Just upgraded my `98 coupe with HUD...replaced cluster and added all the goodies
The car had No codes or issues prior to the upgrade..Now I have;
"058 SDM NO COMM"

I`m thinking I left something disconnected? or maybe my car doesn`t have whatever this module is?

Any Help would be appreciated!

 

I've been looking through my GM service manual and couldn't find SDM.
Are you sure it's not SCM?

 

Rocknroll, Thanks for taking the time to look in your manuals...I keep telling myself I need to spring for a set!!!

Doing a few searches...it has been reported that after replacing the cluster on an early C5 to upgrade to a HUD enabled Cluster...Several members have reported this Code. (058-SDM NO COMM)
SDM is the sensing and diagnostic module tied into the airbag system.
When performing the upgrade, it is nessesary to move the airbag indicator bulb from one position on the cluster to the earlier C5 position or it would remain on. When first powering up the car, the airbag indicator lite flashes several times and goes out normally. The car shows no other issues and no other DIC Codes have been set.
If anyone else has anything else they can add... please do so!!

 

Hey Larry, give me a call I'll let you borrow my service manual

 

Rob, thanks!! Might just do that...Lets see if anyone else has run across this issue....

 

Larry,
There's alot of info on the SDM in the service manual.
It has several system checks you can perform, too many to list.
I would suggest you take Rob up on his offer.
It's located behind the center of the instrument panel, under the HVAC control head.
I see a 358 but no 058.
Exactly what is it doing? When you turn the key on is it flashing seven times or staying on solid?

 

the Airbag Idicator lite flashes several times then goes out...like normal...after the HUD install I did a DIC code check...just out of curiosity...and found the 058-SDM code

 

Ok....why would the airbag lite flash the 7 times and go out signifying normal operation when there is NO COMM to the SDM?

 

Sometimes a code is set when you unplug a connector.
Why don't you clear the code and see if it comes back?

 

Yea I thought of that...I tried resetting but it instantly comes back...its not a History code. I was looking at the trouble shooting chart in the service manual and other than hooking up a scanner...everything checks normal... It`s got to be a difference between the newer Cluster and the older C5 system, meaning the newer cluster is looking for something that the older system doesnt have.

 

Hopefully an "upgrade" guru will see your thread and help you out.

 

i believe the difference between the clusters has to due with the wiring to the cluster.if you said that the light[airbag]flashes 7 times and goes out[it shouldn't do that].if you turn the key on[engine off],the light should stay on for a couple of seconds and go off[self check].it almost sounds like the airbag lamp and seat belt warning light is crossed.
if you had no "communication" with the sdm,the airbag lamp should be on solid.
if you still have the old cluster,compare the indicator lights on the old one to the new one[make sure the indicators are all in the same spot],if
they are different,chances are the wiring is different[the only way to know would be to compare wiring diagrams].
my car is a 03,so my seat belt light may work differently[it stays on until i hook in the belt].i haven't ever looked at the way the older cars worked[they may flash and go off without hooking up the belt],so i wouldn't really know the answer to that,but the guys here with the older cars would know.
with the key on[engine off],pay attention to all the indicator lights and see if any of them other than the airbag lamp are acting weird[security,traction control,etc].
note:my car is not here right now,so i can't compare,but i don't recall
my airbag lamp flashing and going out.

 

dpd, thanks for the reply!
According to the service manual...the airbag indicator lite SHOULD flash 7 times...that means it passed the self test. I do agree.... if it definitly was not communicating with the SDM the airbag lite should be solid on all the time indicating a problem. The newer cluster airbag lite had to be relocated to an empty socket which corresponds with the position of the older cluster. Interesting though...the seatbelt lite doesn`t lite up at all....I will pull the cluster tommorrow and look at that....it is in the same position on both clusters!

 

i just came back from my car.the airbag light does flash 7 and go out[i couldn't remember],so i recant that statement.i still think something is crossed somehow.

 

im resurrecting this thread

did anyone ever figure out a solution to this issue?

I took out my hud cluster and swapped the main boards out of it into my old cluter so the wiring would be the same to see if this would eliminate the 58sdm no comm. and it did not

I cant seem to find alot of info on this

anyone ever find a solution?

 

I hate to say this....but I`m still waiting since my first post in January!!

 

the NO comm Means the system is not communicating.
You put a HUD in could you of crushed a wire inside. Have you tried to go into codes with car running. The pcm is not seeing the SDM module. I think you need to go thru the connections and look for damaged wire's.

 

Thanks for the reply...but as stated at the beginning of this thread, Many members have reported the same code after a HUD upgrade, so a crushed wire is not an issue. The PCM Does see the SDM and allows a self test as normal.

 

Ill open my online service manual and get you a report in a few.

 

have you ever gotten a B1071 code?