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Thread: Air Conditioning Lead Wires on 1990 XJS V12

  1. #1
    Member SouthernGypsy's Avatar
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    Air Conditioning Lead Wires on 1990 XJS V12

    We seem to have all of the little bugs worked out of our new 1990 XJS V-12 except for one. The plug that connects to the AC compressor has two wires, one just loops back and connects to ground at the back of the AC compressor, the other one on our car leads off for maybe 6 inches or so and then just ends. It's broken or pulled loose from somewhere but we can't figure out where. Diagrams make it look like it might go to a AC system pressure switch of some sort but we can't find that either.

    Anyone know where this wire is routed from?
    ~ SouthernGypsy

    1996 Jaguar XJS 2+2 Convertible 4.0L - Sapphire Blue
    1995 Jaguar XJS 2+2 Convertible V12 - Flamenco Red

  2. #2
    Member spud's Avatar
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    What compressor, if its the G.M. One and the wire is green it probably goes to the thermal fuse which is bolted to the front of the compressor

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    Member SouthernGypsy's Avatar
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    Quote Originally Posted by spud View Post
    What compressor, if its the G.M. One and the wire is green it probably goes to the thermal fuse which is bolted to the front of the compressor

    We have a green wire with brown stripe that if we apply 12v the compressor kicks on, but it's broken off.

    Where does the wire come to the other side of the thermal fuse from?

    Ie. Where is the source of power come from before it gets to the compressor?
    Last edited by SouthernGypsy; 13-10-17 at 17:13.
    ~ SouthernGypsy

    1996 Jaguar XJS 2+2 Convertible 4.0L - Sapphire Blue
    1995 Jaguar XJS 2+2 Convertible V12 - Flamenco Red

  4. #4
    Senior Member rchiv's Avatar
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    That wire goes to the Compressor relay next to the starter relay.

    Roger
    HEY I THOUGHT I HAD RETIRED, Ex Auto Electrician
    2006 X Type 2.2d SE Manual Estate. Zurcon Blue Champagne/Mocca, F/R Parking sensors, ,Auto Lights, Auto Wipers, Headlight Washers, Sat Nav 2012 update, 17 in Wheels, 107K Mods:- Electric Autofold Mirrors on Locking , HID Dip Beams
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  5. #5
    Member SouthernGypsy's Avatar
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    Quote Originally Posted by rchiv View Post
    That wire goes to the Compressor relay next to the starter relay.

    Roger

    Straight to it? The wiring diagrams indicate that it goes through some kind of a pressure switch along the way.
    ~ SouthernGypsy

    1996 Jaguar XJS 2+2 Convertible 4.0L - Sapphire Blue
    1995 Jaguar XJS 2+2 Convertible V12 - Flamenco Red

  6. #6
    Senior Member rchiv's Avatar
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    The wire goes from the pressure switch to the relay. If when you make the lead live the compressor kicks in then the sensor must be ok and its the relay that is not connected.
    The pressure switch in the diagrams picture shows it to be at the rear of the compressor.

    Roger
    HEY I THOUGHT I HAD RETIRED, Ex Auto Electrician
    2006 X Type 2.2d SE Manual Estate. Zurcon Blue Champagne/Mocca, F/R Parking sensors, ,Auto Lights, Auto Wipers, Headlight Washers, Sat Nav 2012 update, 17 in Wheels, 107K Mods:- Electric Autofold Mirrors on Locking , HID Dip Beams
    Simple Autofold Mirrors on Locking,http://www.jaguarforum.com/showthrea...irrors+locking
    UPDATE YOUR SIGNATURE http://www.jaguarforum.com/showthread.php?t=91945

  7. #7
    Member SouthernGypsy's Avatar
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    Quote Originally Posted by rchiv View Post
    The wire goes from the pressure switch to the relay. If when you make the lead live the compressor kicks in then the sensor must be ok and its the relay that is not connected.
    The pressure switch in the diagrams picture shows it to be at the rear of the compressor.

    Roger

    How does making the compressor kick in by running a wire straight from a battery jumper to the wire on the compressor show that the sensor is ok? IF the wire on the compressor should go through the sensor. I'm not saying the compressor kicks in when we touch that wire together, the wire is broken and doesn't go anywhere right now. I was saying we tested the compressor by running 12v direct to it. Just wanted to make sure you understood what I was saying.

    And we have not found the pressure switch yet, but it doesn't seem to be at the rear of the compressor.
    ~ SouthernGypsy

    1996 Jaguar XJS 2+2 Convertible 4.0L - Sapphire Blue
    1995 Jaguar XJS 2+2 Convertible V12 - Flamenco Red

  8. #8
    Senior Member rchiv's Avatar
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    Sorry but in your third post you said that you supplied a live to that wire and the compressor kicked in.
    From the diagrams I think you will find that the Pressure switch IS the Compressor Clutch connector so it gets its feed from the clutch relay. Have you found the relay and connected a lead from pin 30 to that short wire to see what happens.

    Roger
    HEY I THOUGHT I HAD RETIRED, Ex Auto Electrician
    2006 X Type 2.2d SE Manual Estate. Zurcon Blue Champagne/Mocca, F/R Parking sensors, ,Auto Lights, Auto Wipers, Headlight Washers, Sat Nav 2012 update, 17 in Wheels, 107K Mods:- Electric Autofold Mirrors on Locking , HID Dip Beams
    Simple Autofold Mirrors on Locking,http://www.jaguarforum.com/showthrea...irrors+locking
    UPDATE YOUR SIGNATURE http://www.jaguarforum.com/showthread.php?t=91945

  9. #9
    Member SouthernGypsy's Avatar
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    Quote Originally Posted by rchiv View Post
    Sorry but in your third post you said that you supplied a live to that wire and the compressor kicked in.
    From the diagrams I think you will find that the Pressure switch IS the Compressor Clutch connector so it gets its feed from the clutch relay. Have you found the relay and connected a lead from pin 30 to that short wire to see what happens.

    Roger
    Yes, live as in 12v direct to it.

    It may be in the compressor, never seen one like that but it could be. The FSM wiring diagrams just shows that there is a pressure sensor in line but doesn't indicate how far/short away it is nor where it's mounted, only that it's in the circuit.
    ~ SouthernGypsy

    1996 Jaguar XJS 2+2 Convertible 4.0L - Sapphire Blue
    1995 Jaguar XJS 2+2 Convertible V12 - Flamenco Red

  10. #10
    Senior Member rchiv's Avatar
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    I am looking at the wiring diagram from http://www.jagrepair.com/JaguarXJSEl...OBDIIcodes.htm and on Fig 26.1 and 27.1 you will see the Pressure switch and to the right you will see it says COMP CLUTCH. The drawings on the page between the two show the switch So my way of thinking is that the pressure switch is the wires from the compressor that you are talking about. The wire colour is shown as Green/White so in your case the Green/brown could just be a faded colour.
    As I said, have you found the relay and linked a wire to the short wire from the compressor to see if it then operates.

    Roger
    Last edited by rchiv; 15-10-17 at 00:17. Reason: he
    HEY I THOUGHT I HAD RETIRED, Ex Auto Electrician
    2006 X Type 2.2d SE Manual Estate. Zurcon Blue Champagne/Mocca, F/R Parking sensors, ,Auto Lights, Auto Wipers, Headlight Washers, Sat Nav 2012 update, 17 in Wheels, 107K Mods:- Electric Autofold Mirrors on Locking , HID Dip Beams
    Simple Autofold Mirrors on Locking,http://www.jaguarforum.com/showthrea...irrors+locking
    UPDATE YOUR SIGNATURE http://www.jaguarforum.com/showthread.php?t=91945

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