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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. 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.
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 and disconnect
the battery. 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. 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.
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