OD TSB 18-137 - AC Control Unit change ? Why and what part #'s

SCOPESYS

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To me, this TSB raises far more questions than it answers.


TSB 18-137 call "to change" the AC Control Unit .

Anyone know what the NEW "Ac Control Unit" part number is, and how if differs from the ones that have to be replaced ?


I assume there are "old AC Control Unit" parts numbers listed somewhere that this TSB says should be replaced with their new counterpart.
Maybe this information is now currently on the Honda Service "subscription" Website ?
Anyone have access and can check ? PLEASE :)

Somehow Dealers must know what Part# need to be replaced with what new Part # ??

There have been posts in this forum, where members have had the TSB done, but not got the AC Control Unit replaced.
WHY ? Not needed ? None available (Run Out), Dealer being Lazy ??


Do all 2018 GenX 1.5L-T's have the same AC Control Unit

What has changed in the NEW Unit ?? Changed parameters, or was there something defective (wrong) in the old units that was adding to the OD.

Before I let a Dealer loose on my car, and changing stuff, I would like to know exactly what part# is being changed to & why, especially as it sees to be running "just fine" as it is from the factory.

If I don't let the Dealer do this TSB, does this void my engine warranty. ?

How about those that live in warmer states, and have not been told to get this TSB done.
What if they move further north.. same Vin # !!! How does that work.. ???

Why do some Dealer in the Northern USA States still claim they know nothing about the TSB ?

All seems very vague & "Hit & Miss".

Does not sit well with my "Engineer's Mind" !!!

And yes, it's a sad state of affairs when I put more trust in answers from people who I have no clue who they are on an Internet Forum, than from talking "face to face" to (or should that be " 2 faced") Dealer - especially one of their so called "Service Consultants" , most of who seem to have little or no Auto Technical knowledge, and then make that an excuse for not being able to guarantee that what they tell you is technically correct !!!
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To me, this TSB raises far more questions than it answers.


TSB 18-137 call "to change" the AC Control Unit .

Anyone know what the NEW "Ac Control Unit" part number is, and how if differs from the ones that have to be replaced ?


I assume there are "old AC Control Unit" parts numbers listed somewhere that this TSB says should be replaced with their new counterpart.
Maybe this information is now currently on the Honda Service "subscription" Website ?
Anyone have access and can check ? PLEASE :)

Somehow Dealers must know what Part# need to be replaced with what new Part # ??

There have been posts in this forum, where members have had the TSB done, but not got the AC Control Unit replaced.
WHY ? Not needed ? None available (Run Out), Dealer being Lazy ??


Do all 2018 GenX 1.5L-T's have the same AC Control Unit

What has changed in the NEW Unit ?? Changed parameters, or was there something defective (wrong) in the old units that was adding to the OD.

Before I let a Dealer loose on my car, and changing stuff, I would like to know exactly what part# is being changed to & why, especially as it sees to be running "just fine" as it is from the factory.

If I don't let the Dealer do this TSB, does this void my engine warranty. ?

How about those that live in warmer states, and have not been told to get this TSB done.
What if they move further north.. same Vin # !!! How does that work.. ???

Why do some Dealer in the Northern USA States still claim they know nothing about the TSB ?

All seems very vague & "Hit & Miss".

Does not sit well with my "Engineer's Mind" !!!

And yes, it's a sad state of affairs when I put more trust in answers from people who I have no clue who they are on an Internet Forum, than from talking "face to face" to (or should that be " 2 faced") Dealer - especially one of their so called "Service Consultants" , most of who seem to have little or no Auto Technical knowledge, and then make that an excuse for not being able to guarantee that what they tell you is technically correct !!!
the main change that matters is the software update of the AC control module to not allow heat into the cabin until the engine is warm. From what Im told those that need the new AC module have one that cant run the way the new module does. Also, heard of a couple stories where the dealer put the wrong module in, and those with dual climate control no longer had dual climate control......whoopsie
 

PowerPerLiter

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My question is what will the hondata and ktuner updates that include the software side of things do if the control unit is not also replaced? Im trying to avoid taking it in.
 

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I thought I read in one of the many of the OD forums, that they are now doing a software only update instead of replacing this component. If so, what is the part number of that software update?
 

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My question is what will the hondata and ktuner updates that include the software side of things do if the control unit is not also replaced? Im trying to avoid taking it in.
The software is the only part they care about. They incorporated the change into the tunes now. I do know there were multiple software update versions so that probably depended on model and if they had the update AC module already. Ktuner is still asking people who get the update to email them before reflashing after the update to make sure they have all copies of the new update.
 


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Question. I took my car in for an oil change and asked about the TSB. The service advisor said it was just hitting Maryland and they didn't have the software to do the flash yet. So I just did my oil change. I was glad because I didn't have to worry about it affecting my tune.

Now for my concern. Ktuner has updated their software to be compatible with the dilution changes. If I upload to the newest Ktuner software, will I be OK uploading my tunes considering I'm on the original Honda/Ktuner pre-dilution software?
 

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Question. I took my car in for an oil change and asked about the TSB. The service advisor said it was just hitting Maryland and they didn't have the software to do the flash yet. So I just did my oil change. I was glad because I didn't have to worry about it affecting my tune.

Now for my concern. Ktuner has updated their software to be compatible with the dilution changes. If I upload to the newest Ktuner software, will I be OK uploading my tunes considering I'm on the original Honda/Ktuner pre-dilution software?
you would still be choosing the tune that matches your stock software.
 
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SCOPESYS

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OK, so a lot of confusion :)

I'll add to it ..

I thought that there was 2 separate items that were addressed.

(1) The ECU was re-programmed - optimizing the DI, and setting the idle higher until engine had warmed up.
This would be the one that impacts on any Tune you might have installed, and potentially would get undone, if you Tuned again after the update, and the tune did not include the Honda updated features ?

(2) They swap out the Climate Control Computer Module ( approx an $80 unit).
I assume that is to stop the heat from getting to the Cabin, until the engine has heated up to a near working temperature, and by not initially directing so much heat to the cabin, it allows the engine to heat up quicker.

It would also seem that some Dealers are equally confused about what A/C Control Computer part number to fit, -- ie some put in the incorrect one, and lose the dual A/C functionality.

FUBAR come to mind !!!

Sure looks like the technology of modern cars has exceeded some Dealer's ability to comprehend what they are doing... but that applies to so many things these days -- got so complex that few really understand, and those who are meant to, are not able keep up with the technology.

If the 2019 cars have the newer units, it should be possible to compare the parts list for a 2018 & 2019 particular model, and see if the S/C Control Computer has an updated number.

Possible, but obliviously beyond the ability of some Dealers.

In any case, the TSB's PROCEDURE "should" include all this part number info !!

As I said -- FUBAR !!
 

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OK, so a lot of confusion :)

I'll add to it ..

I thought that there was 2 separate items that were addressed.

(1) The ECU was re-programmed - optimizing the DI, and setting the idle higher until engine had warmed up.
This would be the one that impacts on any Tune you might have installed, and potentially would get undone, if you Tuned again after the update, and the tune did not include the Honda updated features ?

(2) They swap out the Climate Control Computer Module ( approx an $80 unit).
I assume that is to stop the heat from getting to the Cabin, until the engine has heated up to a near working temperature, and by not initially directing so much heat to the cabin, it allows the engine to heat up quicker.

It would also seem that some Dealers are equally confused about what A/C Control Computer part number to fit, -- ie some put in the incorrect one, and lose the dual A/C functionality.

FUBAR come to mind !!!

Sure looks like the technology of modern cars has exceeded some Dealer's ability to comprehend what they are doing... but that applies to so many things these days -- got so complex that few really understand, and those who are meant to, are not able keep up with the technology.

If the 2019 cars have the newer units, it should be possible to compare the parts list for a 2018 & 2019 particular model, and see if the S/C Control Computer has an updated number.

Possible, but obliviously beyond the ability of some Dealers.

In any case, the TSB's PROCEDURE "should" include all this part number info !!

As I said -- FUBAR !!
I dont think you should really worry so much about it. Its not like its a fix, its a bandaid to warm the engine up faster for those with extreme dilution and keeps the heat exchanger from opening to the cabin until the engine reaches a certain operating temperature.
 

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had the TSB done and the A/C works exactly how it did prior to the update. Engine still doesn't warm fully up on the way to work and when I park I can watch the temp drop all the way to no bars on the display and the blower fan never slows down. Also I was really hoping they would have the Defroster not blow as fast as possible when the car was remote started, but they didn't change that either. The car does idle higher now. That's the only difference. Also I only had it done since the maintenance minder was telling me I was due for an oil change anyhow. Pretty lame I had to give them a filter to spin on while they were doing the TSB though, pretty cheap Honda.
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