Simon_CSK Posted April 9, 2020 Share Posted April 9, 2020 Have taken the dash out and in the process of reinstalling and how have 2 HEVAC contollers that don't illuminate or work. Can I test them off the car? Are they coded to the car? Quote Link to comment Share on other sites More sharing options...
David Sparkes Posted April 9, 2020 Share Posted April 9, 2020 5 hours ago, Simon_CSK said: ... have 2 HEVAC contollers that don't illuminate ... Sorry if you think I'm being cheeky, but the illumination is via a single 12v bulb; have you removed it and checked if it works? (Times two, obviously). 5 hours ago, Simon_CSK said: ... . Can I test them off the car? Are they coded to the car? Don't know without studying the ETM (which I don't propose to do), and No. Regards. Quote Link to comment Share on other sites More sharing options...
Simon_CSK Posted April 9, 2020 Author Share Posted April 9, 2020 David Understand why you would ask if the bulbs were working and that was my first check, the bulbs were checked with a multimeter. Quote Link to comment Share on other sites More sharing options...
David Sparkes Posted April 9, 2020 Share Posted April 9, 2020 OK. I'm still flying by memory. The two failure modes I recall were total lack of display, equals bulb, and failure of individual elements, which was slight corrosion on the edge connectors of the display panel itself, cured by cleaning with a 'pen' containing tightly packed 'glass' bristles, and or physical packing of the edge connectors in their slots (slice of thin card?). As the HEVAC display IS the HEVAC control, there is no separate ECU, I'd want to check the power supply via the multipin plugs, and I think I'd do this via a 12v supply, whether in the car of on the bench, rather than resistance checks. Obviously one has to be a bit cany, not to thrust 12v on pins that are not designed to accept it. The other aspect of this unit that I recall was that it has no fault memory. If it showed an error then when power cycled it started again from scratch, working OK until it hit the fault condition. In my eyes this makes it easier to fault that the SAS? system (airbags etc). Regards. Quote Link to comment Share on other sites More sharing options...
Simon_CSK Posted April 28, 2020 Author Share Posted April 28, 2020 The HEVAC is now working but there isn't any display so will order a bulb kit for it. Quote Link to comment Share on other sites More sharing options...
Simon_CSK Posted May 4, 2020 Author Share Posted May 4, 2020 That's new bulbs in and everything is working as it should. Now I can put the dash back together 2 Quote Link to comment Share on other sites More sharing options...
Escape Posted May 4, 2020 Share Posted May 4, 2020 On 4/28/2020 at 6:24 PM, Simon_CSK said: The HEVAC is now working but there isn't any display so will order a bulb kit for it. What did you do to fix it? Bad connection somewhere? Quote Link to comment Share on other sites More sharing options...
Simon_CSK Posted May 4, 2020 Author Share Posted May 4, 2020 Just now, Escape said: What did you do to fix it? Bad connection somewhere? Nothing it just started working. When I tried the second unit with new bulbs that one too was working. Now am putting the dash back together. Hopefully by the end of the week the car will be running perfectly and on LPG to boot. Quote Link to comment Share on other sites More sharing options...
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