Key fob hidden button ? - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum

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Old 03-09-2019, 11:37 AM
Scott Branson Scott Branson is offline
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Join Date: Mar 2019
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Key fob hidden button ?

I have a 2007 Trailblazer and I decided to take my key fob apart and give it a good cleaning to get rid of a few years worth of gunk. While I had it open for cleaning, I decided I wanted to separate the rubber button thingy from the circuit and clean up the actual the hopes that it might help with the range and the fact that sometimes I have to try a few times with both the lock and unlock buttons before they do anything...although the emergency button always work even if you barely touch it.

Anyway, when I pulled the rubber cover off I noticed that underneath, it actually has four contact pads on the circuit, although the fob only has three buttons. I was wondering if anyone else had noticed this, and was really curious if anyone knew what that unused fourth contact pad might do, if anything.
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Old 04-07-2019, 09:49 PM
BJohnson-03TB's Avatar
BJohnson-03TB BJohnson-03TB is offline
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2003 Chevy TrailBlazer LT EXT
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from what i understand these key fobs are widely used, since the 4th button wasnt needed in our situation they just werent used. if you had another vehicle they used the same model key fob, you most likely could reprogram it to that vehicle and use the 4th button. just my
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Old 04-08-2019, 09:10 AM
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TB-Al TB-Al is offline
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2007 Chevy TrailBlazer LS
Graystone Metallic 4.2L I6 2WD
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It appears that the 4th button is to open the trunk. MYT3X6898B is the correct FCC ID number.
"It is useless to do with more what can be done with less." William of Occam
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