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The BMW Range
3 Series
E46
Central Locking Kaput..
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<blockquote data-quote="scottjoh" data-source="post: 448166" data-attributes="member: 20804"><p>Regarding the solid state relay project. <a href="http://www.bmwgm5.com/SolidStateRelays.htm" target="_blank">http://www.bmwgm5.com/SolidStateRelays.htm</a> Yes, I know current flows in both directions. I'm not an idiot. The MOSFETs are arranged in an H-Bridge configuration with each of my modules forming one side of the H-Bridge. The 2nd line of my project page says I got it <strong>working</strong> 14 months ago. Not a difficult project.</p><p></p><p>The problem with relays, as you probably already know, is the relays wear out and go bad! A solid state solution is far more reliable and won't wear out. BMW uses a solid state circuit to drive the front door lock actuators on the E38 (7-series) and E39 (5-series). While the 5 and 7 get more reliable and more expensive solid state circuits we get crappy relays. Do you know how many V23084 relays I've replaced, A LOT. </p><p><img src="http://www.bmwgm5.com/Images/Relay_Pile.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p>Know how many E38/E39 modules I've worked on with door lock problems? 0.</p></blockquote><p></p>
[QUOTE="scottjoh, post: 448166, member: 20804"] Regarding the solid state relay project. [url]http://www.bmwgm5.com/SolidStateRelays.htm[/url] Yes, I know current flows in both directions. I'm not an idiot. The MOSFETs are arranged in an H-Bridge configuration with each of my modules forming one side of the H-Bridge. The 2nd line of my project page says I got it [B]working[/B] 14 months ago. Not a difficult project. The problem with relays, as you probably already know, is the relays wear out and go bad! A solid state solution is far more reliable and won't wear out. BMW uses a solid state circuit to drive the front door lock actuators on the E38 (7-series) and E39 (5-series). While the 5 and 7 get more reliable and more expensive solid state circuits we get crappy relays. Do you know how many V23084 relays I've replaced, A LOT. [IMG]http://www.bmwgm5.com/Images/Relay_Pile.jpg[/IMG] Know how many E38/E39 modules I've worked on with door lock problems? 0. [/QUOTE]
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