Buick Envision: SRS (Air Bag) Light On
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Date: 2023-12-05
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Comments and reviews: 19
CodycoWeb
You could probably view sensor resistance in scan data. Wiggle the connector while viewing scan data should show if it s connector issue. Service data should give you a range of resistance values for the sensors and the AES Wave kit has a variable resistor pot, set it to what is good and plug it into connector to prove sensor fault. There are a lot of factors needed for air bag deployment like vehicle speed and accelerometer to test for sudden direction change as well as pressure change speed on impact sensors. . This is so like if someone backed into your door slowly it wouldn t go off and stuff like that. Simply working with a single sensor and having the air bags deploy is very slim chance. Of course everyone has a sisters boyfriends second cousins friend that blew one up dropping a wrench on the radiator support.
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You could probably view sensor resistance in scan data. Wiggle the connector while viewing scan data should show if it s connector issue. Service data should give you a range of resistance values for the sensors and the AES Wave kit has a variable resistor pot, set it to what is good and plug it into connector to prove sensor fault. There are a lot of factors needed for air bag deployment like vehicle speed and accelerometer to test for sudden direction change as well as pressure change speed on impact sensors. . This is so like if someone backed into your door slowly it wouldn t go off and stuff like that. Simply working with a single sensor and having the air bags deploy is very slim chance. Of course everyone has a sisters boyfriends second cousins friend that blew one up dropping a wrench on the radiator support.
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spelunkerd
For anybody wondering if shorting the sensor is safe, he explains his confidence after 24: 00. I've always been paranoid about impact sensors, not wanting to cause embarrassing and expensive deployment. Scannerdanner got one memorable accident on camera, as I recall with a test light! As much as you'd think that airbags wouldn't go off when the engine isn't running and the car isn't moving, that didn't protect him. Evidently these new circuits have a narrow range of resistance values that green light bag deployment. Maybe Paul's test light was exactly inside that range?
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For anybody wondering if shorting the sensor is safe, he explains his confidence after 24: 00. I've always been paranoid about impact sensors, not wanting to cause embarrassing and expensive deployment. Scannerdanner got one memorable accident on camera, as I recall with a test light! As much as you'd think that airbags wouldn't go off when the engine isn't running and the car isn't moving, that didn't protect him. Evidently these new circuits have a narrow range of resistance values that green light bag deployment. Maybe Paul's test light was exactly inside that range?
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autorepair
Wondering if the diagonal sensor connection has to do with the potential rotation effect from an impact on one corner. A hit near the drivers door activates that bag as the passenger would be forced into that door but if that same impact would also cause the car to rotate in a clockwise direction it would cause the right rear passenger to impact the right side. Pretty smart setup if you consider the rotation effect from a cornering impact. Just a wild ass guess from a retired cop with no mechanical skills but a lot of report taking experience. lol
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Wondering if the diagonal sensor connection has to do with the potential rotation effect from an impact on one corner. A hit near the drivers door activates that bag as the passenger would be forced into that door but if that same impact would also cause the car to rotate in a clockwise direction it would cause the right rear passenger to impact the right side. Pretty smart setup if you consider the rotation effect from a cornering impact. Just a wild ass guess from a retired cop with no mechanical skills but a lot of report taking experience. lol
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davidjax3999
Eric,
The factory manual discusses problems with terminal degradation at the sensors with some repair tips (dielectric grease)
The manual also indicates that some of the sensors have a common ground within the SDM.
So, I think your in the right track.
The SDM is under the center console. I had an Equinox where my daughter would spill drinks in the car resulting in intermittent SRS Codes.
I have a 2017 Envision with 130K have not had any SRS problems. I don't understand how the connectors can all of a sudden go bad.
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Eric,
The factory manual discusses problems with terminal degradation at the sensors with some repair tips (dielectric grease)
The manual also indicates that some of the sensors have a common ground within the SDM.
So, I think your in the right track.
The SDM is under the center console. I had an Equinox where my daughter would spill drinks in the car resulting in intermittent SRS Codes.
I have a 2017 Envision with 130K have not had any SRS problems. I don't understand how the connectors can all of a sudden go bad.
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mikechiodetti4482
That is similar to the way I tested air bag systems years ago.
Once had a GM van that was in an accident. The passenger side air bag deployed but the driver's didn't and this was a frontal crash.
The clockspring in the steering wheel had a bad connector at the airbag. When watching live data and the connector shorted at the airbag side, instead of zero volts the display was showing a slow increase in voltage. A new clockspring fixed the problem.
Good one Mr. O.
On to part 2.
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That is similar to the way I tested air bag systems years ago.
Once had a GM van that was in an accident. The passenger side air bag deployed but the driver's didn't and this was a frontal crash.
The clockspring in the steering wheel had a bad connector at the airbag. When watching live data and the connector shorted at the airbag side, instead of zero volts the display was showing a slow increase in voltage. A new clockspring fixed the problem.
Good one Mr. O.
On to part 2.
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stevenkroot31
The cross cross setup kind of makes sense if your trying to save a couple of pennies. The module needs multiple sensor to trigger within so many milliseconds to trigger the airbags, if the left side airbags deploy the right side airbags would effectively be locked out. I don t know if there are 2 or 3 sensors on each side, if 3 then even if rear door is tripped due to opposite side impact the 3 rd sensor could still provide the 2 impact detection to trigger that side airbag.
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The cross cross setup kind of makes sense if your trying to save a couple of pennies. The module needs multiple sensor to trigger within so many milliseconds to trigger the airbags, if the left side airbags deploy the right side airbags would effectively be locked out. I don t know if there are 2 or 3 sensors on each side, if 3 then even if rear door is tripped due to opposite side impact the 3 rd sensor could still provide the 2 impact detection to trigger that side airbag.
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davebarcus7118
Regarding the loose fit of the connector on the LF impact sensor, it might have been caused by someone attempting to read voltage at the connector with a DMM. I caused a similar problem with the ABS system on a truck I used to own by probing the connector. I had inadvertently widened the socket and caused an open circuit to be detected by the system. I had to use a dental pick to bend the socket back to its normal shape, which fixed the problem.
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Regarding the loose fit of the connector on the LF impact sensor, it might have been caused by someone attempting to read voltage at the connector with a DMM. I caused a similar problem with the ABS system on a truck I used to own by probing the connector. I had inadvertently widened the socket and caused an open circuit to be detected by the system. I had to use a dental pick to bend the socket back to its normal shape, which fixed the problem.
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4b131
Poor pin contact on airbag connectors at Mazda are really common. I use a variable resistor set to 2 or 3 ohms and veiw the value on the scan tool to check wire integrity. If the tension is good you can watch the live resistance data and wiggle the connector when connected to see if it changes. I find seat air bags are the most common problem area as the constant movement and junk that get kicked under the seat can upset the connectors.
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Poor pin contact on airbag connectors at Mazda are really common. I use a variable resistor set to 2 or 3 ohms and veiw the value on the scan tool to check wire integrity. If the tension is good you can watch the live resistance data and wiggle the connector when connected to see if it changes. I find seat air bags are the most common problem area as the constant movement and junk that get kicked under the seat can upset the connectors.
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LunchBoxCan
I wonder if GM messed up the wiring into which Pin on the Airbag Module and that is why it sets the wrong alternate rear code? Because those are side impact and you'd want the Curtain air bags to go off on the front/rear of the same side at the same time, and not alternate rear with alternate front. I bet you that is what happened and GM probably doesn't realize. RECALL Maybe?
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I wonder if GM messed up the wiring into which Pin on the Airbag Module and that is why it sets the wrong alternate rear code? Because those are side impact and you'd want the Curtain air bags to go off on the front/rear of the same side at the same time, and not alternate rear with alternate front. I bet you that is what happened and GM probably doesn't realize. RECALL Maybe?
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alantorrance6153
At 6: 35 put some down tension on it, you said. Where are you pulling it, and how. You are actually pushing it from above. You actually intend, Put some down PRESSURE on it. Man, you are old enough and ugly enough to know the difference between Pressure and Tension. Tension is a pulling force. Pressure is a PUSHING force. PLEASE, PLEASE, PLEASE, LEARN AND USE CORRECTLY.
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At 6: 35 put some down tension on it, you said. Where are you pulling it, and how. You are actually pushing it from above. You actually intend, Put some down PRESSURE on it. Man, you are old enough and ugly enough to know the difference between Pressure and Tension. Tension is a pulling force. Pressure is a PUSHING force. PLEASE, PLEASE, PLEASE, LEARN AND USE CORRECTLY.
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robertlucas7384
GREAT video, as always. It makes sense if the sensors in opposite corners are related. If not physically, at some level within the SRS module. If a car is hit on a corner (hard enough for the airbag to deploy, the person sitting in the opposite corner will likely smack their head, if their airbag doesn't also deploy.
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GREAT video, as always. It makes sense if the sensors in opposite corners are related. If not physically, at some level within the SRS module. If a car is hit on a corner (hard enough for the airbag to deploy, the person sitting in the opposite corner will likely smack their head, if their airbag doesn't also deploy.
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earlestes8649
I broke my sensor plug on my gmc sierra under the right front driver seat I was sliding my gun under the edge of the seat, no more. After paying over 200 to diagnose I paid for the parts ie new plug and sensor I fixed it myself. Never used the sensor just new plug for a. Lesson learned. It was a pigtail plug.
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I broke my sensor plug on my gmc sierra under the right front driver seat I was sliding my gun under the edge of the seat, no more. After paying over 200 to diagnose I paid for the parts ie new plug and sensor I fixed it myself. Never used the sensor just new plug for a. Lesson learned. It was a pigtail plug.
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Hey_Its_That_Guy
Mr. O. is on hunt, yet again, to solve the elusive Envision sensor mystery. Will the new sensors fix the problem? Is Mr. O. on a wild goose chase? Will the lovely Mrs. O. grace us with an appearance? Can Mr. O. get the doors back together without the use of naughty words? Stay tuned for the next episode!
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Mr. O. is on hunt, yet again, to solve the elusive Envision sensor mystery. Will the new sensors fix the problem? Is Mr. O. on a wild goose chase? Will the lovely Mrs. O. grace us with an appearance? Can Mr. O. get the doors back together without the use of naughty words? Stay tuned for the next episode!
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onenuttybuddy
Hi Eric,
Super interesting. Wise not to use aftermarket airbag sensors. To much liability to risk it. I hope you, the wife unit and kiddos are all well. Happy post Thanksgiving. Xmas trees down here are 100 bucks a pop, So much easier to walk in the woods and cut your own. Take care, Alan from NC.
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Hi Eric,
Super interesting. Wise not to use aftermarket airbag sensors. To much liability to risk it. I hope you, the wife unit and kiddos are all well. Happy post Thanksgiving. Xmas trees down here are 100 bucks a pop, So much easier to walk in the woods and cut your own. Take care, Alan from NC.
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joeyashcraft3377
STUNTMAN 360 Shoulder Mount for maximum stability and comfort while mounting your action camera on your shoulder. Can also be worn at chest height or on the hip. I like your videos that you put out and you are very good mechanic. And I learn a lot from your Videos I think this might help you.
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STUNTMAN 360 Shoulder Mount for maximum stability and comfort while mounting your action camera on your shoulder. Can also be worn at chest height or on the hip. I like your videos that you put out and you are very good mechanic. And I learn a lot from your Videos I think this might help you.
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Sandbag1300
Brave. I don't know enough about how the air bag system works to short air bag sensor connectors to ground. Plus, some air bags are expensive and/or hard to source in older vehicles. I would not be surprised if the air bag sensing diagnostic module was made in China. Kris Crossed.
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Brave. I don't know enough about how the air bag system works to short air bag sensor connectors to ground. Plus, some air bags are expensive and/or hard to source in older vehicles. I would not be surprised if the air bag sensing diagnostic module was made in China. Kris Crossed.
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scrapenbass493
20: 54 Mr. Eric just wanted to make you aware that there is a quick high pitched beep sound about every second in the audio if you listen close you can hear it I don't know if it's something from your camera or something else but just letting you know it's a little annoying
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20: 54 Mr. Eric just wanted to make you aware that there is a quick high pitched beep sound about every second in the audio if you listen close you can hear it I don't know if it's something from your camera or something else but just letting you know it's a little annoying
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Micko350
Here I was thinking that we were all going for a ride along to Wilberts for some good 'ol 2nd hand fixy upy stuff!
That was bizarre(& now I'm 2nd guessing myself) because SRS related Wiring(inside the car at least) is all Yellow over here.
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Here I was thinking that we were all going for a ride along to Wilberts for some good 'ol 2nd hand fixy upy stuff!
That was bizarre(& now I'm 2nd guessing myself) because SRS related Wiring(inside the car at least) is all Yellow over here.
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AlanH-bh1cf
A guess. Are the split sensors maybe for redundancy? If you lose one sensor for some reason the other corner sensor on that side will probably still operate the air bag. If you lost the full side your protection would be completely lost.
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A guess. Are the split sensors maybe for redundancy? If you lose one sensor for some reason the other corner sensor on that side will probably still operate the air bag. If you lost the full side your protection would be completely lost.
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