BSM Off Flashing

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2010 CX-9 GT
Mine started flashing one day last week on the way to work. It came on again on the drive home. It did not come back on the next day and has not come back. Weird. First time that has happened in 10 years of ownership.
 
Hey, in case this helps. We had the same problem with blinking BSM light on the dash, 2008 CX9. Then we also noticed the "one touch" window system didn't work. Windows went up/down but you had to hold the button. It seems when the battery in the car dies the car forgets how the one touch windows work. So we reset them and now the BSM blinking light is off (went off with driver window reset). Go figure. Turn on car (no need to start it), open window all the way, then close it all the way and hold the button for an extra 2 seconds. That resets the one touch window system and in our case turned off the blinking BSM light.
 

helbigtw

T-Rav
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PA
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08 CX-9 GT FWD
That's crazy. BSM still works most of the time but when driving around town, after several minutes it starts flashing, but only when above about 75 outside. Does not happen in winter. When going on the interstate it will eventually revert back to normal due to airflow. Window is set to non-smoker preference, but I will have to try that reset. Funny because the first time it ever happened was when I put the window down one time on the interstate...
 
That's crazy. BSM still works most of the time but when driving around town, after several minutes it starts flashing, but only when above about 75 outside. Does not happen in winter. When going on the interstate it will eventually revert back to normal due to airflow. Window is set to non-smoker preference, but I will have to try that reset. Funny because the first time it ever happened was when I put the window down one time on the interstate...
All I can say is it’s been over 75 where I live for a few weeks now so maybe it’s related to that too. Quirk.
 
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2010 CX-9 GT
Mine started flashing one day last week on the way to work. It came on again on the drive home. It did not come back on the next day and has not come back. Weird. First time that has happened in 10 years of ownership.
...and the same thing just happened again, six months later. On for a couple of short trips one day last week and then back off. No idea why.
 

helbigtw

T-Rav
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PA
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08 CX-9 GT FWD
...and the same thing just happened again, six months later. On for a couple of short trips one day last week and then back off. No idea why.
My best guess is proximity of the radar modules to the mufflers. Heat affects electronics lifespan.
 

GT4GT

2020 AWD GT, 2008 FWD GT
I owned a 2008 CX-9 until last week (bought a 2020 CX-9). For the last 4+ years, I had the "BSM Off" problem. It would come and go--probably related to the heat. A car wash always solved the problem, either by cooling down the sensor or cleaning it.
 
Hey, in case this helps. We had the same problem with blinking BSM light on the dash, 2008 CX9. Then we also noticed the "one touch" window system didn't work. Windows went up/down but you had to hold the button. It seems when the battery in the car dies the car forgets how the one touch windows work. So we reset them and now the BSM blinking light is off (went off with driver window reset). Go figure. Turn on car (no need to start it), open window all the way, then close it all the way and hold the button for an extra 2 seconds. That resets the one touch window system and in our case turned off the blinking BSM light.
Following up on my prior post - turns out this did not work after all. It (or something) reset the dash light so it stopped blinking, but then the next time we got over 40mph (or so) the blinking light began again. Back to "what the heck" for us.
 
I owned a 2008 CX-9 until last week (bought a 2020 CX-9). For the last 4+ years, I had the "BSM Off" problem. It would come and go--probably related to the heat. A car wash always solved the problem, either by cooling down the sensor or cleaning it.
Thanks for the tip. I had ours washed yesterday after reading your post. Still blinks. I let it cool down. Still blnks. Then when I got home I crawled under the car, hand washed the sensors and inside fender/bumper on both sides, checked the wires to make sure they are plugged in. Still blinks. I give up!
 

helbigtw

T-Rav
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PA
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08 CX-9 GT FWD
Thanks for the tip. I had ours washed yesterday after reading your post. Still blinks. I let it cool down. Still blnks. Then when I got home I crawled under the car, hand washed the sensors and inside fender/bumper on both sides, checked the wires to make sure they are plugged in. Still blinks. I give up!
What about cleaning the connectors/pins?
 
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2011 CX-9 GT AWD
I have same issue with 11 cx9 gt. BSM light was blinking on dashboard. I have run the diagnostic test for left and right BSM on computer. The left was working fine and computer gave me error code for right handside. it was showing short. I tried to reset a few time. it was working fine. I washed the vehicle and inside of the fenders too. I drove the vehicle without any issue. I parked my car for 2 days and checked the car. light was blinking on the mirror like something was touching and grounding. I removed the modules.

I havent touch them about 6 months and decided to open the inside. of course lots of corrosion. I was planning to clean them then test but board does not come out without removing the socket. the socket looks like hot pressed or glued inside. I wanted to share the picture with you if anybody is interested to repair own modules.

gently pry the plastic covers pins with flat head screw driver then open it. Also check the contact on the board.

UPDATE: You can remove the board with soldering machine. when you remove the all of screws on the board, 2x 4 pins (left hand side on picture #3) holds it. remove them clean the board and housing, solder it again and seal the entire module. I hope it works for someone.
 

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Mazda CX-9 Grand Touring
Interesting thread. We have had intermittent flashing BSM for a while 2009 CX-9 GT 145K miles. Will examine the rear bumper area now.
 
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