2016 Honda Fit GK5 CVT EX-l Keyless Access (smart key) registration failure

Paul Owner/Technician California Posted   Latest   Edited  
Resolved
Electrical
2016 Honda Fit EX 1.5L (L15B1) (GCCA) — 3HGGK5H85GM702114
Smart Key Registration Failure

Replaced the push button start switch because one of its switches had failed and it took several tries to start or stop the engine. (Yes, I know there's an extended warranty, but our customer wanted us to do it anyway, I now really wish they hadn't).

Per instructions it should be plug and play. Just replace the switch, clear codes, and drive away. However, the car would only start when the key was held against the button. (It had worked fine before (and the smart key battery is fine). Instead of doing some research (which it what I should have done), I figure it just needs to be registered. Stupid me. 

After a series of poor decisions, my current situation is this. No keys are registered, and the keyless access ECU is uninitialized. When I attempt either an “all keys lost” or a “replaced keyless access ECU”, the process fails. I'm using the HDS with a PCM code from Honda. I also have an AutoProPad, but I'm not having any luck with that either. 

Here's my question: what are the possible causes of the failure to register? HDS asks how many keys I'd like to register. I say 1 because that's all I have right now. Click OK, then there's a near immediate message something like “Keyless Access Remote Registration Failed”. Maybe it's just something stupid? Toyota likes the driver's door open. Honda likes all doors closed. If you know of any reasons why it might not be working, please let me know. So far, I've found my HDS immobilizer utility was a version behind, so I updated that. I've closed the hood latch in case that counts as a “door”. I'm now considering buying a fresh keyless access ECU and trying that. I'm about 4 hours into this one and I only billed 0.5 on to replace the button. 

Any help will be appreciated. Thanks.

0
Thomas Technician
Alabama
Thomas
 

I know this is going to sound dumb but does this car have a diamond accent ring around the push button you would buy at a pep boys or the like?

0
Ð Awarded
Paul Owner/Technician
California
Paul
 

Nope. Doesn’t sound dumb to me. But the push button is brand new and doesn’t have any jewelry. Thanks for your response.

0
Ð Awarded
Tony Owner/Technician
Missouri
Tony
 

Are you sure the “all keys lost” procedure doesn't need to be initiated and completed through the same HDS and session? You mentioned getting a PCM code through Honda but clarification is needed; was that via your VSP cred or asking the service manager for a code? I don't have VSP cred so I can't get experience this stuff.

0
Ð Awarded
Paul Owner/Technician
California
Paul
 

I’m a licensed locksmith and I got the code directly from the Honda website. When you can’t turn the key on, the HDS gets the VIN from you first and then either wants you to log in with Honda credentials or enter a PCM code before you can even see any of the immobilizer functions. I assume that if the PCM code was incorrect I wouldn’t have been allowed to start the process. It’s a valid question…

0
Ð Awarded
Manuel Diagnostician
New Jersey
Manuel
   

Friend disconnect battery wait a minute and try again. Don’t use HDs use auto pro pad force ignition on and do add key or all keys lost up to you

0
Ð Awarded
Paul Owner/Technician
California
Paul
 

I did try disconnecting the battery for a while, but tried with the HDS after. I’ll try the same with the AutoProPad tomorrow. Thanks.

0
Ð Awarded
Philip Educator
California
Philip
 

Paul, I'm silly to even respond to this because you know way more about all of this stuff than I do, but maybe I can make some suggestions on the research…. I just got set straight myself here on Diag having gone off in a wrong direction for failing to research a code and making a series of decisions having stepped off in the wrong direction. The power button typically only has an impact on…

+1
Ð Awarded
Helpful
Interesting
Paul Owner/Technician
California
Paul
 

There were three originally reported symptoms: 1. Sometimes the power mode wouldn't change when the button was pressed. 2. Sometimes the driver's door wouldn't unlock when the handle was touched, but it would always unlock when the key button was pressed. 3. Sometimes the trunk wouldn't open when the trunk button was pressed, but the customer wasn't sure if pressing the key button would work…

0
Ð Awarded
Laird Owner/Technician
Nova Scotia
Laird
 

Just wondering if you need 2 keys for an all keys lost scenario?

0
Ð Awarded
Jaime Mechanic
Florida
Jaime
   

Are there any codes present? With it only starting while pressing the remote to the button I wonder if the back up fuse in the under hood fuse box blew. I would check that as well.

0
Ð Awarded
Paul Owner/Technician
California
Paul
 

Currently it won't start while holding the key against the button because I managed to “unregister” all of the keys because I'm a dummy. I'll check the backup fuse for sure. Thanks for the tip. I'll start fresh this morning and recheck for codes etc. Yesterday the System Test 1 in the immobilizer utility was failing and it said the immobilizer/wireless unit was unregistered and the register it…

0
Ð Awarded
Paul Owner/Technician
California
Paul Resolution
   

Alrighty. It's tempting to post a resolution that makes it seem like I'm a little less of a fool, but I'll go ahead and post what the real problem was for posterity. I imagine that I'm not the only one dumb enough to make this mistake, and perhaps this will help someone in the future when searching for a solution on diag​.​net which is what I did before posting. This morning I started fresh. I…

+9
Resolution Ð Awarded
Helpful
Andrew Technician
Texas
Andrew
 

We have all been there brother… Loved the story though.. The Auto repair business can get a little crazy.

0
Ð Awarded
Tony Owner/Technician
Missouri
Tony
 

Awesome, thanks for the wrap up. At least you persisted and found it before buying a new KAECU.

0
Ð Awarded
Todd Mobile Technician
Alberta
Todd
 

Excellent post,really well written.

+1
Ð Awarded
Agree
Philip Educator
California
Philip
 

Thanks for the cool followup, Paul I have run into at least one domestic vehicle (Jeep) that shut down the smart key system due to an open in a single antenna circuit, even though I believe it had four other working antennas. It was a similar scenario; the tech had installed a battery. But to do so, he had to remove a plastic panel which happened to have the rear antenna attached. He unplugged…

0
Ð Awarded
Geoff Diagnostician
Hawaii
Geoff
 

"I'm unclear why some manufacturers, in spite of having multiple antennas/oscillators, will paralyze the vehicle for the loss of one." I DOUBT that it's a designed plan. :-) Feliz año nuevo, Felipe!

0
Ð Awarded
David Diagnostician
Georgia
David
 

Loved finding out this had a logical solution. We all dread the moments that one day we will leave the customer without a ride home. I pick my jobs carefully just for this reason. Thank you for posting this issue as well as its resolution.

0
Ð Awarded
Geoff Diagnostician
Hawaii
Geoff
 

can you elaborate/clarify: "The Autel forced the ignition to the ON position and then I ran a health check." Forced how? Is that a special function or just happens when you scan or...? Thank you. (We are many years behind on average vehicle age, push button is rare, still.)

0
Ð Awarded
Paul Owner/Technician
California
Paul
 

Hi Geoff, The Autel (and the Honda HDS) will ask if the car is a push button start if it’s unable to communicate. If you answer yes, it will tell you hold the power button and when you do it will turn the power mode to ON. You won’t be able to start the engine, but with the key on you can pull codes and communicate. It will ask this question if you forget to plug the OBDII connector in, or…

+1
Ð Awarded
Thanks