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The official Alpine W505 thread
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<blockquote data-quote="shadowjack1965" data-source="post: 6053180" data-attributes="member: 611715"><p>JLUV,</p><p></p><p>I think you're right, the guy on eBay I bought the TR-7 from said this:</p><p></p><p>"That gm21sr is not going to work on the alpine. The pioneers need 2 pulses on one brake wire where the alpine need multiple pulses on 2 brake wires..."</p><p></p><p>The GM21SR is Scosche's version of the GMOS-LAN-01 (which is I believe Metra's part number). This device allows installers to bypass having to hook up the parking brake and speed sensor wire as the connections are routed through this part. These units are usually needed in late model cars that use OnStar or are wired for OnStar.</p><p></p><p>Thanks for your feedback!</p></blockquote><p></p>
[QUOTE="shadowjack1965, post: 6053180, member: 611715"] JLUV, I think you're right, the guy on eBay I bought the TR-7 from said this: "That gm21sr is not going to work on the alpine. The pioneers need 2 pulses on one brake wire where the alpine need multiple pulses on 2 brake wires..." The GM21SR is Scosche's version of the GMOS-LAN-01 (which is I believe Metra's part number). This device allows installers to bypass having to hook up the parking brake and speed sensor wire as the connections are routed through this part. These units are usually needed in late model cars that use OnStar or are wired for OnStar. Thanks for your feedback! [/QUOTE]
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