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Headlight - brownout?
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HarryO
 


Member Since: 06 Apr 2010
Location: Brisbane Australia šŸ‡¦šŸ‡ŗ
Posts: 79

2015 Discovery 4 3.0 TDV6 Base 7 Seat Auto Fuji WhiteDiscovery 4
Headlight - brownout?

Hi All

When I start my car the Drive Light comes on bright for about 1/2 second and then dims to a crappy brown red. It stays that way no matter what I do..

Checked wiring, earthing, etc and all OK (as evidenced by bright light for 1/2 sec) - Even went as far as totally disconnecting the Bullbar - no change. I have found some threads about MOSFETs but out of my depth.

It looks like some sort of control issue and the light itself is only doing what itā€™s told. (Bit like me and the wife šŸ˜)







 Land Rovers never get bogged! - merely delayed
Land Rovers never break down! - merely fail to proceed.
Land Rovers never leak oil - itā€™s a built in anti-rust feature

Discovery 4 TDV6
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Post #224661714th Aug 2021 11:10 pm
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Kilovolt
 


Member Since: 29 Jun 2015
Location: South Derbyshire
Posts: 1017

United Kingdom 2013 Discovery 4 3.0 SDV6 Commercial XS Auto Baltic BlueDiscovery 4

I think youā€™re right about it being a control issue.

Two possibilities? The car thinks the main beam is on (the wifeā€™s VW dims the DRLs with main beam on) but also, Iā€™ve seen a lot of cars dim the DRL when the indicators are in use (flashing).

I donā€™t have a wiring diagram to hand but I wonder if thatā€™s a relay. Likely itā€™s done electronically.

I can see I havenā€™t helped here. Try Googling high beam or turn signal dimming, maybe.

Good luck Thumbs Up
 "Track day running - Don't put your foot back on the accelerator until your absolutely sure you don't have to take it off again"

Current Ride: D4 XS Commercial Baltic Blue SDV6 fully loaded with heated everything Smile
Track Days: BMW E36 M3 Evolution MY 1996 (3.2 Litre 377 BHP sat in 1,250 Kgs of car, with a pro safety cage and some serious braking power) Smile 
 
Post #224662215th Aug 2021 5:27 am
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HarryO
 


Member Since: 06 Apr 2010
Location: Brisbane Australia šŸ‡¦šŸ‡ŗ
Posts: 79

2015 Discovery 4 3.0 TDV6 Base 7 Seat Auto Fuji WhiteDiscovery 4

Thanks Kilovolt - I will look into the high beam interface - its doing my head in this one..
 Land Rovers never get bogged! - merely delayed
Land Rovers never break down! - merely fail to proceed.
Land Rovers never leak oil - itā€™s a built in anti-rust feature

Discovery 4 TDV6
Discovery 4 TDV6 (Stolen)
Discovery 3 SE (Sold)
Discovery 2 (Sold)
Defender 110 (Sold)
Series 2 (Chev 4.1 Motor & S2A Gearbox) (Sold)
Toyota Hilux bakkie (Ute) (Broke it) 
 
Post #224662315th Aug 2021 6:29 am
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M3DPO
 


Member Since: 22 Sep 2010
Location: Notts.
Posts: 8043

England 2014 Discovery 4 3.0 SDV6 HSE Lux Auto Corris GreyDiscovery 4

Try swapping the relay for a known good one, they are all named under the fuse box lid.
Half power is always a concern as is where is the other half going, possibly cause of fire Crying or Very sad
Lights should not come on at all when starting, if they are on all the time highly likely a sticking or stuck relay, they are notorious for burning compressor out.
 It can when others can't,
It will when others won't,
It goes where others don't. 
 
Post #224662415th Aug 2021 6:41 am
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