airbag light question
Thread Starter
Melting Slicks
Joined: Jun 2004
Posts: 2,939
Likes: 0
From: norfolk virginia
airbag light question
i finished my project and now i have an airbag question. i replaced the bags and module and now when i turn on the key the light flashes 7 times and then stays on. one person i talked with says i need to replace the seatbelts, is that true? thans in advanced
Melting Slicks
Joined: Feb 2007
Posts: 2,787
Likes: 139
From: center of Kalifornia
I don't know your project but if a C5, my Mitchell crash book said to replace: Deployed air bag modules, sensors in area of impact, sensing & diagnostic module, seat belts in use at time of air bag deployment.
Now I suspect the seat belt listing is just to satisfy the lawyers, but if it has the lock up or charge type belt it does need to be changed out. If it functions normal than it probably is fine. You may just need a light reset from the dealer. If a side impact then side sensors need to be changed.
Now I suspect the seat belt listing is just to satisfy the lawyers, but if it has the lock up or charge type belt it does need to be changed out. If it functions normal than it probably is fine. You may just need a light reset from the dealer. If a side impact then side sensors need to be changed.
Thread Starter
Melting Slicks
Joined: Jun 2004
Posts: 2,939
Likes: 0
From: norfolk virginia
Le Mans Master
Joined: Jul 2002
Posts: 7,370
Likes: 8
From: Slave to the evil empire
Cruise-In V Veteran
St. Jude Donor '04
I came across something in the service manual the other day when I was looking up an SDM code for someone else and I saw that the SDM communicates with the BCM every time the car is started (this makes sense) what I didn't realize is the process also involves the PCM, on startup the SDM and BCM communicate a code which is the last 4 digits of the SDM part number and then the BCM and PCM communicate to each other the VIN stored in each computer if these don't match up the air bag light will illuminate and throw the code that I looked up (I'll have to go back and look to see which code it was???)
I don't know what project you had but I think it's safe to assume since you said body damage that the airbags deployed, correct?
Did you also replace the SDM with the airbags?
I have a project of my own that I'm getting ready to flatbed up to GM for programming and I'll have to get more info on SDM programming.
As far as the seat belts go there is nothing electronic on the passenger side belt and the drivers side receiver is only wired to a switch which turns the "fasten seat belt" light off when the car is started.
Thread Starter
Melting Slicks
Joined: Jun 2004
Posts: 2,939
Likes: 0
From: norfolk virginia
There are no sensors on a C5
I came across something in the service manual the other day when I was looking up an SDM code for someone else and I saw that the SDM communicates with the BCM every time the car is started (this makes sense) what I didn't realize is the process also involves the PCM, on startup the SDM and BCM communicate a code which is the last 4 digits of the SDM part number and then the BCM and PCM communicate to each other the VIN stored in each computer if these don't match up the air bag light will illuminate and throw the code that I looked up (I'll have to go back and look to see which code it was???)
I don't know what project you had but I think it's safe to assume since you said body damage that the airbags deployed, correct?
Did you also replace the SDM with the airbags?
I have a project of my own that I'm getting ready to flatbed up to GM for programming and I'll have to get more info on SDM programming.
As far as the seat belts go there is nothing electronic on the passenger side belt and the drivers side receiver is only wired to a switch which turns the "fasten seat belt" light off when the car is started.
I came across something in the service manual the other day when I was looking up an SDM code for someone else and I saw that the SDM communicates with the BCM every time the car is started (this makes sense) what I didn't realize is the process also involves the PCM, on startup the SDM and BCM communicate a code which is the last 4 digits of the SDM part number and then the BCM and PCM communicate to each other the VIN stored in each computer if these don't match up the air bag light will illuminate and throw the code that I looked up (I'll have to go back and look to see which code it was???)
I don't know what project you had but I think it's safe to assume since you said body damage that the airbags deployed, correct?
Did you also replace the SDM with the airbags?
I have a project of my own that I'm getting ready to flatbed up to GM for programming and I'll have to get more info on SDM programming.
As far as the seat belts go there is nothing electronic on the passenger side belt and the drivers side receiver is only wired to a switch which turns the "fasten seat belt" light off when the car is started.
Le Mans Master
Joined: Jul 2002
Posts: 7,370
Likes: 8
From: Slave to the evil empire
Cruise-In V Veteran
St. Jude Donor '04
I believe so, I'm getting ready to put power on my project car soon which not only has new bags and an SDM but also a new BCM as well as all other modules.
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Safety Car
Joined: Aug 2000
Posts: 4,933
Likes: 30
From: San Rafael CA
Display codes
Display the codes .... go heere if you don't know how to do it ...
https://www.corvetteforum.com/techti...D=26&TopicID=1
I'll bet $20.00 you have a B1001 DTC set in the SDM ... along with possibly some others.
Post the codes ....
https://www.corvetteforum.com/techti...D=26&TopicID=1
I'll bet $20.00 you have a B1001 DTC set in the SDM ... along with possibly some others.
Post the codes ....
Safety Car
Joined: Aug 2000
Posts: 4,933
Likes: 30
From: San Rafael CA
.......
I came across something in the service manual the other day when I was looking up an SDM code for someone else and I saw that the SDM communicates with the BCM every time the car is started (this makes sense) what I didn't realize is the process also involves the PCM, on startup the SDM and BCM communicate a code which is the last 4 digits of the SDM part number and then the BCM and PCM communicate to each other the VIN stored in each computer if these don't match up the air bag light will illuminate and throw the code that I looked up (I'll have to go back and look to see which code it was???)
I came across something in the service manual the other day when I was looking up an SDM code for someone else and I saw that the SDM communicates with the BCM every time the car is started (this makes sense) what I didn't realize is the process also involves the PCM, on startup the SDM and BCM communicate a code which is the last 4 digits of the SDM part number and then the BCM and PCM communicate to each other the VIN stored in each computer if these don't match up the air bag light will illuminate and throw the code that I looked up (I'll have to go back and look to see which code it was???)
You need to perform two steps with a Tech2 to clear this code ...
1) Program VIN into the SDM
2) Program PROM ID into the BCM
The PROM ID is a 4 digit number that is supposed to be on a label on the SDM, but you can read it from the SDM with the Tech2 if you've already installed the SDM in the dash and don't want to take it back out.
Safety Car
Joined: Aug 2000
Posts: 4,933
Likes: 30
From: San Rafael CA
BCM - Body Control Module
These are two of several computers in the car that communicate with each other on a serial data link.
The SDM controls the SIR (airbag) system, and in a deployment the SDM has to be replaced as it is permamnently "locked" with the last 5 seconds of certain vehicle data before the deployment.
The BCM controls certain functions such as the cars Security and Lighting systems. It contains certain vehicle data (such as the VIN) that at vehicle start is compared with other computers in the car to be certain that the "correct" computers are in the car. If, for example, the BCM and PCM VIN don't agree, the BCM will, through the PCM, prevent the car from being driven. The PCM is the Powertrain Control Module, the computer that controls the engine and transmission (if it is an automatic).
Safety Car
Joined: Aug 2000
Posts: 4,933
Likes: 30
From: San Rafael CA
SDM - The SDM contains a decelerometer that calculates if vehicle is decelerating faster than certain pre-programmed parameters. If the vehicle is slowing faster than the parameters, the SDM fires the airbags. The SDM has its own short term power storage capability so that if the vehicles electrical system is damaged during a wreck, the SDM still has the power to deploy the bags.
On cars equipped with ACTIVE HANDLING (RPO JL4) there are two sensors - a yaw sensor and a lateral accelerometer. These have nothing to do with the airbag system, and only need be replaced if they have ceased to function. These two sensors are located in the cabin of the vehicle. DTCs will be set if either/both of these are inoperative. If they fail, ACTIVE HANDLING is turned off, but the vehicle is driveable.
Melting Slicks
Joined: Oct 2006
Posts: 2,343
Likes: 64
From: Cincinnati Ohio
air bags
my active handling idiot light always stays on as well as the airbag light. The DIC doesn't show a malfunction. If I press the active handling button on the console, the DIC will display that it has been disabled or active if turned on, but the idiot light is always on? Thanks for all the help!
Safety Car
Joined: Aug 2000
Posts: 4,933
Likes: 30
From: San Rafael CA
my active handling idiot light always stays on as well as the airbag light. The DIC doesn't show a malfunction. If I press the active handling button on the console, the DIC will display that it has been disabled or active if turned on, but the idiot light is always on? Thanks for all the help!
https://www.corvetteforum.com/techti...D=26&TopicID=1
The Tech2 is VERY expensive (about $5,000 new), so only a handful of non-GM shops/people have one.
However, on a C5 we have the unique ability to learn a lot about what is wrong with the car by following the procedure above. A "poor man's" Tech2, if you will. A lot can be learned/fixed by displaying DTC info from the car. But, some functions such as programming the VIN in the SDM can only be done with a Tech2
Racer
Joined: Jun 2005
Posts: 474
Likes: 0
From: Sierra Vista AZ
sorry for the hijack, I don't have a lot of faith in my local dealer. With me having an aftermarket tune, would I have to worry about the dealer messing w/ the tune, when they attemt to reset the sdm,and bcm?
