[Ovmsdev] HUD Connected to OVMS not working
frog at bunyip.wheelycreek.net
Sat Oct 15 07:15:49 HKT 2022
Anybody got any experience with HUDs?
I bought this simple HUD from FastTech:
When connected direct to the OBDII port, it powers on and seems to
function. When I connect it to the OVMS module with the standard
https://www.fasttech.com/products/9652027 the HUD doesn't even power on.
It's stated draw is 200ma which afaict should be fine. I'm pretty sure the
12V power is getting to PIN 16... though I will try again to make sure. I
only have a crappy little Multimeter.
On the Troubleshooting it states:
"HUD only available for cars with OBD2 and EU-OBD agreements ... HUD
Products don't support JOBD and OBDI protocol."
The OBD HUD connector has the following pins:
5* Signal Ground
6 CAN High
7 *ISO9141 K Line*
14 CAN Low
15 *ISO9141 L Line*
16 Vehicle Battery +ve
* Long pins
These are the standard OVMS supplied pins:
4 Chassis Ground
5 Chassis Ground
6 CAN H (Primary)
14 CAN L (Primary)
So obviously the main difference is the lack of K / L lines in the OVMS ...
but I wouldn't have thought that would have prevented it from powering up.
Does anybody have any thoughts on this?
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