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Is My Head Unit Fried?
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<blockquote data-quote="keep_hope_alive" data-source="post: 8670543" data-attributes="member: 576029"><p>a spark would be an issue if the memory pin touched the head unit chassis. not only would that likely blow a fuse but it would also put 12V on the HU chassis, which can damage internal circuits. it matters what it sparked against. </p><p></p><p>if the pin is not fully inserted in the harness, it won't make contact with the HU pins, and the HU won't turn on. likewise, if the pin opening is too big, it might not make contact with the HU pin.</p><p></p><p>confirm you're measuring voltage at the harness between the yellow (+12V) and black (gnd) wires. you'll have to measure from the back of the harness because the HU side has openings that are too small for a DMM probe. </p></blockquote><p></p>
[QUOTE="keep_hope_alive, post: 8670543, member: 576029"] a spark would be an issue if the memory pin touched the head unit chassis. not only would that likely blow a fuse but it would also put 12V on the HU chassis, which can damage internal circuits. it matters what it sparked against. if the pin is not fully inserted in the harness, it won't make contact with the HU pins, and the HU won't turn on. likewise, if the pin opening is too big, it might not make contact with the HU pin. confirm you're measuring voltage at the harness between the yellow (+12V) and black (gnd) wires. you'll have to measure from the back of the harness because the HU side has openings that are too small for a DMM probe. [/QUOTE]
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