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Firstly the top two or three lines are aerials not part of the HRW :)
You can check it with a voltmeter see if you are getting 12v one side and a good earth the other, it will only work with the engine running and if the battery state is poor it will switch it off to allow better battery charging.
Common faults are wires braking in the rubber sleeve by the tailgate hinge
Fixedwheelnut
Also @Fixedwheelnut and other knowledgeable e46 people.
Rear heating element seems to not be working. What’s the process for troubleshooting? Weirdly half of one bar at the very bottom seems to be half working. Hope I didn’t bodge the ribbon connection when doing the rear washer jet 😬
Also hoping there’s some simple check/fix that doesn’t need the removal of that bit of trim above the rear windscreen - the clips are just begging to break whenever you try and take it off.