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Metra OY-INGM1 aftermarket radio wire harness interface for select GM models. When replacing the OEM radio with an after market radio some feature are lost, with this interface most of those features are retained. This …Comparison shop for Metra wm gm29 swc gm radio interface, Antenna Kit Car Audio / Video Accessories in Electronics. See store ratings and reviews and find the best prices on Metra wm gm29 swc gm radio interface, Antenna Kit Car Audio / Video Accessories with Shopzilla's shopping search engine.Connect the appropriate GM29-SWC harness to the GM29-SWC interface. and then to the vehicle connectors that were removed from the factory radio. As soon as you plug the vehicle connectors into the vehicle’s harness move to step 3, programing the interface is a time sensitive process.Note: The relay attached to the AX-GMLAN29-SWC harness is only for audible turn signal clicks. No extra steps are required to retain this feature, so leave the relay as-is. Continue to 3.5mm jack steering wheel control retention Attention! This interface will work with models that are either non-amplified, analog amplified, or digital amplified.Find many great new & used options and get the best deals for Metra WM-GM29-SWC at the best online prices at eBay! Free shipping for many products! Metra WM-GM29-SWC 86429381920 | eBayThis black Metra radio interface has a universal design for use with most 2006-up GM automobiles. Compatible with most 2006 and later General Motors vehicles. For a customized fit. Connects aftermarket radio to …Metra WM-GM29-SWC GM Radio Interface. 14 3.4 out of 5 Stars. 14 reviews. Available for Pickup or 3+ day shipping Pickup 3+ day shipping. Scosche GMT2049A-WM1 Stereo Install Dash Kit Compatible with1992-Up General Motors. Best …Jun 25, 2014 · The app will auto-detect the interface, scan the current firmware, and allow the user to force update if necessary. The app offers advanced functions for dealers and technicians. 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