 | Home > Td5 > TD5 Headlights turning on when sidelights are on |
 
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| Dinnu Member Since: 24 Dec 2019 Location: Lija Posts: 3210   
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Possibly the dim dip relay is faulty if it has one. 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing
2012 90 CSW, 2.2TDCI, Santorini Black |
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20th Dec 2021 2:31pm |
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| FD7 Member Since: 16 Feb 2021 Location: Midland Posts: 169 
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It's a 2004 TD5, where is this relay whilst I have you?
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20th Dec 2021 2:36pm |
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| rallysteve Member Since: 10 Feb 2014 Location: Cumbria Posts: 2200  
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sounds like the dim-dip system working as it should. To disable it (so sidelight position on switch is only sidelights) it is easiest to unplug the resistor which is fitted to the driver's side inner wing. If you reach down near the air intake under the bonnet you can just unplug it.
Steve 02' 110 TD5 Double Cab Rebuild Thread 84' 90 3.9 V8 Caged Pickup Build Thread - Now For Sale |
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20th Dec 2021 2:41pm |
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| Dinnu Member Since: 24 Dec 2019 Location: Lija Posts: 3210
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I am not sure if I cannot help you with the location on a Td5...but according to this site: https://www.landroverexpedition.com/techni...dip-relay/
The relay on Td5 and earlier vehicles is located on the bulkhead below the instruments. If you have front speakers then you can easily get to it behind the driver's speaker. Otherwise you will have to remove the instrument binnacle and reach down. On Puma/Tdci vehicles the relay is located on the fuse board on the dash. The site above also gives you the part number. On my 1988 it was behind the binnacle (dim dip unit different than the later pinkish relay). 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing 2012 90 CSW, 2.2TDCI, Santorini Black |
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20th Dec 2021 2:42pm |
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| mark1200 Member Since: 09 Oct 2011 Location: peterborough Posts: 64  
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When my sidelights are switched on my headlights come on but only at half power i thought this was normal and have never thought of as a problem. Or am i wrong ?
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20th Dec 2021 4:37pm |
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| LandRoverAnorak Member Since: 17 Jul 2011 Location: Surrey Posts: 11240 
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No, you're not wrong. It's the aforementioned dim dip system, which is a hangover from a long abandoned lighting regulation. Disabling it by unplugging the resistor as described above is good for the longevity of your headlight bulbs. 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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20th Dec 2021 5:47pm |
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| jim4244 Member Since: 13 Apr 2014 Location: Bedfordshire Posts: 641 
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Where is the resistor located on a 1997 300Tdi please?
Jim |
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20th Dec 2021 6:49pm |
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| rallysteve Member Since: 10 Feb 2014 Location: Cumbria Posts: 2200
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Same place as described above
Steve 02' 110 TD5 Double Cab Rebuild Thread 84' 90 3.9 V8 Caged Pickup Build Thread - Now For Sale |
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20th Dec 2021 6:56pm |
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| dorsetsmith Member Since: 30 Oct 2011 Location: South West Posts: 4554 |
 Click image to enlarge |
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20th Dec 2021 7:59pm |
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| LANDROVER Member Since: 13 Feb 2016 Location: EAST OF ENGLAND Posts: 205
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I only just noticed this and my brother was convinced it was not like this and now it is! So just to confirm..... pushing the light switch forward one click brings sidelights and slightly illuminated headlight's. Second click is sidelights and dipped headlights. So basically the headlights are always illuminated regardless of position just varying brightness. This will save me looking for a problem that isn't there 
Thank you! |
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26th Dec 2021 12:36am |
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| LandRoverAnorak Member Since: 17 Jul 2011 Location: Surrey Posts: 11240
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Yes, that's right. 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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26th Dec 2021 12:53am |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 16884 
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True provided that the engine is running or the "ignition" is on. If the ignition is off, the the sidelight position just turns the sidelights on, not the dim dip. Be advised that the use of dim dip will significantly shorten the life of incandescent headlamp bulbs and that the factory wiring is incompatible with loom upgrades to prevent the inevitable switch failure which all standard defenders inevitably suffer from in the end, and is also incompatible with LED headlamp upgrades. Fortunately dim dip can be disabled and "normal" headlamp function instigated simply by unplugging the connector from the dim dip resistor under the offside wing (adjacent to the factory radio aerial). Some people replace the dim dip relay with a jumper to eliminate the relay as a possible source of failure, but the relay is actually generally quite reliable. The most charitable comment you can make about the dim dip idea is that overall it has absolutely no redeeming virtue and was a stupid idea dreamt up by cretins! Apart from the technical shortcomings it didn't even achieve anything useful, and one of the few occasions when EU legislation has done the UK motorist any favours was when the EU ruled that it was illegal for the UK to make dim dip a national legal requirement. |
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26th Dec 2021 10:10am |
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| Dinnu Member Since: 24 Dec 2019 Location: Lija Posts: 3210
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I guess on newer models there is better electric logic... but I can state that on my MY88, the dim dip (headlights on low power) only come on if there is sufficient oil pressure
Thats because it closes the circuit by grounding through the oil pressure switch.
I have reinstated mine only because I think it looks cooler with the headlights dimmed. 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing 2012 90 CSW, 2.2TDCI, Santorini Black |
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26th Dec 2021 10:31am |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 16884
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Is it the oil pressure, or is it the "engine running" signal from the ECM (which is I think really an "alternator output present" signal - at least it is on the 2.4)? Not that it makes much difference really....
"Engine running" is used for things like the heated front windscreen so that the screen heater can't be turned on if just the "ignition" is on. |
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26th Dec 2021 10:37am |
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