Strange engine noise
#21
10-08-2016, 11:06 PM
That's what I thought except some say although the lights themselves are cooler...and LEDs are...the power system (transformers?) gets hot. I don't know. I'm surprised you can't hear anything because it's very obvious even with my poor hearing. Not saying it's a problem, just curious. Next time you turn off the car and exit put your ear near either headlight assembly or the front grill for stereo. It will even start if you just touch the door handle with or without the key in your pocket. Yes, great lighting.
#22
10-09-2016, 04:02 PM
The "noise" is real! Took my XF into Tampa Jag and they gave me another XF while they tried to figure out what's happening. Some mechanics heard it, some did not (shop noise I suspect was a factor). Those who heard it could not explain it. They send an inquiry to JAGUSA and JAGUK but there were no other reports. The fun part, tho, was the XF loaner also had the "noise." Oh well, at least it is documented with them in case of future issues. Suggest others who can hear it also document it with their dealership.
#23
10-12-2016, 03:36 PM
#24
10-12-2016, 04:21 PM
#25
10-12-2016, 08:39 PM
Yes, things happen when the door handle is grabbed. Yes, the LED headlamps have cooling fans that are fired up before the car is started.
*****************************
Temperature Management
In contrast to Halogen or Xenon headlamp systems, LEDs emit 'cold' light, meaning that
no infrared radiation is being produced. Due to their high efficiency 20% of the input
energy is transformed into visible light (for comparison a filament bulb only transforms
5%). The rest of the energy generates heat within the semiconductor chip.
Luminous flux, colour and forward voltage are dependant on the temperature. If the
allowed temperature is exceeded, the lifetime of the LED will be adversely affected, or in
a worst case scenario, will be destroyed. To protect the semiconductor chip, which is the
hottest component in the headlamp, cooling elements with a controlled air transportation
system have been developed. A small fan, controlled by the headlamp control module, is
built into the headlamp assembly to address this issue.
The systematic direction of the warm air to the bezel of the headlamp, is simultaneously
used for de-icing and de-condensation.
***********************
What happens, and when varies between models and equipment levels. Grabbing the door handle starts the LED fans, opening the door energizes the fuel pump relay to power up the Fuel Pump Driver Module. There are other examples, but you get the idea.
Cheers,
*****************************
Temperature Management
In contrast to Halogen or Xenon headlamp systems, LEDs emit 'cold' light, meaning that
no infrared radiation is being produced. Due to their high efficiency 20% of the input
energy is transformed into visible light (for comparison a filament bulb only transforms
5%). The rest of the energy generates heat within the semiconductor chip.
Luminous flux, colour and forward voltage are dependant on the temperature. If the
allowed temperature is exceeded, the lifetime of the LED will be adversely affected, or in
a worst case scenario, will be destroyed. To protect the semiconductor chip, which is the
hottest component in the headlamp, cooling elements with a controlled air transportation
system have been developed. A small fan, controlled by the headlamp control module, is
built into the headlamp assembly to address this issue.
The systematic direction of the warm air to the bezel of the headlamp, is simultaneously
used for de-icing and de-condensation.
***********************
What happens, and when varies between models and equipment levels. Grabbing the door handle starts the LED fans, opening the door energizes the fuel pump relay to power up the Fuel Pump Driver Module. There are other examples, but you get the idea.
Cheers,
The following 2 users liked this post by xjrguy:
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#26
10-12-2016, 09:30 PM
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Yes, things happen when the door handle is grabbed. Yes, the LED headlamps have cooling fans that are fired up before the car is started.
*****************************
Temperature Management
In contrast to Halogen or Xenon headlamp systems, LEDs emit 'cold' light, meaning that
no infrared radiation is being produced. Due to their high efficiency 20% of the input
energy is transformed into visible light (for comparison a filament bulb only transforms
5%). The rest of the energy generates heat within the semiconductor chip.
Luminous flux, colour and forward voltage are dependant on the temperature. If the
allowed temperature is exceeded, the lifetime of the LED will be adversely affected, or in
a worst case scenario, will be destroyed. To protect the semiconductor chip, which is the
hottest component in the headlamp, cooling elements with a controlled air transportation
system have been developed. A small fan, controlled by the headlamp control module, is
built into the headlamp assembly to address this issue.
The systematic direction of the warm air to the bezel of the headlamp, is simultaneously
used for de-icing and de-condensation.
***********************
What happens, and when varies between models and equipment levels. Grabbing the door handle starts the LED fans, opening the door energizes the fuel pump relay to power up the Fuel Pump Driver Module. There are other examples, but you get the idea.
Cheers,
*****************************
Temperature Management
In contrast to Halogen or Xenon headlamp systems, LEDs emit 'cold' light, meaning that
no infrared radiation is being produced. Due to their high efficiency 20% of the input
energy is transformed into visible light (for comparison a filament bulb only transforms
5%). The rest of the energy generates heat within the semiconductor chip.
Luminous flux, colour and forward voltage are dependant on the temperature. If the
allowed temperature is exceeded, the lifetime of the LED will be adversely affected, or in
a worst case scenario, will be destroyed. To protect the semiconductor chip, which is the
hottest component in the headlamp, cooling elements with a controlled air transportation
system have been developed. A small fan, controlled by the headlamp control module, is
built into the headlamp assembly to address this issue.
The systematic direction of the warm air to the bezel of the headlamp, is simultaneously
used for de-icing and de-condensation.
***********************
What happens, and when varies between models and equipment levels. Grabbing the door handle starts the LED fans, opening the door energizes the fuel pump relay to power up the Fuel Pump Driver Module. There are other examples, but you get the idea.
Cheers,
But THIS was a surprise. Read on.
RECALL. K434 MIL LAMP ILLUMINATED PO25C-11 DTC.
Recall issued. Performed recall. Updated PCM software
So we weren't aware of any "recall"? Only found it out due to bringing car in. (Yes. Car still wakes up) Thank u all for input. It's greatly appreciated and YES it did help. Cheers!
#27
10-17-2016, 04:18 PM
Yes, things happen when the door handle is grabbed. Yes, the LED headlamps have cooling fans that are fired up before the car is started.
*****************************
Temperature Management
In contrast to Halogen or Xenon headlamp systems, LEDs emit 'cold' light, meaning that
no infrared radiation is being produced. Due to their high efficiency 20% of the input
energy is transformed into visible light (for comparison a filament bulb only transforms
5%). The rest of the energy generates heat within the semiconductor chip.
Luminous flux, colour and forward voltage are dependant on the temperature. If the
allowed temperature is exceeded, the lifetime of the LED will be adversely affected, or in
a worst case scenario, will be destroyed. To protect the semiconductor chip, which is the
hottest component in the headlamp, cooling elements with a controlled air transportation
system have been developed. A small fan, controlled by the headlamp control module, is
built into the headlamp assembly to address this issue.
The systematic direction of the warm air to the bezel of the headlamp, is simultaneously
used for de-icing and de-condensation.
***********************
What happens, and when varies between models and equipment levels. Grabbing the door handle starts the LED fans, opening the door energizes the fuel pump relay to power up the Fuel Pump Driver Module. There are other examples, but you get the idea.
And I can quote from Jaguar publicity:"
Cheers,
*****************************
Temperature Management
In contrast to Halogen or Xenon headlamp systems, LEDs emit 'cold' light, meaning that
no infrared radiation is being produced. Due to their high efficiency 20% of the input
energy is transformed into visible light (for comparison a filament bulb only transforms
5%). The rest of the energy generates heat within the semiconductor chip.
Luminous flux, colour and forward voltage are dependant on the temperature. If the
allowed temperature is exceeded, the lifetime of the LED will be adversely affected, or in
a worst case scenario, will be destroyed. To protect the semiconductor chip, which is the
hottest component in the headlamp, cooling elements with a controlled air transportation
system have been developed. A small fan, controlled by the headlamp control module, is
built into the headlamp assembly to address this issue.
The systematic direction of the warm air to the bezel of the headlamp, is simultaneously
used for de-icing and de-condensation.
***********************
What happens, and when varies between models and equipment levels. Grabbing the door handle starts the LED fans, opening the door energizes the fuel pump relay to power up the Fuel Pump Driver Module. There are other examples, but you get the idea.
And I can quote from Jaguar publicity:"
ewsroom.jaguarlandrover.com/en-gb/jaguar/news/2015/.../jag_all_new_xf_010415/
The Jaguar XF is true to the great tradition of sporting Jaguar saloons while ... So efficient are they that, unlike first-generation designs, cooling fans are not needed. ... The all-new XF range will consist of: XF Prestige, XF R-Sport, XF Portfolio, XF S. .... At the rear, the LED tail lights feature the signatureJaguar graphic
Cheers,
It may be you are referring to your XJR and NOT the XF which I repeat, according to my dealer does NOT have LED lights cooling fans on the 2016 model I have. I will recheck with the dealer when I return from my current trip.
And I can quote from Jaguar publicity:"
ewsroom.jaguarlandrover.com/en-gb/jaguar/news/2015/.../jag_all_new_xf_010415/
The Jaguar XF is true to the great tradition of sporting Jaguar saloons while ... So efficient are they that, unlike first-generation designs, cooling fans are not needed. ... The all-new XF range will consist of: XF Prestige, XF R-Sport, XF Portfolio, XF S. .... At the rear, the LED tail lights feature the signatureJaguar graphic
Cheers,[/QUOTE]
AL
Last edited by BCJAG; 10-17-2016 at 04:34 PM.
#28
10-17-2016, 04:43 PM
Senior Member
This is more than anyone wants or needs to know but it explains some of the issues with cooling LED's. I still believe the LED's in the XF are fan cooled or some leprechaun is inside each assembly enjoying a breeze from his personal miniature fan...
Frankly, dealers don't have all the facts about the XF. Ask them how they remove the oil from your engine at oil changes...through the pan or sucking it out with a tube from under the hood. I was amazed that the dealer did not know how it works on the Land Rovers so would imagine they are daft on lots of other issues with a new model vehicle.
http://www.cree.com/~/media/Files/Cr...Management.pdf
Frankly, dealers don't have all the facts about the XF. Ask them how they remove the oil from your engine at oil changes...through the pan or sucking it out with a tube from under the hood. I was amazed that the dealer did not know how it works on the Land Rovers so would imagine they are daft on lots of other issues with a new model vehicle.
http://www.cree.com/~/media/Files/Cr...Management.pdf
Last edited by Magnumforc; 10-17-2016 at 04:46 PM.
#29
05-14-2021, 01:44 PM
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#30
05-14-2021, 02:22 PM
It's surprising to me that LED headlights get so hot. Aren't LEDs supposed to be super-efficient and turn nearly all of the electrical input energy into light and not heat - in contrast to the old incandescent and halogen bulbs? If LEDs get so hot a significant amount of input energy must be wasted as heat.
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#31
05-23-2021, 05:52 AM
It's surprising to me that LED headlights get so hot. Aren't LEDs supposed to be super-efficient and turn nearly all of the electrical input energy into light and not heat - in contrast to the old incandescent and halogen bulbs? If LEDs get so hot a significant amount of input energy must be wasted as heat.
#32
05-23-2021, 12:40 PM
Yes, I noted that response only after I had posted mine! So it does seem that, though LEDs are indeed more efficient than incandescent and halogen bulbs, they are not THAT much more efficient, and still waste much more energy than they actually use to make light.
I do wonder therefore about the "green" advice to replace domestic light bulbs with LEDs. These are much more expensive that the old, very cheap, incandescent ones and my experience is the LEDs do not last anywhere near as long as is claimed. So the energy savings may not compensate for the extra expense of buying them.
It'll be interesting to see now long LED bulbs in cars actually last - in particular LED headlights, which by all accounts are VERY expensive to replace.
I do wonder therefore about the "green" advice to replace domestic light bulbs with LEDs. These are much more expensive that the old, very cheap, incandescent ones and my experience is the LEDs do not last anywhere near as long as is claimed. So the energy savings may not compensate for the extra expense of buying them.
It'll be interesting to see now long LED bulbs in cars actually last - in particular LED headlights, which by all accounts are VERY expensive to replace.
#33
05-25-2021, 01:38 PM
LED HEADLAMP
ITEM DESCRIPTION 1 Headlamp mounting bracket 2 LED High Beam Module 3 LED Low Beam Module 4 Bezel 5 Daytime Running Lamp (DRL) and turn signal indicator 6 Electrical connector 7 AdjustersThe LED headlamp has a low and high beam unit. Vertical movement is controlled by an actuator, operated by the BCM/GWM for automatic headlamp Leveling.The LED headlamp is a self contained unit located within the headlamp assembly.
The cooling of the LED control unit allows the warm air to be used for de-icing and demisting the lens of the headlight unit. The cooling of the control unit ensures long life of the LED headlight unit.
The greatest advantage offered by white LEDs lies in the colour of their light, which is also known as the colour temperature. Reaching approximately 6,000° Kelvin the intensity of their light is just about the same as the quality of daylight. When referring to light, Kelvin is a unit of color temperature.
#34
06-27-2023, 01:22 AM
Junior Member
The "noise" is real! Took my XF into Tampa Jag and they gave me another XF while they tried to figure out what's happening. Some mechanics heard it, some did not (shop noise I suspect was a factor). Those who heard it could not explain it. They send an inquiry to JAGUSA and JAGUK but there were no other reports. The fun part, tho, was the XF loaner also had the "noise." Oh well, at least it is documented with them in case of future issues. Suggest others who can hear it also document it with their dealership.
#35
06-27-2023, 11:18 AM
Senior Member
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