w123:cruise [wiki]

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  * [[http://www.peachparts.com/shopforum/tech-help/315339-inside-box-vdo-cruise-control-actuator.html|Actuator testing and disassembly]]

===== Cruise Control =====
==== Cruise Control Amplifier ====
  * [[http://www.peachparts.com/shopforum/diesel-discussion/123036-cruise-control-repair-articles.html#post883130|A ton of links]]
  * [[http://forums.pelicanparts.com/porsche-911-technical-forum/394659-understanding-vdo-cruise-control-amp.html|Schematic to same or similar amp]]
  * There's some talk that replacing the LM2901n quad comparator is the next step for shotgun approach if replacing the electrolytic caps doesn't fix. This [[http://forums.pelicanparts.com/porsche-911-technical-forum/394659-understanding-vdo-cruise-control-amp-2.html|helped at least one person]] with a surging issue on their amp.

==== DIY ====
  * [[https://www.youtube.com/watch?v=l0A8OiNk4Hw|very basic implementation on a Nissan]]. Doesn't use PID and missing some safety mechanisms