Topic: OBDLink MX to Diagnose late-model GM Airbags [SOLVED]

[jozsefsz]

Hi, I recently purchased an OBDLink SX and ScanXL Standard with the Enhanced GM Add-On.  I am attempting to diagnose an airbag fault on a 2009 Chevrolet Impala LT w/3.5L Flex-Fuel.  To my dismay the software/hardware combination does not appear to be able to connect to the Restraint Module in my car.  All other modules (Engine, Transmission, Trac-Control / ABS) appear to connect correctly.

Additional research on this forum and elsewhere leads me to believe that late-model GM vehicles have the Airbag module connected to the low-speed SW-CAN (Single-Wire CAN) and that the OBDLink SX would not be able to scan SW-CAN modules.

Has anyone had success switching to the OBDLink MX?  The product information states that it supports SW-CAN, and a few older forum posts indicate other users giving it a try, but no firm success message or confirmation.

I'd greatly appreciate your input and experiences, as this will determine whether or not I simply ask for a refund or upgrade to the OBDLink MX.  ScanTool.net Sales suggested I post here, as they were unable to verify whether or not the MX would help me do what I'm hoping to do.

[Shawnf350]

If the restraint module fails to connect using year and model of car in scan xl, I would agree that it's the need of SW-CAN capability.  I cannot confirm that it would definitely work for that vehicle but don't see why it wouldn't.  I use the MX mostly and haven't had any problems connecting with Fords or GMs with scan xl.  (Various modules)
I would swap it for an MX. 

Shawn

[Chris Fincher]

Hi,

I found similar results to what you stated; the airbag module does seem to be on the GMLAN (SW CAN) network.  This being the case, I agree fully with Shawn that you should swap it for an SX.  Sales will contact you about your question via email or eSupport.

Regards,
Chris

[jozsefsz]

Thank you both, I'll post back here with the results when the MX arrives.

[jozsefsz]

The results are in...  within 10 minutes of my MX arriving I had it connected to my Dell D620 laptop, and ScanXL with the GM Enhanced Add-On installed as well.  Created new vehicle entry, switched to Restraints Module diagnostics, and BAM!  My B0021 code is displayed.

Googled B0021 on Impala, disconnected & reconnected under-seat side-curtain airbag connectors (after shutting off, disconnecting battery, waiting 15 minutes, etc.), restart and airbag light goes out.  Cleared the stored code for good measure.

Worked perfectly, thanks to everyone who posted and to ScanTool sales (great customer support on my SX return as well).  Already saved me $100 and a few hours for a trip to the dealer just to tell me what was wrong.  Now my only problem is my relatives who want to come over for me to scan their cars as well!

Verified:  OBDLink MX with ScanXL Standard & GM Enhanced Add-On was able to read & clear airbag codes from a 2009 Impala.  Very happy customer.