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Author Topic: Aircon wiring Q  (Read 1687 times)

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Doctor Gollum

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Aircon wiring Q
« on: 28 June 2021, 15:08:42 »

Got a head scratcher...

The BkWh wire that runs from the Climate panel to the pressure switch and onto a fan relay then into the engine ecu.

What polarity is it at the engine Ecu and if positive, what voltage?
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Re: Aircon wiring Q
« Reply #1 on: 28 June 2021, 16:14:51 »

It goes:

U28 - 15 X63 (climate panel)

4 X58 (plug under battery)

2S20 via low pressure switch, through high pressure switch and out 1S20

4 X30 (9 pin plug in relay box)

41 K61 (engine ecu)

Basically, the system looks to be self sufficient, like the fans, but I need to bypass the engine ecu.

There are two other wires involved, but they are both fed from  F15, so obviously ground out through the engine ecu.
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Re: Aircon wiring Q
« Reply #2 on: 28 June 2021, 18:59:42 »

Have established that it does indeed also ground out through the engine ecu.

Still not working, but have possibly ruled it down to either of the aircon sensors and/or charge quantity as all of the wiring is intact except for what might happen electronically within the engine ecu on the way to ground :-\
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