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Fix for Honda Keyless Access/TPMS Control Unit 🚘🔧⚙️ index.htm ⮐
You can do a lot yourself and learn a ton, all thanks to the info
available online today. Many people won't even pop their hood unless
there's smoke coming out of it, but what would've been a pricey trip
to the dealer turned into a simple DIY fix!
Problem
My wife comes into the room and goes, "The car alarm's going off.
Are you sitting on the keys?" I wasn't, but I go outside to check
it out. The alarm's blaring and I can't get the keyfob to do anything.
It's unresponsive. I can't unlock the doors and I can't shut it off.
I use the actual key to open the door, old-school style. Still doesn't
stop the alarm. It's been going off a while now, and I'm a little
concerned that a neighbor's going to show up. Dashboard's lit up like
a christmas tree with warning lights, and I can hear relays clicking
like crazy.
💡 First, It's important to analyze the problem and see if you
think you can solve it. Know the stakes and own your decisions.
Often things like this go sideways and if you jump in without a
backup plan and things go south, then you're just left with you,
the problem, and a bigger mess you created. Are you ready to
handle it if you make the problem worse or can't can't crack it?
Troubleshooting
I head to the garage, but can't remember what socket size I need
for the battery terminal, so I just grab an adjustable wrench to
disconnect it. Finally, everything goes quiet. Figured maybe it just
needed a reset, so I reconnect the battery. Dashboard's still going
haywire. Try to start the car... nothing. I disconnect and reconnect
the battery a few times, hoping it'll snap out of it but no luck.
Next move? I look it up. Found a YouTube video of someone fixing
the same problem, plus a TSB on the NHTSA site about a similar
issue in a different model.
Solution
Turns out the fix doesn't even involve a trip to the dealer. All you
have to do it pull off some trim to remove the glovebox and pull out
the keyless entry/TPMS module. I thought getting the glovebox out
would be a pain, but it wasn't bad, definitely easier than pulling
apart the dashboard in my truck just to replace the cabin filter.
The real challenge was opening up the module without breaking it.
It took about a half-hour to carefully get it open so I could clean
off the
dendritic growth
with a cotton swab and some alcohol that
was shorting one of the integrated circuits. Once that was done, I
plugged it back in, tested it before reassembling everything and
it worked! Problem solved. Saved myself about a thousand bucks
from the dealer who would've happily charged for a new part and
labor.
💡What was my plan B? I'd have towed the car to the dealer
if all else failed and was comfortable with the fact that I
might break something and end up with a repair that costs
more than it would've in the first place.
💡Would I to try to replace a 100 amp 120VAC sub-panel in
the garage? No way! The stakes are too high ☠️⚡, and that's
a whole different level of risk. Some problems are best left
to the experts.
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