| Home · FAQ · New Posts · My Posts · PMs · Search · Members · Members Map · Groups · Profile · Donate ·
Log In
|
- You are currently viewing DISCO4.COM as a guest - Register to take part or Log In
GEB4x4
Member Since: 26 Aug 2014
Location: Cornwall
Posts: 21
 
|
| D4 Dipped headlight bulb gone |
|
Noticed last night when the wife came home that there was a dipped headlight bulb out. I asked if she had seen a warning message come up but she said no. I thought that's strange, I've had a lot older cars that have showed messages, but sure enough I got in and started up and no message, is this right? Surely it should warning or light check?
|
 12th Dec 2014 9:20 pm |
|
|
Dave T
Member Since: 03 Jul 2009
Location: Glasgow
Posts: 6910
|
Don't have a light warning on the D4, good time to get some Osama night breakers from advanced factors though.  Joined the BMWX5 45e group
1994 Defender 90
2015 RRS Corris Grey/Black roof
2016 D4 Graphite Santorini Black
2012 D4 XS Orkney Grey
2005 D3 S Maya Gold
Convoy for Heroes 2011
|
| 12th Dec 2014 10:41 pm |
|
|
J77
Member Since: 03 Mar 2008
Location: Fife
Posts: 6270
|
Osram nightbreakers in mine, a big difference over the standard bulb 23.5MY Defender 90 X-Dynamic SE D250 MHEV Pangea Green
|
| 12th Dec 2014 11:25 pm |
|
|
Matts3
Member Since: 02 Jan 2015
Location: North Norfolk
Posts: 162
|
Do you upgrade the bulbs in the dipped beam or both? (it looks like there is a bulb for both dipped and main beam when looking into the headlight that's all?)
|
| 22nd Jan 2015 4:04 pm |
|
|
discoteca
Member Since: 08 Mar 2010
Location: Warwickshire
Posts: 1477
|
Its always amazed me that the D4 doesn't alert the driver when a headlight bulb is out. I think they simply forgot to add the message when they designed it.
To be clear your D4 does know when a headlight bulb is out, it has a very sophisticated bulb monitoring system for the headlights, (the lights don't even have to be turned on for it to know that a bulb is broken). Unfortunately all it does when it realises that a bulb is out is log a fault code that you can then only read with a fault code reader.
I really do think that a programmer somewhere simply forgot to put in the logic that says if fault code X is present display bulb failed on the instrument cluster 
|
| 22nd Jan 2015 4:26 pm |
|
|
|
|
DG
Site Moderator
Member Since: 12 Dec 2005
Location: The Gaff
Posts: 50977
|
I use the miracle of "vision" to tell me if there are any lights out   21 year LR veteran > D2 GS 2003 > D3 S 2006 > D3 HSE 2009 > D4 HSE 2013 > D4 HSE 2015 > D5 HSE 2018 > DS HSE R-Dynamic P300e 2021
|
| 22nd Jan 2015 4:32 pm |
|
|
discoteca
Member Since: 08 Mar 2010
Location: Warwickshire
Posts: 1477
|
And if you really want to know the details of how it monitors the headlight bulbs here it is from the documentation:
Bulb Monitoring
Bulb failure monitoring is performed by the CJB processor. The lamps are cold and warm monitored by the MOSFETs in order to detect bulb failure.
• NOTE: Relay controlled lamps have no diagnostic monitoring.
The CJB processor provides outputs to each MOSFET. The output switches the MOSFET to supply the required output to power the applicable lighting circuit. The microprocessor evaluates the circuits by detecting the returned signals from the controlling MOSFET.
When the bulb or LED is functioning normally, the output signal voltage from the controlling MOSFET is 0V. If a bulb or LED in the circuit fails, an open circuit occurs and the MOSFET outputs a signal of 5V to the processor. The signal is interpreted as a bulb or LED failure and generates a Diagnostic Trouble Code (DTC) which can be retrieved using an approved Land Rover diagnostic system.
Warm monitoring is performed continuously when the lights are switched on by evaluating the diagnostic output of the MOSFET switches. Cold monitoring is performed at 32 second intervals when the lights are switched off. The MOSFETs briefly switch on the lights for approximately 1 millisecond (this is insufficient to illuminate the bulb or LED) and checks the bulb or LED as per warm monitoring.
Cold monitoring is not possible for the low/high beam headlamps of vehicles using xenon bulbs. On these vehicles the cold monitoring of the low/high beam headlamps is switched off in the CJB. The CJB detects a failed xenon bulb via a reduction in current flow to the affected headlamp's xenon control module.
When a xenon bulb fails, the control module's current consumption falls to 60mA, which the CJB detects as unsuccessful bulb illumination.
|
| 22nd Jan 2015 4:34 pm |
|
|
promitheus
Member Since: 04 Jul 2009
Location: Afidnes, Greece
Posts: 572
|
Don't you love electronics 
|
| 22nd Jan 2015 6:57 pm |
|
|
euangibson
Member Since: 24 Dec 2010
Location: Borders
Posts: 11027
|
Dave T wrote:...... good time to get some Osama night breakers from advanced factors though.
Ahh,the old Osama night breakers....you've seen Zero Dark Thirty as well then Dave ?  "Better to remain silent and be thought a fool,than to speak out and remove all doubt" ?.....what rubbish...
Locking rear E-diff
RLD spare wheel protector & sump guard
Extended roof rails
Series 111 mudflaps
Black side tubes,grill and vents
Timed climate remote
Hids4u interior lights
D4 Firenze my2012 HSE
D3 Java 2005 SE manual (sold,sadly,thanks for the memories)
1966 '88 Series 2a....still starts in the morning better than I do...
|
| 22nd Jan 2015 7:02 pm |
|
|
Sthomas7477
Member Since: 18 Oct 2013
Location: Didcot
Posts: 29
|
I've had 4 Dipped Beam bulbs blow in less than a year on my D4 - I tried the NightBreakers - which were nice and bright while they lasted (less than 3 months).
Thought it would be a bit expensive to keep buying pairs of 'upgrade' bulbs - so went to Halfords thinking I'd stock up on 'cheap' ones, to keep in the car - and found these 'long life' versions - so far so good, but time will tell. Seem reasonably bright too.
GE 477 H7 Long Life Headlamp Bulb x 2
Got the replacement process down to a fine art now though ... I even managed to change one recently in the car park at the Drive Thru Costa, before my flat white got cold ... D3 S 2006 - 2013
D4 XS 2013 - present
|
| 22nd Jan 2015 7:47 pm |
|
|
DRRP
Member Since: 04 Oct 2012
Location: Glasgow
Posts: 28
|
I have the same problem on mine - multiple bulb failure over an unusually short period of time. Never got to the bottom of it and like you got fed up of paying for expensive high power bulbs.
How long have these long life ones been in ?
Anyone got any idea what the actual problem is? (Someone on here previously suggested that car might be configured for exons - but I got the dealer to check and mine was supposedly set up correctly)
Thanks,
Dean 2012 Discovery 4 SDV6 GS
2006 FFRR TDV8 Vogue
|
| 22nd Jan 2015 10:38 pm |
|
|
|
|
|
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
|
|
|
DISCO4.COM Copyright © 2004-2024 Futuranet Ltd & Martin Lewis
|
|
DISCO4.COM is independent and not affiliated to Land Rover.
