Car won't start without air conditioning controls plugged in
Hi all. Doing some audio tinkering I tried turning the car on to run a quick test - I had the 2 panels in the centre console unplugged - audio and air conditioning. Engine would not turn on, no new faults reported on screen. I think I missed a heartbeat there. Fortunately, as soon as I reconnected the climate panel, engine started fine.
My question is - why?
27th Aug 2023 5:16 pm
DSL Keeper of the wheelie bin
Member Since: 11 May 2006
Location: Off again! :-)
Posts: 73085
ISTR the canbus runs through the AC controls. No AC unit = no CANBUS = no running.
I may be wrong, it has been known. Alegedly.
27th Aug 2023 5:45 pm
Disco_Mikey
Member Since: 29 May 2007
Location: Dundee, Scotland
Posts: 20841
Derek is correct (this time )
HVAC is part of the HS CAN network. When that goes down, the car won't start My D3 Build Thread
Thanks. I was reading the wiring diagrams and they do mention the ECM but it's not clear to what end, other than the coolant temperature which I did not know was related to the ac.
In any case it's good to know. Random thing to be aware of.
HVAC is part of the HS CAN network. When that goes down, the car won't start
The one and only Disco Mikey. Tried contacting you on FB messenger. Would love to make the trip to Dundee sometime you have a slot.
27th Aug 2023 8:15 pm
Sidestick
Member Since: 22 Apr 2012
Location: Rome
Posts: 2323
From what described in the "module communication section", the HVAC is part of the "medium speed" communication network (not the High speed where the Engine Control Module resides), so IMHO the issue is not related to CAN communication, but surely someone will explain it better than me - Easy-Lift suspension module 4.0
- GoodWinch 9500 lb
- Full underbody protections
- Tree/Rock sidebars
- Prospeed roofrack & ladder
- Compressor guard
- Raised Air Intake
- Driving lights (2+4)
- 50 mm Waffle boards
- Altox Heater control
- Overland Rooftop Tent
- Rear seats entertainment
- Front & Rear camera
- GVIF
- Removable tow bar
- Cubby box fridge
- BFG KO2 265/65R17
- iidTool BT
Last edited by Sidestick on 28th Aug 2023 4:58 pm. Edited 1 time in total
28th Aug 2023 2:25 pm
Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10683
It’s on both networks isn’t it ?
28th Aug 2023 4:06 pm
Sidestick
Member Since: 22 Apr 2012
Location: Rome
Posts: 2323
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No climate control around High Speed Can
Medium and High Speed cans are wired separated...- Easy-Lift suspension module 4.0
- GoodWinch 9500 lb
- Full underbody protections
- Tree/Rock sidebars
- Prospeed roofrack & ladder
- Compressor guard
- Raised Air Intake
- Driving lights (2+4)
- 50 mm Waffle boards
- Altox Heater control
- Overland Rooftop Tent
- Rear seats entertainment
- Front & Rear camera
- GVIF
- Removable tow bar
- Cubby box fridge
- BFG KO2 265/65R17
- iidTool BT
28th Aug 2023 4:47 pm
Disco_Mikey
Member Since: 29 May 2007
Location: Dundee, Scotland
Posts: 20841
MrNicotra wrote:
Disco_Mikey wrote:
Derek is correct (this time )
HVAC is part of the HS CAN network. When that goes down, the car won't start
The one and only Disco Mikey. Tried contacting you on FB messenger. Would love to make the trip to Dundee sometime you have a slot.
There is a good chance I missed it, between Messanger, our FB business page, emails, texts, WhatsApps, and this very forum, it's a struggle keeping up with it all
Feel free to ping another message over, I'll keep an eye out for it My D3 Build Thread
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