blows both sides cool. But once in a while after the engine is turned off and restarted, one side blows cool and the passenger side blows hot. We stop...


Your blend air door actuators go through a "self-test" process each time the ignition is switched off then back on again. They will swing to full hot, then Full cold, then settle to wherever you have them set by the control. What is happening is that the actuator for the passenger side is getting stuck during the self test. If you check for fault codes in your climate control system, you will most likely find a fault code that will state that there is a problem with the actuator or the blend-air door. If it corrects istself at times, it is most likely NOT a broken blend air door.
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