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Posted on Feb 20, 2009
Answered

1992 Lexus SC400 No Heat, AC, Defrost (mode controls)

The problem:
1992 Lexus SC400
I was running the car with the heat blowing and I plugged in my 12v Garmin GPS into the cigarette lighter. The heat stopped. When I try to turn on the mode controls nothing shows up on the LCD, no air is coming out of the vents, none of the AC, defrost buttons are working. The green background of the LCD is on but it does not show any mode controls.

All other electrical systems seem to work fine. I checked the AC/ defrost fuse in the driver panel fuse box, it is ok. I bought a new heater relay, that didn't work.

Is there a simple fix . The Lexus manual does not have any information about the relays, just the fuses.

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  • cris51 Mar 01, 2009

    Mine is a 94 sc400, the heating/ac system will not respond. All other switches and electronics are working.

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1 Answer

Ralph Eus

Ralph Eus

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  • Posted on Nov 18, 2013
Ralph Eus
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Change the 15amp fuse in the kicker fuse panel labeled cig. My stopped working for the same reason.

  • Ralph Eus
    Ralph Eus Nov 18, 2013

    Change the 15amp fuse in the kicker fuse panel labeled cig. My stopped working for the same reason.

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5 Related Answers

Anonymous

  • 52 Answers
  • Posted on Aug 08, 2008

SOURCE: cigarette lighter stopped working

Being a Lexxus the cig lighter might be a very slight different size than the plugs you are trying to use. Does the lighter work to light cigarettes (or does it glow hot after being pushed in)? If it works then it's not the fuse. If it doesn't work, try the inner fuse box-the fuse box is located to the bottom left of the steering wheel behind the little change drawer.

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Tyler

  • 60 Answers
  • Posted on Jul 23, 2008

SOURCE: CIGARETTE LIGHTER

It could be as simple as a blown fuse, could also be a bad socket or bad connections.

Anonymous

  • 1986 Answers
  • Posted on Aug 25, 2009

SOURCE: How do i change 12v power / cigarette lighter! in a Peugoet 206

The cigarette lighter is connected to a harness that's being the unit. You need to most likely remove the panel that the cigarette lighter is attached to in order to remove the lighter unit out. Once the unit is out, disconnect the wiring harness to exchange it. I don't know how exactly your lighter will come out

Anonymous

  • 1 Answer
  • Posted on Nov 29, 2011

SOURCE: air conditioner not wokring on 95 lexus sc400

Seems to me that the a/c control panel unit is not responding. You probably need to replace it ($150-200).

Anonymous

  • 786 Answers
  • Posted on Aug 22, 2012

SOURCE: all my ac and heater controls (including fan) and cig lighter stopped working on my 93 lexus sc400...fuses are good...not sure of relays...any ideas?

you can have relays checked if not sure.......

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http://whatisbyme.blogspot.in/2012/05/2000-toyota-avalon-no-heat-on-passenger.html


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http://repairhelpcenter.blogspot.com/2012/01/hot-air-on-drivers-side-vents-only.html

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http://technoanswers.blogspot.com/2012/01/temperature-gauge-does-not-move-and-no.html

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