PA6B 3D fix output question

Hello,

I have a question about the PA6B GPS Module, in my application when i power up the module, my 3D fix led attached to 3Dfix out start to blink, ok, but when the GPS is locked, the led stay on continuously ...
(I get data ok, no problem).

the datasheet say: "After 2D or 3D Fix, The pin should continuously output low-level signal"

also I have made a application with this module, one year ago, and without the kind of strange problem.

"The 3D-FIX is assigned as a fix flag output. The timing behavior of this pin can be configured by
custom firmware for different applications (Example: waking up host MCU). If not used, keep floating".

how it is possible, i have take a look into the " PMTK command packet" manuel , without succes ?

my power management is very critical, i need to get down this pin when the GPS lock

any idea ?

Thx
have a nice day.

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