HUD Installed - SDM No Comms Problem
Thread Starter
Instructor
Joined: Feb 2000
Posts: 100
Likes: 2
From: Toms River NJ
HUD Installed - SDM No Comms Problem
I just installed an HUD motherboard and other parts in my 98 Vette. Everything works fine, but when I went to check/clear the codes on the DIC, I get 'SDM No Comms' message. This has something to do with the air bag system, but the air bag light on the left blinks seven times as it's supposed to. I have a passenger side air bag shut-off switch that I had installed a long time ago and that seems to work properly also.
I was wondering if anyone has come across this problem and/or knows how to fix it.
Thanks!
I was wondering if anyone has come across this problem and/or knows how to fix it.
Thanks!
Safety Car
Joined: Dec 2004
Posts: 3,526
Likes: 20
From: Santa Fe TX
I think SDM is the Airbag. Forum Name suggests you have a 98 model. Did you swap the cluster for a newer HUD cluster? If so it will not communicate with the Airbag Module from a 98. It was called SRS on 97-99 right?
Another Thread on this issue:
http://forums.corvetteforum.com/c5-t...comm-help.html
Another Thread on this issue:
http://forums.corvetteforum.com/c5-t...comm-help.html
Thread Starter
Instructor
Joined: Feb 2000
Posts: 100
Likes: 2
From: Toms River NJ
I just looked at the link in your post and according to that, this is normal.
Original cluster with newer motherboard. Everything seems to work correctly except for the 'SDM - No Comms' which might be normal for this year swap. I have someone else with a 98 who is going to check if he has the same thing (he never checked it before).
Original cluster with newer motherboard. Everything seems to work correctly except for the 'SDM - No Comms' which might be normal for this year swap. I have someone else with a 98 who is going to check if he has the same thing (he never checked it before).
Last edited by NINETY8; Jul 9, 2009 at 02:52 PM.
Team Owner
Joined: May 2001
Posts: 36,836
Likes: 244
From: Dear Karma, I have a list of people you missed.
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16
I think SDM is the Airbag. Forum Name suggests you have a 98 model. Did you swap the cluster for a newer HUD cluster? If so it will not communicate with the Airbag Module from a 98. It was called SRS on 97-99 right?
Another Thread on this issue:
http://forums.corvetteforum.com/c5-t...comm-help.html
Another Thread on this issue:
http://forums.corvetteforum.com/c5-t...comm-help.html
Have you tried to reset the DTC using the DIC? Comm codes have a "U" prefix. Is there a "C" or "H" suffix letter on the DTC code?
Thread Starter
Instructor
Joined: Feb 2000
Posts: 100
Likes: 2
From: Toms River NJ
That's the problem, there is no code and if I push the 'Reset' button, it clears and then returns with 'No Comm', which I think means no communication with that (SDM) module. If the module doesn't exist as stated in the other post, I'm guessing that might be normal.
I just double checked it and I get '58 - SDM' and about a second later it adds the 'No Comm.' remark. There is no 'U', 'C' or 'H' in the message.
I just double checked it and I get '58 - SDM' and about a second later it adds the 'No Comm.' remark. There is no 'U', 'C' or 'H' in the message.
Last edited by NINETY8; Jul 9, 2009 at 06:43 PM.
Team Owner
Joined: May 2001
Posts: 36,836
Likes: 244
From: Dear Karma, I have a list of people you missed.
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16
That's the problem, there is no code and if I push the 'Reset' button, it clears and then returns with 'No Comm', which I think means no communication with that (SDM) module. If the module doesn't exist as stated in the other post, I'm guessing that might be normal.
I just double checked it and I get '58 - SDM' and about a second later it adds the 'No Comm.' remark. There is no 'U', 'C' or 'H' in the message.
I just double checked it and I get '58 - SDM' and about a second later it adds the 'No Comm.' remark. There is no 'U', 'C' or 'H' in the message.
Btw, I just checked and the SDM in the '97-'98s share the same part number but the '99s are different, and starting in 2000 the part numbers changed again.
Last edited by LoneStarFRC; Jul 9, 2009 at 07:25 PM.
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Thread Starter
Instructor
Joined: Feb 2000
Posts: 100
Likes: 2
From: Toms River NJ
The SDM module is underneath and slightly behind your HVAC panel, so you HAVE an SDM (Sensor and Detector Module). It may not be communicating with the IPC (as someone else suggested), when it runs a self-test on startup. The SDM is the "main brain" of the SIR system that commands the air bags to deploy (or not to deploy) in an accident.
Btw, I just checked and the SDM in the '97-'98s share the same part number but the '99s are different, and starting in 2000 the part numbers changed again.
Btw, I just checked and the SDM in the '97-'98s share the same part number but the '99s are different, and starting in 2000 the part numbers changed again.
