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New LED Globes - DIPPED BEAM MALFUNCTION

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Old Aug 1st, 2020, 10:23   #1
Agro
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Question New LED Globes - DIPPED BEAM MALFUNCTION

Just upgraded my crappy halogen globes with some 21W LED H7 Globes I picked up on Ebay. 850 lumens; 6000K Colour.

They are a huge improvement on the stock halogen globes but I get this "Dipped Beam Malfunction" message come up on the dash.

Simple job. Applied some silicon grease to connections to protect form future corrosion is all I did extra.

Any ideas as to why? And How to Fix?

.
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Old Aug 1st, 2020, 11:54   #2
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It's possible that the light circuit monitors the current through the bulb and the LED returns a reading outside of the expected one. I have replaced bulbs with LEDs in other cars and had to wire a resistor in the circuit to get the4 things to work but that was all done with advice from people that knew what they were doing and I'm not included in that group!
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Old Aug 2nd, 2020, 21:08   #3
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Here’s a paragraph from the ABD.co.uk website:

“As LEDs run on a much lower wattage than a standard filament bulb, newer vehicles may experience false 'bulb failure' warning lights on the dashboard. To solve this, many of our bulbs are CAN-Bus compatible, meaning they can communicate with your vehicles ECU. In a small minority of vehicles however, CAN-Bus bulbs may still be incompatible”

This blog item talks about using a resistor to solve the problem:

https://www.autobulbsdirect.co.uk/bl...ts-the-basics/

(I’m not affiliated with ABD, am just a satisfied customer)

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Old Aug 3rd, 2020, 00:42   #4
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That quotation from ABD is rubbish. It's nothing to do with wattage. It's the fact that the failure monitoring circuit cannot see a resistance, normally the bulb, and sees it as a fault. LEDs do not register a resistance that is why a resistor is used and it fools the circuit monitor into seeing a normal circuit and no fault.
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Old Aug 3rd, 2020, 01:39   #5
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Quote:
Originally Posted by Tatsfield View Post
It's possible that the light circuit monitors the current through the bulb and the LED returns a reading outside of the expected one. I have replaced bulbs with LEDs in other cars and had to wire a resistor in the circuit to get the4 things to work but that was all done with advice from people that knew what they were doing and I'm not included in that group!
Quote:
Originally Posted by filbert View Post
Here’s a paragraph from the ABD.co.uk website:

“As LEDs run on a much lower wattage than a standard filament bulb, newer vehicles may experience false 'bulb failure' warning lights on the dashboard. To solve this, many of our bulbs are CAN-Bus compatible, meaning they can communicate with your vehicles ECU. In a small minority of vehicles however, CAN-Bus bulbs may still be incompatible”

This blog item talks about using a resistor to solve the problem:

https://www.autobulbsdirect.co.uk/bl...ts-the-basics/

(I’m not affiliated with ABD, am just a satisfied customer)
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Originally Posted by XC70Virgin View Post
That quotation from ABD is rubbish. It's nothing to do with wattage. It's the fact that the failure monitoring circuit cannot see a resistance, normally the bulb, and sees it as a fault. LEDs do not register a resistance that is why a resistor is used and it fools the circuit monitor into seeing a normal circuit and no fault.

Thanks y'all,

That's what I have since found.

I incorrectly purchased bulbs without CANbus resistors built in, hence the malfunction message. I've ordered correct ones now.

I could also have purchased a CANbus resistor which would fit between my bulb and the vehicle's globe connector that does the same job.

All that aside, they pump out an amazing amount of light. I don't expect my cheapo ebay globes will last as long as a reputable brand name but at <20% of the cost I'm happy to give them a go.

Think I'll also order a resistor and have them fitted to both cars to compare performance.

For anyone who is interested.
These without resistor.

These with resistor.

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Old Aug 3rd, 2020, 07:45   #6
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Quote:
Originally Posted by XC70Virgin View Post
That quotation from ABD is rubbish. It's nothing to do with wattage. It's the fact that the failure monitoring circuit cannot see a resistance, normally the bulb, and sees it as a fault. LEDs do not register a resistance that is why a resistor is used and it fools the circuit monitor into seeing a normal circuit and no fault.
The can bus statement is utter crap - the bulbs cannot and do not communicate with anything. They are dumb devices.

The lower wattage of the bulb means the failure detection circuit detects the bulb as having failed.
Solution is to add a resistor to increase the current draw to something near that of a halogen bulb. Then the bulb failure circuit is happen, and you have a nice hot resistor keeping the engine bay warm, melting plastic and all that good stuff.
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Old Aug 3rd, 2020, 07:46   #7
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Quote:
Originally Posted by filbert View Post
“As LEDs run on a much lower wattage than a standard filament bulb, newer vehicles may experience false 'bulb failure' warning lights on the dashboard. To solve this, many of our bulbs are CAN-Bus compatible, meaning they can communicate with your vehicles ECU. In a small minority of vehicles however, CAN-Bus bulbs may still be incompatible”
Load of crap. Bulbs cannot communicate with ECUs.
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Old Aug 3rd, 2020, 08:27   #8
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Quote:
Originally Posted by SwissXC90 View Post
Solution is to add a resistor to increase the current draw to something near that of a halogen bulb. Then the bulb failure circuit is happen, and you have a nice hot resistor keeping the engine bay warm, melting plastic and all that good stuff.
So it is correct of me to assume that you're saying that adding a resistor is a bad idea? That it's going to get quite hot and could cause damage?
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Old Aug 3rd, 2020, 09:00   #9
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Originally Posted by Agro View Post
So it is correct of me to assume that you're saying that adding a resistor is a bad idea? That it's going to get quite hot and could cause damage?
Very much so...and your headlight lense and reflector were designed for a halogen bulb not a poorly made led that needs elecktrickery to fool the computers.

I doubt that you will improve the throw or pattern of the beam. You only have to look at the boy racers who have done the same and have a haze of light around their headlights blinding oncoming drivers and very little shining on the road.

Buy some quality halogens such as https://www.philips.co.uk/c-p/12972VPB1/visionplus-car-headlight-bulb


Clean your Windows inside

Get booked in for your cataract operation

Wear your spectacles when driving

Try sleeping at night then you won't need your headlights

Last edited by 37 RUBY; Aug 3rd, 2020 at 09:05.
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Old Aug 3rd, 2020, 10:07   #10
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Originally Posted by 37 RUBY View Post
Very much so...and your headlight lense and reflector were designed for a halogen bulb not a poorly made led that needs elecktrickery to fool the computers.

I doubt that you will improve the throw or pattern of the beam. You only have to look at the boy racers who have done the same and have a haze of light around their headlights blinding oncoming drivers and very little shining on the road.
Hmmmmm.

They do improve the throw and pattern of the beam but most importantly, they light up the general area substantially better with a nice bright white light compared to the crappy beige of my standard Volvo halogen globes. I actually had to tip the beam downwards cause I felt sorry for those coming towards me.

Anyway, back to the drawing board then.

I suspect these 21w globes will not get dangerously hot, so anyone know if there will be any issue if I decide to put up with the malfunction message for a while??
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