Quote:
Originally Posted by SD1too
I would like to know how exactly the CAN bus is involved in the operation of the HRW.
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Thank you very much Phil for your clear and concise answer to my question.
So it's the "engine running" signal which the ECM sends on the CAN bus which is necessary for the HRW to operate*. That's virtually the same principle used on my 34 year old SD1 so well done
cb750Chris for spotting it. All the talk about fuel burning heaters and external temperature sensors was unfortunately irrelevant to the problem, but interesting nonetheless.
Simon
* Located in RAVE Air Conditioning, Description & Operation 82-25: "
Rear window heater switch: Enabled while the engine is running".