GMC Troubleshooting Questions? Ask a Mechanic for Answers
No scan tool communication? Or are there warning lights on the dash that indicate a problem?
I'm sorry, I got called away from my desk after I responded to you.
What are you using for a scan tool? If you try to read airbag data, does it say no communication, or no data available?
OK, I am researching now, give me a few minutes.
There are two airbag fuses, both are labeled AIRBAG, one is in the IP fuse block, and one is in the underhood fuse block. You said you checked all fuses, but I want you to specifically check these two, with a test light, and see if power is present on both sides of each fuse.
OK, the ground side is next, you'll need to access the airbag module, and check for ground on pin 1. While there, also check for power on pin 31 and 32, just to make sure that power and ground is actually reaching the module.
Yes, here is a diagram.
OK. You programmed the new module, yes?
When you turn the key on, what does the airbag light on the dash do?
Are the other modules setting codes for "no communication with SDM"?
Body control should definitely be setting a code, I would think. It's clear that the SDM isn't communicating. You have power and ground, the only thing left to check is the integrity of the data circuits.
But one more thing before we go that way: I have run into issues with these sliding lock connectors. Is that plastic connector damaged in any way? Did anyone break it trying to disconnect the SDM? If it's not working right, the connector won't engage the pins of the SDM, and it will be like it's not even there, but the connector appears to be attached just fine. Spend a few minutes with it and make sure that connector is working the way it should, and engaging those pins.
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