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Head light fault
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PTurner
 


Member Since: 25 Jul 2020
Location: Worcestershire
Posts: 2

United Kingdom 2006 Discovery 3 TDV6 HSE Auto Unknown ColourDiscovery 3
Head light fault

Hi, I am new to this so please excuse if this topic has been covered numerous times already!

My 2006 D3 HSE seems to have developed a fault. Today driving on the motorway turning on the headlights has kicked off the cruise control and the automatic gearbox stopped working. The other day on a country road it also lowered the suspension as well as stopped the gearbox working.

Does anyone have any suggestions as to the fault and how to fix it please?
  
Post #216335125th Jul 2020 5:03 pm
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kajtzu
 


Member Since: 11 Aug 2017
Location: Helsinki
Posts: 6562

Finland 2005 Discovery 3 4.4 V8 HSE Auto Cairns BlueDiscovery 3

Start by having the codes read. Preferably with a Land Rover specific diagnostic tool like IID (I know there are many others but I’m mostly familiar with this one and JLR SDD).
  
Post #216335325th Jul 2020 5:10 pm
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 10359

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

Need to pull the carpet up on the front passenger side.

See if it’s wet. And dry out

Look at the wiring along the side.

The joins or splices in tape may need redoing.
  
Post #216336225th Jul 2020 6:12 pm
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Bungle
 


Member Since: 07 Apr 2015
Location: Wanborough
Posts: 254

United Kingdom 2005 Discovery 3 4.4 V8 HSE Auto Cairns BlueDiscovery 3

Worth checking the brake lights and side lights at the rear of the car. There can be an issue if one of the elements blow and fall across the other within the stop/tail bulb, it can produce a transmission fault even though there is nothing actually wrong with the transmission, a quick simple fix if it is this and worth a look before delving any deeper.
  
Post #216373127th Jul 2020 11:13 am
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PTurner
 


Member Since: 25 Jul 2020
Location: Worcestershire
Posts: 2

United Kingdom 2006 Discovery 3 TDV6 HSE Auto Unknown ColourDiscovery 3

Thanks Bungle, I had done a bit of googling and found something similar had happened to someone on another forum. I checked this morning and found one of the stop/tail lights was broken. If I put the lights on it worked fine but if I then pressed the brake the light actually got darker rather than brighter. I've now changed the bulb and having looked at the filament in it you are exactly right, where the filament had melted parted of it had fused to the other filament.
Can't believe something so simple could cause such major error messages and faults!
  
Post #216381627th Jul 2020 3:15 pm
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Bungle
 


Member Since: 07 Apr 2015
Location: Wanborough
Posts: 254

United Kingdom 2005 Discovery 3 4.4 V8 HSE Auto Cairns BlueDiscovery 3

In the very early days of the D3 it led to some dealers changing gearboxes under guarantee, of course as part of their "giving it a once over" they spotted the brake light failure on the way out of the workshop so would change that as well, not sure how many were changed before someone realised.......
  
Post #216381727th Jul 2020 3:19 pm
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kajtzu
 


Member Since: 11 Aug 2017
Location: Helsinki
Posts: 6562

Finland 2005 Discovery 3 4.4 V8 HSE Auto Cairns BlueDiscovery 3

Yeah, I had once the BLS fail on me while driving and it almost gave me a heart attack. Pretty much every warning light went on and the LCD display scrolled through a multitude of error messages starting with transmission fault. Read codes, swap the BLS (I checked rear lights first) and everything was normal again. Now my rear lights are D4 LEDs, I think one problem less. Whistle
  
Post #216382327th Jul 2020 3:48 pm
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