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Not sure, but I don't believe the blinker sound is done through the OBDII data bus --> radio (as the headlight ON and door OPEN chimes are).

Others here have had the instrument cluster out, they'll probably know.
 

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The BCM controls the turn signal indicator lights over the Serial Data Bus. The flasher that turns the signal lights ON/OFF is located in the BCM, but the "clicker" is in the instrument cluster. It is probably mounted on the logic board. Haven't yet found out how the clicker is powered/controlled.
 

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So, my blinkers work fine. But, the audible click in the cab no longer clicks... Not a deal breaker but I would like it to click again so I can know my blinker is on... Anyone else have this issue?


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Yes, I just bought my 2005 colorado, and I have the same problem, after searching the forum, it looks like there is a small speaker on the back of the instrument panel that has gone bad.
 

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The turn signal sound comes from a speaker that is soldered to the back of the instrument cluster. To replace it you have to find one from another cluster as this part is not available as a single unit. If you want a softer sound one from a Pontiac G6 will work with some modification .
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