↓ Advertise on Defender2 ↓

Home > Puma (Tdci) > Interior light/ alarm weirdness
Post Reply  Down to end
Page 1 of 1
Print this entire topic · 
Leaky 110



Member Since: 11 Jul 2016
Location: Glasgow
Posts: 62

Scotland 2007 Defender 110 Puma 2.4 XS CSW Zermatt Silver
Interior light/ alarm weirdness
Hi folks,

Finally trying to fix this problem! My interior lights aren’t working but are reading 12v at the bulb terminals. I’ve replaced all the door switches which hasn’t

Click image to enlarge

cured the problem. The car is now throwing the occasional alarm mislock and nanocom is telling me it’s a problem with a door other than the drivers door. I’ve had a look behind the dash and the 10as unit appears to be dry with secure connections

I’m not sure how to investigate from now on. Should I try and look for a broke. Wire between the one of the door sensors and the 10as? Not sure how much trim I need to strip out. Alternatively is it more likely that the 10as has a problem and will need checked out?

Are there any more tests I can do to rule things out?

Car is a 2007 CSW
Post #776018 3rd Jun 2019 9:09am
View user's profile Send private message View poster's gallery Reply with quote
Co1



Member Since: 19 Aug 2018
Location: North Yorkshire
Posts: 3605

United Kingdom 2013 Defender 90 Puma 2.2 HT Loire Blue
Afaik, there will be 12v on the lamps, it is the earth that is switched. When I had a similar problem it turned out to be a spider had made its home in the front interior light!
Post #776037 3rd Jun 2019 11:41am
View user's profile Send private message View poster's gallery Reply with quote
Leaky 110



Member Since: 11 Jul 2016
Location: Glasgow
Posts: 62

Scotland 2007 Defender 110 Puma 2.4 XS CSW Zermatt Silver
Ok.... I’m a bit of a novice with wiring but I’m willing to try!
So would a switched earth lead back to the likelihood that it’s the wiring to one of the door switches that’s broken somewhere? Broken wire=open circuit= impossible to earth?

Thanks for the help so far 🙂
Post #776088 3rd Jun 2019 7:13pm
View user's profile Send private message View poster's gallery Reply with quote
Fifth Horseman



Member Since: 08 Mar 2011
Location: Lanarkshire
Posts: 322

United Kingdom 2011 Defender 110 Puma 2.4 XS CSW Santorini Black
The Defender door switches have a single where to them and the switch provides an earth with the door open. It is possible that the wire to one of the switches has broken and is earthing to the bodywork. To check this remove the switching check the condition of the wire connected to it. No trim removal should be required, the switch is held in place by a single screw.

It may still be a fault with the 10AS unit but worth checking the cheap things first.
Post #776099 3rd Jun 2019 7:50pm
View user's profile Send private message View poster's gallery Reply with quote
Leaky 110



Member Since: 11 Jul 2016
Location: Glasgow
Posts: 62

Scotland 2007 Defender 110 Puma 2.4 XS CSW Zermatt Silver
I changed all of the door switches and had a look at as much wire as I could see when I had them out.

If that’s a negative (pardon the pun) I guess I’m removing the 10as for further investigation 😤
Post #776101 3rd Jun 2019 8:03pm
View user's profile Send private message View poster's gallery Reply with quote
Fifth Horseman



Member Since: 08 Mar 2011
Location: Lanarkshire
Posts: 322

United Kingdom 2011 Defender 110 Puma 2.4 XS CSW Santorini Black
If the interior lights never come on, then it seems likely that the 10AS unit is at fault, otherwise it may just be that the "lamp on" function is timing-out due to the alarm unit thinking a door has been open too long. There may be a chafed wire in the wire to either of the two side doors or the front passenger door. I'm unsure of the exact routing of the cables to the switches (and am unable to check as I no longer have a Defender), I think the rear side door switch cables go down the 'B' pillars into the seat box and the rear door switch cable is in the main loom to the rear.

Although the alarm unit seems dry, it may have suffered damp in its past. Unplug the connectors to see if any of the pins are corroded.
Post #776121 3rd Jun 2019 9:46pm
View user's profile Send private message View poster's gallery Reply with quote
custom90



Member Since: 21 Jan 2010
Location: South West, England.
Posts: 19451

United Kingdom 
Check the A pillar trim screws haven’t penetrated any wiring while you are at it. It’s easily done, or if not the screw crushed as there is little room.

Mine are playing up too, but it’s door switches on mine. Diesels Lives Matter. ⛽️🛢️👨‍🔧🧰⚙️
And if You Love the Country, then we’re on the same side ~
I got’ love for Britain, I got’ British pride’. 🇬🇧
Post #776128 3rd Jun 2019 10:57pm
View user's profile Send private message View poster's gallery Reply with quote
Leaky 110



Member Since: 11 Jul 2016
Location: Glasgow
Posts: 62

Scotland 2007 Defender 110 Puma 2.4 XS CSW Zermatt Silver
That’s brilliant advice folks, thank you.

I think there’s nothing else for it but to start tracing wires and looking for breaks or chafing.

This car is trying my patience but I shudder to think how many hours labour I might need to pay someone to find the fault!
Post #776139 4th Jun 2019 9:02am
View user's profile Send private message View poster's gallery Post Reply
Post Reply  Back to top
Page 1 of 1
All times are GMT

Jump to  
Previous Topic | Next Topic >
Posting Rules
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum



Site Copyright © 2006-2024 Futuranet Ltd & Martin Lewis
DEFENDER2.NET RSS Feed - All Forums