 | Home > Maintenance & Modifications > rear alarm door switch wiring |
 
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| LandRoverAnorak Member Since: 17 Jul 2011 Location: Surrey Posts: 11324  
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The door switches only have one wire - an earth. Basically, they make contact with earth when released and break when pushed in. I don't know what wiring you've got but all you should need to do is tee into the earth wire to the nearest light. Darren
110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak "You came in that thing? You're braver than I thought!" - Princess Leia |
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8th Feb 2022 9:42am |
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| Martin Site Admin Member Since: 02 Apr 2007 Location: Hook Norton Posts: 6604 
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You're looking for a single black female spade connector on a purple with blue stripe wire for the switch.
This wire will come down from the roof - perhaps it's been pulled up and tucked away? Do you have central locking (doesn't appear so)? But if you the purple/blue for the door switch should follow the orange and pink central locking wires down from the roof. The green and purple is a brake light feed, and the black is earth - neither of these will help you for the door switch!  1988 90 Td5 NAS soft top
2015 D90 XS SW |
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8th Feb 2022 10:01am |
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| GrouseII Member Since: 29 Dec 2017 Location: Bucks Posts: 37 
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Thanks gentlemen.
its all dark arts but from what you both say an earth cable (purple with black spade) from my interior light (hidden under the head lining currently dangling in fresh air, connected to the spade connector on the new switch will magically make the light come on and set the alarm off when the door opened? I've got a car mate who hopefully can explain the theory too me an other day but got to say it bewilders me that there is no power to the switch but there you go. Much appreciated Grouseii |
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8th Feb 2022 10:15am |
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| Martin Site Admin Member Since: 02 Apr 2007 Location: Hook Norton Posts: 6604
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The purple with blue stripe wire is the only wire which connects to the door switch.
When the door is opened the switch electrically connects the purple/blue to the body via the switch mounting screw. The body is at 'earth' - connected to the battery negative. This switching to earth is detected by the alarm ECU (yes you have one) which brings on the interior light/triggers the alarm. Martin 1988 90 Td5 NAS soft top
2015 D90 XS SW |
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8th Feb 2022 10:20am |
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| GrouseII Member Since: 29 Dec 2017 Location: Bucks Posts: 37
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Ah, got it.
I had the naïve idea that aluminium body was not a conductor but google tells me it is. What a numpty! Thanks again |
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8th Feb 2022 10:26am |
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| GrouseII Member Since: 29 Dec 2017 Location: Bucks Posts: 37
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Just in case it helps anyone in the future with this issue here is a link with a good wiring diagram showing what's going on (lets hope they don't delete it!)
https://forums.lr4x4.com/topic/36884-interior-light/  |
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22nd Feb 2022 9:36am |
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