Metal Posted December 30, 2019 Share Posted December 30, 2019 A week or so ago I installed a new headunit in my car, a Pioneer AVH W4500NEX (wireless Android auto is awesome). I've done this a couple times before in this car so I didn't expect any difficulty. However, immediately after the installation the SRS airbag warning light came on on my dash. It would either come on right when I start the car and stay on, or it would turn on after 15-20 minutes of driving. I read the codes and got 21 (airbag ecu failure) and 26 (passenger airbag indicator failure). After a reset they would come back and this went on for a few days while I was freaking out about how much this would cost me. I realized that the only thing I did different this time around was that I disconnected and removed the factory Sirius radio module that was underneath the headunit. I have the factory HK speaker system that came with Siruis. I took it out because it was just sitting there and I knew I would never use it. Thinking that maybe this caused some electrical gremlins I connected it back up and popped it in the same spot it was before. The warning light went away and all had been well for a couple days now. I never as much as touched any airbag harness connectors. I have no idea why removing this module caused that issue but I thought I'd post it here in case someone else runs into a similar issue. Link to comment Share on other sites More sharing options...
dgoodhue Posted December 30, 2019 Share Posted December 30, 2019 I think you need discard the wiring adapter that came with it and factory plug the harness in directly. Part E on this instructions is what I think needs to be removed. https://www.subarupartsdeal.com/resources/installation/SPD/18_072642-063778-h621saj100.pdf Link to comment Share on other sites More sharing options...
Metal Posted December 30, 2019 Author Share Posted December 30, 2019 Good find. If I'm ever back in there I'll give it a shot. For now though I don't actually need it removed, so as long as there's no warning lights coming on I'll leave it alone. Link to comment Share on other sites More sharing options...
Infosecdad Posted December 30, 2019 Share Posted December 30, 2019 There is a wire that goes to the airbag warning light, if it's not connected, then the whole system shuts down for safety reasons. I would bet that it just flows through that connection most likely. Link to comment Share on other sites More sharing options...
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