This page documents the process for diagnosing a failed GND fuse in the the siliXcon SL motor controller used in CAKE Kalk and Osa. The guide is written for Kalk, as part of the Kalk inoperable troubleshooting guide, but it should also apply to Osa.
This content was kindly put together and shared by Barry (@insitedesign on the CAKE Riders Club Discord).
¶ Testing for failed GND fuse
There are two methods to test for continuity of the GND microfuse.
Note that the LED status indicator on the controller may suggest all is well, even if the GND fuse has failed. To be certain, always check for continuity.
¶ Method 1
For CAKE Kalk, one option is to follow the steps in this original service PDF: CAKE Kalk - Check Microfuse (PDF)
¶ Method 2
This option is the most accurate test for a failed GND in the controller (and applies to both Kalk and Osa).
With the battery removed from the bike and 10 minutes of time elapsed to allow remaining current to discharge, remove the cover from the face of the controller box and pull the controller out far enough to unclip/disconnect the AMP wiring harness.
Using a multimeter, test for continuity between the blue -Batt wire at the controller and the #6 (GND) pin. (See the pinout for more detailed information.)
- Continuity = good controller
- No continuity = bad controller
¶ Resolutions
Bad news, good news.
If the GND fuse in the controller has failed, you can get the controller repaired with siliXcon for a reasonable repair cost.
You should first start a service ticket with siliXcon via https://silixcon.com or by emailing [email protected] so that they can confirm it has failed. They might ask you to run a diagnostic via the SWTools software. (Note that siliXcon is a commercial company that suggests they are for manufacturers and “enthusiasts” (people who tinker) but NOT general consumers, so you may have to be ready to do some work or take the route of replacing via a retailer like Cakeservice.co.)